Configure Packet Capture to Optimize Performance on a Wireless Access Point

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This feature is very useful for troubleshooting or performance optimization since the captured packets can then be analyzed by a network protocol analyzer .There are two methods of packet capture:</p> <ul> <li style="margin-left: 40px;">Local capture method — Captured packets are stored in a file on the WAP. The WAP can also send the file to a Trivial File Transport Protocol (TFTP) server. The file Administration Packet Capture is formatted in pcap format and can be examined using packet analyzer software tools such as Wireshark and OmniPeek.</li> <li style="margin-left: 40px;">Remote capture method — Captured packets are redirected in real time to an external computer running the Wireshark tool.</li> </ul> <p style="margin-left: 40px">This article aims to guide you on configuring Packet Capture on a WAP and receive these packet captures locally or remotely. Once this is done, you can proceed with checking the <a href="#status">packet capture status</a> and then <a href="#download">download the file</a>.</p> <h2 style="margin-left: 20px">Applicable Devices</h2> <ul> <li style="margin-left: 40px;">Wireless Access Points</li> </ul> <h2 style="margin-left: 20px">Software Version</h2> <ul> <li style="margin-left: 40px;">1.0.1.2 — WAP150, WAP361</li> <li style="margin-left: 40px;">1.0.2.2  — WAP351, WAP131</li> <li style="margin-left: 40px;">1.0.6.2  — WAP121, WAP321</li> <li style="margin-left: 40px;">1.2.1.3 — WAP371, WAP551, WAP561</li> <li style="margin-left: 40px;">1.0.0.17  — WAP571, WAP571E</li> </ul> <h2 style="margin-left: 20px">Configure Packet Capture</h2> <p style="margin-left: 40px"><b>Configure Packet Capture Settings</b></p> <p style="margin-left: 40px">Step 1. Log in to the web-based utility of your access point and choose <b>Administration > Packet Capture</b>.</p> <p style="margin-left: 40px"><b>Note:</b> The tabs may vary depending on the WAP model you are using. The images below are taken from WAP361.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step1.png" style="width: 174px; height: 273px;"/></p> <p style="margin-left: 40px">Step 2. Verify if the <b>Enable</b> check box in Capture Beacons is checked. Beacon frames are transmitted periodically to announce the presence of a Wireless Local Area Network (WLAN). This feature is enabled by default.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step2.png" style="width: 335px; height: 261px;"/></p> <p style="margin-left: 40px"><b>Note</b>: TheWAP551 and WAP561 capture three types of packets: packets associated to the wireless LAN, Ethernet LAN, and packets to internal interfaces.</p> <p style="margin-left: 40px">Step 3. (Optional) If you want to enable a wireless Network Interface Card (NIC) to capture packets associated with a WAP, check the <b>Enable</b> check box of Promiscuous Capture. If you check this, skip to <a href="#step6">Step 6.</a></p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step3.png" style="width: 327px; height: 255px;"/></p> <p style="margin-left: 40px"><b>Note:</b> Either the Promiscuous Capture or Radio Client Filter feature can be enabled.</p> <p style="margin-left: 40px">Step 4. (Optional) If you did not check Promiscuous Capture and wish to enable a wireless NIC to capture packets without the need to associate with a WAP, check the <b>Enable</b> check box of Radio Client Filter.  </p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step4.png" style="width: 327px; height: 300px;"/></p> <p style="margin-left: 40px">Step 5. (Optional) If Radio Client Filter is enabled, enter the MAC address of the client filter in the <i>Client Filter MAC Address</i> field.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step5.png" style="width: 329px; height: 299px;"/></p> <p style="margin-left: 40px"><a id="step6" name="step6">Step 6</a>. Choose one of the following Packet Capture Method radio buttons below:</p> <ul> <li style="margin-left: 40px;">Local File — Stores the captured packets as a file on the WAP. If this option is chosen, proceed to the next step.</li> <li style="margin-left: 40px;">Remote — Redirects the captured packets in real time to an external computer that runs the network protocol analyzer tools. If this option is chosen, proceed to <a href="#step10">Step 10</a>.</li> </ul> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step6.png" style="width: 348px; height: 261px;"/></p> <p style="margin-left: 40px">Step 7. (Optional) If Local File capture method is chosen, choose the interface for which the packets are to be captured from the Capture Interface drop-down list. The list of options may vary depending on the WAP model you are using.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step7.png" style="width: 286px; height: 212px;"/></p> <ul> <li style="margin-left: 40px;">Radio 1/Radio 2 — 802.11 traffic on the radio interface</li> <li style="margin-left: 40px;">Ethernet/eth0 — 802.3 traffic on the Ethernet port</li> <li style="margin-left: 40px;">Radio 1 - VAP0/Radio 2 - VAP0 — VAP0 traffic</li> <li style="margin-left: 40px;">Radio 1 - VAP1 to Radio 1 - VAP3 (if configured) — Traffic on the specified Virtual Access Point (VAP)</li> <li style="margin-left: 40px;">Radio 2 - VAP1 to Radio 2 - VAP3 (if configured) — Traffic on the specified VAP</li> <li style="margin-left: 40px;">Radio 1 - WDS0 to Radio 1 - WDS3 (if configured) — Traffic on the specified Wireless Distribution System (WDS)</li> <li style="margin-left: 40px;">Radio 2 - WDS0 to Radio 2 - WDS3 (if configured) — Traffic on the specified WDS</li> <li style="margin-left: 40px;">LAN1 to LAN5 — 802.3 traffic on the Ethernet port</li> <li style="margin-left: 40px;">Brtrunk — Linux bridge interface in the WAP device.</li> <li style="margin-left: 40px;">wlan0vap1 to wlan0vap7 — Traffic on the specified VAP on Radio 1</li> <li style="margin-left: 40px;">wlan1vap1 to wlan1vap 7 — Traffic on the specified VAP on Radio 2</li> <li style="margin-left: 40px;">wlan0wds0 to wlan0wds3 — Traffic on the specified WDS interface</li> <li style="margin-left: 40px;">VAP0 or WLAN0:VAP0 — VAP0 traffic</li> <li style="margin-left: 40px;">WLAN1:VAP0 — VAP0 traffic on Radio 2 (for WAP561 devices only)</li> <li style="margin-left: 40px;">wlan1 — VAP0 traffic on Radio 2</li> <li style="margin-left: 40px;">Radio 1 - VAP1 to Radio 1 - VAP7 (if configured) — Traffic on the specified VAP</li> <li style="margin-left: 40px;">Radio 2 - VAP1 to Radio 2 - VAP7 (if configured) — Traffic on the specified VAP</li> </ul> <p style="margin-left: 40px">Step 8. Enter the capture duration ranging from 10 to 3600 seconds in the <i>Capture Duration</i> field. The default value is 60 seconds.</p> <p style="margin-left: 40px"><b>Note:</b> In this example, 65 is used.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step8.png" style="width: 542px; height: 187px;"/></p> <p style="margin-left: 40px">Step 9. Enter the maximum capture file size ranging from 64 to 4096 KB in the <i>Maximum Capture File Size</i> field. The default value is 1024 KB.</p> <p style="margin-left: 40px"><b>Note:</b> In this example, 2048 is used.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step9.png" style="width: 534px; height: 187px;"/></p> <p style="margin-left: 40px"><a id="step10" name="step10">Step 10</a>. (Optional) If Remote packet capture method is chosen, enter the port number ranging from 1 to 65530 in the <i>Remote Capture Port </i>field. The default value is 2002.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step10.png" style="width: 341px; height: 264px;"/></p> <p style="margin-left: 40px">Step 11. Click <b>Save</b>.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step11.png" style="width: 343px; height: 264px;"/></p> <p style="margin-left: 40px">Step 12. Click <b>Start Capture</b> to initiate the packet capture process.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step12.png" style="width: 343px; height: 262px;"/></p> <p style="margin-left: 40px">Step 13. Once the confirmation window pops up, click <b>OK</b>.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturesettings-step13.png" style="width: 455px; height: 141px;"/></p> <p style="margin-left: 40px"><b>Note: </b>The <i>Packet Capture Status</i> area will show that capture is in progress.</p> <p style="margin-left: 40px">Step 14. (Optional) Click <b>Stop Capture</b> to stop the packet capture process then click <b>OK</b>.</p> <p style="margin-left: 40px">You have now configured the Packet Capture settings.</p> <h3 style="margin-left: 30px"><a id="status" name="status">Packet Capture Status</a></h3> <p style="margin-left: 40px">The <i>Packet Capture Status</i> area contains the following information. Click <b>Refresh</b> to view the recent status.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-packetcapturestatuss.png" style="width: 383px; height: 177px;"/></p> <ul> <li style="margin-left: 40px;">Current Capture Status — Displays the current packet capture status.</li> <li style="margin-left: 40px;">Packet Capture Time — Displays the duration for which the packets are captured.</li> <li style="margin-left: 40px;">Packet Capture File Size — Displays the size of the packet captured file.</li> </ul> <h3 style="margin-left: 30px"><a id="download" name="download">Packet Capture File Download</a> </h3> <p style="margin-left: 40px">There are two ways on how to download the packet capture file.</p> <ul> <li style="margin-left: 40px;">Hypertext Transfer Protocol (HTTP)</li> <li style="margin-left: 40px;">Trivial File Transfer Protocol (TFTP)</li> </ul> <p style="margin-left: 40px">Step 1. (Optional) If the captured file has to be downloaded through a TFTP server, check the<b> Use TFTP to download the capture file</b> check box. Once checked, the TFTP Server Filename and TFTP Server IPv4 Address fields will activate.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-download-step1.png" style="width: 520px; height: 194px;"/></p> <p style="margin-left: 40px"><b>Note</b>: If you did not check the check box in Step 1, skip to <a href="#step4">Step 4.</a></p> <p style="margin-left: 40px">Step 2. Enter the file name in pcap format in the <i>TFTP Server Filename</i> field ranging from 1 to 256 characters.</p> <p style="margin-left: 40px"><b>Note</b>: In this example, apcapture.pcap is used.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-download-step2.png" style="width: 517px; height: 207px;"/></p> <p style="margin-left: 40px">Step 3. Enter the IPv4 address of the TFTP server in the TFTP Server IPv4 Address field.</p> <p style="margin-left: 40px"><b>Note</b>: In this example, 192.168.1.17 is used.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-download-step3.png" style="width: 516px; height: 209px;"/></p> <p style="margin-left: 40px"><a id="step4" name="step4">Step 4</a>. Click <b>Download</b>. </p> <p style="margin-left: 40px"><b>Note:</b> If you did not choose TFTP, the file is downloaded through HTTP/HTTPS.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-download-step4.png" style="width: 490px; height: 205px;"/></p> <p style="margin-left: 40px">Step 5. A window appears to inform you that the download is in progress. Click <b>OK</b>.</p> <p style="margin-left: 40px"><img alt="" src="/c/dam/en/us/support/docs/smb/wireless/cisco-small-business-100-series-wireless-access-points/images/rjs-8182016-download-step5.png" style="width: 491px; height: 137px;"/></p> <p style="margin-left: 40px">You should now have downloaded your Packet Capture file through HTTP/HTTPS or TFTP.</p> </body> </html> <cdc:do action="com.cisco.wem.framework.service.command.eotcontent.EOTResponsiveContent@7b0abedb" returnTypedAs="eotResponsiveContainerVo" id="eotResponsiveContainerVo" /> <div class="row full visitedlinks" style="padding: 0px; margin:0px"> <div class="col full" >  <div id="eot-revision-history"> <h3>Revision History</h3> <div style="overflow-x: auto;"> <table border="1" id="erh-table"> <tbody> <tr> <th>Revision</th> <th>Publish Date</th> <th>Comments</th> </tr>  <tr class="published"> <td><div align="center">1.0</div></td> <td><div align="center">13-Dec-2018</div></td> <td><div align="left">Initial Release</div></td> </tr> </tbody> </table> </div> </div> </div> </div> </div> <script> if (window.cdc === undefined) { cdc = {}; } if (cdc.eot === undefined) { cdc.eot = {}; } cdc.eot.isEot = true; cdc.eot.isToc = false; jQuery(document).ready(function () { if (jQuery('.unpublished').length > 0) { let lastRel = "1.0"; if (jQuery('.published').length > 0) { lastRel = Number(jQuery('.published td')[0].innerText) + 1 + ".0"; } jQuery('.preview_revision').text(lastRel); } const linkItemsLen = jQuery("#eot-doc-wrapper link[rel='stylesheet']").length; function addNewTocStyleSheet() { const fileName = "/etc/designs/cdc/transformation/wemdcmt_responsive.css", linkElement = `<link rel="stylesheet" href="" type="text/css" />`; document.head.append(linkElement); } if (cdc.eot.isToc && !linkItemsLen) { addNewTocStyleSheet(); } else if (cdc.eot.isEot) { jQuery("#eot-doc-wrapper link[rel='stylesheet']").each(function () { const linkTag = jQuery(this), hrefVal = jQuery(linkTag).attr("href"); if (hrefVal != undefined && hrefVal.indexOf("support-responsive.css") == -1 && hrefVal.indexOf("_responsive.css") == -1) { let fileName = hrefVal.substr(hrefVal.lastIndexOf("/") + 1, hrefVal.length).split(".css")[0]; const filePath = "/etc/designs/cdc/transformation/"; if (fileName == "ccimr") { fileName = "techdocs_responsive"; } else if (fileName == "support-docs") { fileName = "support-responsive"; } else if (fileName == "framework") { fileName = "responsiveframework"; } else if (fileName == "dcmt") { fileName = "wemdcmt_responsive"; } else if (fileName == "techdocs_85_11_word") { fileName = "techdocs_85_11_word"; if (cdc.eot.isToc) { addNewTocStyleSheet(); } } else { fileName += "_responsive"; } jQuery(linkTag).attr("href", filePath + fileName + ".css"); } if (hrefVal.indexOf("support-responsive.css") > -1) { jQuery(linkTag).attr("href", "/etc/designs/cdc/transformation/support-responsive.css"); } }); jQuery("#eot-doc-wrapper > table").wrap("<div></div>"); jQuery("#eot-doc-wrapper table:not('.olh_note')").parent().css({ overflowX: "auto" }); } }); </script> </div> <div class="col narrow-v2"> <div class="rightRailComponent base-blowout"> <div class="eotPersonalization"> <section id="eotSupportCampaign"></section> </div>   <div class="hideComponent"> <div class="tac-image"> <script type="text/javascript"> document.getElementsByClassName('tac-image')[0].parentElement.style.display="none"; </script> </div> </div> <div class="hideComponent"> <div class="eot-authors"> <ul> </ul> </div> </div>  <div class="eot-feedback-container"> <div class="eot-feedback"> <h3>Was this Document Helpful?</h3> <span class="eot-feedback-btnwrap"> <button class="eot-feedback-btn eot-feedback-btn-yes" aria-label="Was this Document Helpful?? 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Configure Packet Capture to Optimize Performance on a Wireless Access Point - Cisco