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hreflang="cs" data-title="SLIP" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – German" lang="de" hreflang="de" data-title="Serial Line Internet Protocol" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – Spanish" lang="es" hreflang="es" data-title="Serial Line Internet Protocol" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%82%D8%B1%D8%A7%D8%B1%D8%AF%D8%A7%D8%AF_%D8%A7%DB%8C%D9%86%D8%AA%D8%B1%D9%86%D8%AA_%D8%AE%D8%B7_%D8%B3%D8%B1%DB%8C%D8%A7%D9%84" title="قرارداد اینترنت خط سریال – Persian" lang="fa" hreflang="fa" data-title="قرارداد اینترنت خط سریال" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – French" lang="fr" hreflang="fr" data-title="Serial Line Internet Protocol" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%A7%81%EB%A0%AC_%ED%9A%8C%EC%84%A0_%EC%9D%B8%ED%84%B0%EB%84%B7_%ED%94%84%EB%A1%9C%ED%86%A0%EC%BD%9C" title="직렬 회선 인터넷 프로토콜 – Korean" lang="ko" hreflang="ko" data-title="직렬 회선 인터넷 프로토콜" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – Italian" lang="it" hreflang="it" data-title="Serial Line Internet Protocol" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/SLIP" title="SLIP – Kurdish" lang="ku" hreflang="ku" data-title="SLIP" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/SLIP" title="SLIP – Latvian" lang="lv" hreflang="lv" data-title="SLIP" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – Dutch" lang="nl" hreflang="nl" data-title="Serial Line Internet Protocol" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – Japanese" lang="ja" hreflang="ja" data-title="Serial Line Internet Protocol" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Serial Line Internet Protocol" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – Polish" lang="pl" hreflang="pl" data-title="Serial Line Internet Protocol" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/SLIP" title="SLIP – Russian" lang="ru" hreflang="ru" data-title="SLIP" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Serial_Line_Internet_Protocol" title="Serial Line Internet Protocol – Swedish" lang="sv" hreflang="sv" data-title="Serial Line Internet Protocol" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Serial_Line_IP_(SLIP)" title="Serial Line IP (SLIP) – Turkish" lang="tr" hreflang="tr" data-title="Serial Line IP (SLIP)" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D1%82%D0%BE%D0%BA%D0%BE%D0%BB_%D1%96%D0%BD%D1%82%D0%B5%D1%80%D0%BD%D0%B5%D1%82%D1%83_%D0%B4%D0%BB%D1%8F_%D0%BF%D0%BE%D1%81%D0%BB%D1%96%D0%B4%D0%BE%D0%B2%D0%BD%D0%BE%D1%97_%D0%BB%D1%96%D0%BD%D1%96%D1%97" title="Протокол інтернету для послідовної лінії – Ukrainian" lang="uk" hreflang="uk" data-title="Протокол інтернету для послідовної лінії" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E4%B8%B2%E5%88%97%E7%B7%9A%E8%B7%AF%E7%B6%B2%E9%9A%9B%E7%B6%B2%E8%B7%AF%E5%8D%94%E5%AE%9A" title="串列線路網際網路協定 – Chinese" lang="zh" hreflang="zh" data-title="串列線路網際網路協定" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span 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class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Internet Protocol encapsulation for serial ports and router connections</div> <style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist 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a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><table class="sidebar nomobile nowraplinks hlist"><tbody><tr><th class="sidebar-title"><a href="/wiki/Internet_protocol_suite" title="Internet protocol suite">Internet protocol suite</a></th></tr><tr><th class="sidebar-heading"> <a href="/wiki/Application_layer" title="Application layer">Application layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Border_Gateway_Protocol" title="Border Gateway Protocol">BGP</a></li> <li><a href="/wiki/Dynamic_Host_Configuration_Protocol" title="Dynamic Host Configuration Protocol">DHCP</a> (<a href="/wiki/DHCPv6" title="DHCPv6">v6</a>)</li> <li><a href="/wiki/Domain_Name_System" title="Domain Name System">DNS</a></li> <li><a href="/wiki/File_Transfer_Protocol" title="File Transfer Protocol">FTP</a></li> <li><a href="/wiki/HTTP" title="HTTP">HTTP</a> (<a href="/wiki/HTTP/3" title="HTTP/3">HTTP/3</a>)</li> <li><a href="/wiki/HTTPS" title="HTTPS">HTTPS</a></li> <li><a href="/wiki/Internet_Message_Access_Protocol" title="Internet Message Access Protocol">IMAP</a></li> <li><a href="/wiki/IRC" title="IRC">IRC</a></li> <li><a href="/wiki/Lightweight_Directory_Access_Protocol" title="Lightweight Directory Access Protocol">LDAP</a></li> <li><a href="/wiki/Media_Gateway_Control_Protocol" title="Media Gateway Control Protocol">MGCP</a></li> <li><a href="/wiki/MQTT" title="MQTT">MQTT</a></li> <li><a href="/wiki/Network_News_Transfer_Protocol" title="Network News Transfer Protocol">NNTP</a></li> <li><a href="/wiki/Network_Time_Protocol" title="Network Time Protocol">NTP</a></li> <li><a href="/wiki/Open_Shortest_Path_First" title="Open Shortest Path First">OSPF</a></li> <li><a href="/wiki/Post_Office_Protocol" title="Post Office Protocol">POP</a></li> <li><a href="/wiki/Precision_Time_Protocol" title="Precision Time Protocol">PTP</a></li> <li><a href="/wiki/Open_Network_Computing_Remote_Procedure_Call" class="mw-redirect" title="Open Network Computing Remote Procedure Call">ONC/RPC</a></li> <li><a href="/wiki/Real-time_Transport_Protocol" title="Real-time Transport Protocol">RTP</a></li> <li><a href="/wiki/Real-Time_Streaming_Protocol" title="Real-Time Streaming Protocol">RTSP</a></li> <li><a href="/wiki/Routing_Information_Protocol" title="Routing Information Protocol">RIP</a></li> <li><a href="/wiki/Session_Initiation_Protocol" title="Session Initiation Protocol">SIP</a></li> <li><a href="/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol">SMTP</a></li> <li><a href="/wiki/Simple_Network_Management_Protocol" title="Simple Network Management Protocol">SNMP</a></li> <li><a href="/wiki/Secure_Shell" title="Secure Shell">SSH</a></li> <li><a href="/wiki/Telnet" title="Telnet">Telnet</a></li> <li><a href="/wiki/Transport_Layer_Security" title="Transport Layer Security">TLS/SSL</a></li> <li><a href="/wiki/XMPP" title="XMPP">XMPP</a></li> <li><a href="/wiki/Category:Application_layer_protocols" title="Category:Application layer protocols"><i>more...</i></a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Transport_layer" title="Transport layer">Transport layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Transmission_Control_Protocol" title="Transmission Control Protocol">TCP</a></li> <li><a href="/wiki/User_Datagram_Protocol" title="User Datagram Protocol">UDP</a></li> <li><a href="/wiki/Datagram_Congestion_Control_Protocol" title="Datagram Congestion Control Protocol">DCCP</a></li> <li><a href="/wiki/Stream_Control_Transmission_Protocol" title="Stream Control Transmission Protocol">SCTP</a></li> <li><a href="/wiki/Resource_Reservation_Protocol" title="Resource Reservation Protocol">RSVP</a></li> <li><a href="/wiki/QUIC" title="QUIC">QUIC</a></li> <li><a href="/wiki/Category:Transport_layer_protocols" title="Category:Transport layer protocols"><i>more...</i></a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Internet_layer" title="Internet layer">Internet layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Internet_Protocol" title="Internet Protocol">IP</a> <ul><li><a href="/wiki/IPv4" title="IPv4">v4</a></li> <li><a href="/wiki/IPv6" title="IPv6">v6</a></li></ul></li> <li><a href="/wiki/Internet_Control_Message_Protocol" title="Internet Control Message Protocol">ICMP</a> (<a href="/wiki/ICMPv6" title="ICMPv6">v6</a>)</li> <li><a href="/wiki/Neighbor_Discovery_Protocol" title="Neighbor Discovery Protocol">NDP</a></li> <li><a href="/wiki/Explicit_Congestion_Notification" title="Explicit Congestion Notification">ECN</a></li> <li><a href="/wiki/Internet_Group_Management_Protocol" title="Internet Group Management Protocol">IGMP</a></li> <li><a href="/wiki/IPsec" title="IPsec">IPsec</a></li> <li><a href="/wiki/Category:Internet_layer_protocols" title="Category:Internet layer protocols"><i>more...</i></a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Link_layer" title="Link layer">Link layer</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Address_Resolution_Protocol" title="Address Resolution Protocol">ARP</a></li> <li><a href="/wiki/Tunneling_protocol" title="Tunneling protocol">Tunnels</a></li> <li><a href="/wiki/Point-to-Point_Protocol" title="Point-to-Point Protocol">PPP</a></li> <li><a href="/wiki/Medium_access_control" title="Medium access control">MAC</a></li> <li><a href="/wiki/Category:Link_protocols" title="Category:Link protocols"><i>more...</i></a></li></ul></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Internet_protocol_suite" title="Template:Internet protocol suite"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Internet_protocol_suite" title="Template talk:Internet protocol suite"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Internet_protocol_suite" title="Special:EditPage/Template:Internet protocol suite"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p>The <b>Serial Line Internet Protocol</b> (<b>SLIP</b>)<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> is an <a href="/wiki/Encapsulation_(networking)" title="Encapsulation (networking)">encapsulation</a> of the <a href="/wiki/Internet_Protocol" title="Internet Protocol">Internet Protocol</a><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup> designed to work over <a href="/wiki/Serial_port" title="Serial port">serial ports</a> and <a href="/wiki/Router_(computing)" title="Router (computing)">router</a> connections. It is documented in <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc1055">1055</a>. On personal computers, SLIP has largely been replaced by the <a href="/wiki/Point-to-Point_Protocol" title="Point-to-Point Protocol">Point-to-Point Protocol</a> (PPP), which is better engineered, has more features, and does not require its IP address configuration to be set before it is established. On <a href="/wiki/Microcontrollers" class="mw-redirect" title="Microcontrollers">microcontrollers</a>, however, SLIP is still the preferred way of encapsulating <a href="/wiki/Internet_Protocol" title="Internet Protocol">IP packets</a>, due to its very small overhead. </p><p>Some people refer to the successful and widely used RFC 1055 Serial Line Internet Protocol as "Rick Adams' SLIP",<sup id="cite_ref-rfc1547_4-0" class="reference"><a href="#cite_note-rfc1547-4"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> to avoid confusion with other proposed protocols named "SLIP". Those other protocols include the much more complicated <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc914">914</a> appendix D <a href="/w/index.php?title=Serial_Line_Interface_Protocol&action=edit&redlink=1" class="new" title="Serial Line Interface Protocol (page does not exist)">Serial Line Interface Protocol</a>.<sup id="cite_ref-rfc1547_4-1" class="reference"><a href="#cite_note-rfc1547-4"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Description">Description</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Serial_Line_Internet_Protocol&action=edit&section=1" title="Edit section: Description"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable"> <tbody><tr> <th>Hex value</th> <th>Dec Value</th> <th>Oct Value</th> <th>Abbreviation</th> <th>Description </th></tr> <tr> <td>0xC0</td> <td>192</td> <td>300</td> <td>END</td> <td>Frame End </td></tr> <tr> <td>0xDB</td> <td>219</td> <td>333</td> <td>ESC</td> <td>Frame Escape </td></tr> <tr> <td>0xDC</td> <td>220</td> <td>334</td> <td>ESC_END</td> <td>Transposed Frame End </td></tr> <tr> <td>0xDD</td> <td>221</td> <td>335</td> <td>ESC_ESC</td> <td>Transposed Frame Escape </td></tr></tbody></table> <p>SLIP modifies a standard <a href="/wiki/TCP/IP" class="mw-redirect" title="TCP/IP">TCP/IP</a> <a href="/wiki/Datagram" title="Datagram">datagram</a> by: </p> <ul><li>appending a special "END" <a href="/wiki/Byte" title="Byte">byte</a> to it, which distinguishes datagram boundaries in the byte stream,</li> <li>if the END byte occurs in the data to be sent, the two byte sequence ESC, ESC_END is sent instead,</li> <li>if the ESC byte occurs in the data, the two byte sequence ESC, ESC_ESC is sent.</li> <li>variants of the protocol may begin, as well as end, packets with END.</li></ul> <p>SLIP requires a serial port <a href="/wiki/Computer_configuration" title="Computer configuration">configuration</a> of 8 <a href="/wiki/Data" title="Data">data</a> <a href="/wiki/Bit" title="Bit">bits</a>, no <a href="/wiki/Parity_bit" title="Parity bit">parity</a>, and either <a href="/wiki/Electronic_Industries_Alliance" title="Electronic Industries Alliance">EIA</a> hardware <a href="/wiki/Flow_control_(data)" title="Flow control (data)">flow control</a>, or CLOCAL mode (3-wire <a href="/wiki/Null-modem" class="mw-redirect" title="Null-modem">null-modem</a>) <a href="/wiki/UART" class="mw-redirect" title="UART">UART</a> operation settings. </p><p>SLIP does not provide <a href="/wiki/Error_detection" class="mw-redirect" title="Error detection">error detection</a>, being reliant on <a href="/wiki/Upper_layer_protocol" class="mw-redirect" title="Upper layer protocol">upper layer protocols</a> for this. Therefore, SLIP on its own is not satisfactory over a link which is error-prone, such as a poor quality <a href="/wiki/Dial-up" class="mw-redirect" title="Dial-up">dial-up</a> connection. </p><p>SLIP escape characters were also required on some modem connections to escape <a href="/wiki/Hayes_command_set" class="mw-redirect" title="Hayes command set">Hayes command set</a>, allowing therefore to pass binary data through those modems that would recognize some characters as commands. </p> <div class="mw-heading mw-heading2"><h2 id="CSLIP">CSLIP</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Serial_Line_Internet_Protocol&action=edit&section=2" title="Edit section: CSLIP"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A version of SLIP with <a href="/wiki/Header_(computing)" title="Header (computing)">header</a> <a href="/wiki/Data_compression" title="Data compression">compression</a> is called <b>Compressed SLIP</b> (<b>CSLIP</b>).<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The compression algorithm used in CSLIP is known as <a href="/wiki/Van_Jacobson_TCP/IP_Header_Compression" title="Van Jacobson TCP/IP Header Compression">Van Jacobson TCP/IP Header Compression</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> CSLIP has no effect on the data payload of a packet and is independent of any compression by the serial line modem used for transmission. It reduces the <a href="/wiki/Transmission_Control_Protocol" title="Transmission Control Protocol">Transmission Control Protocol</a> (TCP) header from twenty <a href="/wiki/Byte" title="Byte">bytes</a> to seven bytes. CSLIP has no effect on <a href="/wiki/User_Datagram_Protocol" title="User Datagram Protocol">User Datagram Protocol</a> (UDP) datagrams. </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Serial_Line_Internet_Protocol&action=edit&section=3" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/History_of_the_Internet" title="History of the Internet">History of the Internet</a></div> <p>RFC 1055, a "non-standard" for SLIP, traces its origins to the 3COM UNET TCP/IP implementation from the 1980s. Rick Adams added SLIP to the popular <a href="/wiki/4.2BSD" class="mw-redirect" title="4.2BSD">4.2BSD</a> in 1984 and it "quickly caught on". By the time of the RFC (1988), it is described as "commonly used on dedicated serial links and sometimes for dialup purposes".<sup id="cite_ref-rfc1055_7-0" class="reference"><a href="#cite_note-rfc1055-7"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p><p>The last version of FreeBSD to include "slattach" (a command for connecting to slip) in the manual database is FreeBSD 7.4, released 2011. The manual claims that auto-negotiation exists for CSLIP. The FreeBSD version is inherited from 4.3BSD.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>Linux formerly used the same code base for SLIP and <a href="/wiki/KISS_(TNC)" class="mw-redirect" title="KISS (TNC)">KISS (TNC)</a>. The split occurred before the start of kernel git history (Linux-2.6.12-rc2, 2005).<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> The SLIP driver offers a special "6-bit" escaped mode to accommodate modems incapable of handling non-ASCII characters.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> The Linux slattach command (written independently) also has the ability to auto-detect CSLIP support.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Serial_Line_Internet_Protocol&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Parallel_Line_Internet_Protocol" title="Parallel Line Internet Protocol">Parallel Line Internet Protocol</a></li> <li><a href="/wiki/Slirp" title="Slirp">Slirp</a></li> <li><a href="/wiki/KA9Q" title="KA9Q">KA9Q</a></li> <li><a href="/wiki/Direct_cable_connection" title="Direct cable connection">Direct cable connection</a></li> <li><a href="/wiki/In-band_signaling" title="In-band signaling">In-band signaling</a></li> <li><a href="/wiki/KISS_(amateur_radio_protocol)" title="KISS (amateur radio protocol)">KISS (amateur radio protocol)</a></li> <li><a href="/wiki/Consistent_Overhead_Byte_Stuffing" title="Consistent Overhead Byte Stuffing">Consistent Overhead Byte Stuffing</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Serial_Line_Internet_Protocol&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-lower-alpha"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">SLIP does not actually care about the internal structures of IP: any <a href="/wiki/Network_layer" title="Network layer">network layer</a> protocols can be sent over the wire.</span> </li> </ol></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="http://www.nytimes.com/library/cyber/qa/0531freed.html">"Internet Q&A"</a>. <i><a href="/wiki/The_New_York_Times" title="The New York Times">The New York Times</a></i>. May 31, 1996.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+New+York+Times&rft.atitle=Internet+Q%26A&rft.date=1996-05-31&rft_id=http%3A%2F%2Fwww.nytimes.com%2Flibrary%2Fcyber%2Fqa%2F0531freed.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://www.nytimes.com/1994/05/08/business/the-executive-computer-for-befuddled-newcomers-easier-access-to-the-internet.html">"The Executive Computer; For Befuddled Newcomers, Easier Access"</a>. <i><a href="/wiki/The_New_York_Times" title="The New York Times">The New York Times</a></i>. May 8, 1994.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+New+York+Times&rft.atitle=The+Executive+Computer%3B+For+Befuddled+Newcomers%2C+Easier+Access&rft.date=1994-05-08&rft_id=https%3A%2F%2Fwww.nytimes.com%2F1994%2F05%2F08%2Fbusiness%2Fthe-executive-computer-for-befuddled-newcomers-easier-access-to-the-internet.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span></span> </li> <li id="cite_note-rfc1547-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-rfc1547_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-rfc1547_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc1547">1547</a>: "Requirements for an Internet Standard Point-to-Point Protocol" </span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://www.oreilly.com/library/view/understanding-tcpip/9781904811718/ch04s02.html"><i>Understanding TCP/IP (Chapter 4.2 Compressed SLIP)</i></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Understanding+TCP%2FIP+%28Chapter+4.2+Compressed+SLIP%29&rft_id=https%3A%2F%2Fwww.oreilly.com%2Flibrary%2Fview%2Funderstanding-tcpip%2F9781904811718%2Fch04s02.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJacobson1990" class="citation web cs1">Jacobson, V. (February 1990). <a rel="nofollow" class="external text" href="http://tools.ietf.org/html/rfc1144">"Compressing TCP/IP Headers for Low-Speed Serial Links"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Compressing+TCP%2FIP+Headers+for+Low-Speed+Serial+Links&rft.date=1990-02&rft.aulast=Jacobson&rft.aufirst=V.&rft_id=http%3A%2F%2Ftools.ietf.org%2Fhtml%2Frfc1144&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span> — introduced the <a href="/wiki/Van_Jacobson_TCP/IP_Header_Compression" title="Van Jacobson TCP/IP Header Compression">Van Jacobson TCP/IP Header Compression</a> used by CSLIP</span> </li> <li id="cite_note-rfc1055-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-rfc1055_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc1055">"RFC 1055: Nonstandard for transmission of IP datagrams over serial lines: SLIP"</a>. <i>IETF Datatracker</i>. 1 June 1988.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=IETF+Datatracker&rft.atitle=RFC+1055%3A+Nonstandard+for+transmission+of+IP+datagrams+over+serial+lines%3A+SLIP&rft.date=1988-06-01&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc1055&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://man.freebsd.org/cgi/man.cgi?query=slip&apropos=0&sektion=8&manpath=FreeBSD+7.4-RELEASE&arch=default&format=html">"slattach(8)"</a>. <i>man.freebsd.org</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=man.freebsd.org&rft.atitle=slattach%288%29&rft_id=https%3A%2F%2Fman.freebsd.org%2Fcgi%2Fman.cgi%3Fquery%3Dslip%26apropos%3D0%26sektion%3D8%26manpath%3DFreeBSD%2B7.4-RELEASE%26arch%3Ddefault%26format%3Dhtml&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFTorvalds2023" class="citation web cs1">Torvalds, Linus (13 May 2023). <a rel="nofollow" class="external text" href="https://github.com/torvalds/linux/blob/9a48d604672220545d209e9996c2a1edbb5637f6/drivers/net/hamradio/mkiss.c">"History for mkiss.c"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">13 May</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=History+for+mkiss.c&rft.date=2023-05-13&rft.aulast=Torvalds&rft.aufirst=Linus&rft_id=https%3A%2F%2Fgithub.com%2Ftorvalds%2Flinux%2Fblob%2F9a48d604672220545d209e9996c2a1edbb5637f6%2Fdrivers%2Fnet%2Fhamradio%2Fmkiss.c&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFTorvalds2023" class="citation web cs1">Torvalds, Linus (13 May 2023). <a rel="nofollow" class="external text" href="https://github.com/torvalds/linux/blob/master/drivers/net/slip/Kconfig">"drivers/net/slip/Kconfig"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=drivers%2Fnet%2Fslip%2FKconfig&rft.date=2023-05-13&rft.aulast=Torvalds&rft.aufirst=Linus&rft_id=https%3A%2F%2Fgithub.com%2Ftorvalds%2Flinux%2Fblob%2Fmaster%2Fdrivers%2Fnet%2Fslip%2FKconfig&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASerial+Line+Internet+Protocol" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><span class="plainlinksneverexpand"><code><a rel="nofollow" class="external text" href="https://manned.org/slattach.8">slattach(8)</a></code></span> – <a href="/wiki/Linux" title="Linux">Linux</a> Programmer's <a href="/wiki/Man_page" title="Man page">Manual</a> – Administration and Privileged Commands "Other possible values are slip (normal SLIP), adaptive (adaptive CSLIP/SLIP)...</span> </li> </ol></div></div> <div class="navbox-styles"><link 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