{"id":1286,"date":"2008-11-17T09:00:53","date_gmt":"2008-11-17T09:00:53","guid":{"rendered":"http:\/\/www.markwilson.co.uk\/blog\/2008\/11\/free-wireshark-training-and-the-10-truths-of-network-analysis.htm"},"modified":"2008-11-17T09:01:11","modified_gmt":"2008-11-17T09:01:11","slug":"free-wireshark-training-and-the-10-truths-of-network-analysis","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2008\/11\/free-wireshark-training-and-the-10-truths-of-network-analysis.htm","title":{"rendered":"Free Wireshark training &#8211; and the 10 truths of network analysis"},"content":{"rendered":"<p>Last week, I was working my way through my RSS backlog when I spotted <a href=\"http:\/\/tfl09.blogspot.com\/2008\/11\/network-protocol-training.html\">Thomas Lee&#8217;s post highlighting some free Wireshark (formerly Ethereal) webcasts<\/a> by <a href=\"http:\/\/new.networkprotocolspecialists.com\/\">Network Protocol Specialists<\/a>.<\/p>\n<p><a href=\"http:\/\/www.wireshark.org\/\">Wireshark<\/a> is an open source packet capture and analysis tool (a bit like <a href=\"http:\/\/blogs.technet.com\/netmon\/\">Microsoft Network Monitor<\/a> &#8211; but available for a variety of platforms as well as in <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2007\/02\/portable-applications-alternative.htm\">portable application<\/a> and U3 form).  I&#8217;ve struggled with deep packet-level networking since my days at Uni&#8217; but a little knowledge in this area can really help when troubleshooting connectivity, so I registered for the first session and found it both worthwhile and interesting as Mike Pennacchi explained:<\/p>\n<ul>\n<li>Analyzer placement.<\/li>\n<li>Starting up Wireshark.<\/li>\n<li>Selecting an interface.<\/li>\n<li>Basic capture filters.<\/li>\n<li>Capturing packets.<\/li>\n<li>Displaying and decoding packets.<\/li>\n<li>Saving the trace.<\/li>\n<\/ul>\n<p>The next two sessions will look at:<\/p>\n<ul>\n<li>Using display filters effectively.<\/li>\n<li>Long term captures.<\/li>\n<\/ul>\n<p>and:<\/p>\n<ul>\n<li>Separating the good traffic from the bad traffic.<\/li>\n<\/ul>\n<p>If you want to know more, <a href=\"http:\/\/new.networkprotocolspecialists.com\/downloads\/WSQuickStart_1.wmv\">check out the video from session 1<\/a> &#8211; or <a href=\"http:\/\/new.networkprotocolspecialists.com\/training\/\">register for the next two sessions<\/a> on the Network Protocol Specialists website.<\/p>\n<p>In the meantime, I&#8217;ll round up this post with Mike&#8217;s 10 truths of network analysis:<\/p>\n<ol>\n<li>The wire does not lie.  It is not out to prove a point, nor is it politically motivated.  Interpreting traffic on the wire can help to solve problems.<\/li>\n<li>Packets cannot hang around at a device for more than a few milliseconds.  Routers and switches do not have large enough buffers for packets  to &#8220;hang around&#8221; &#8211; they may get dropped and retransmitted &#8211; or an application may be holding on to them.  Network analysis can help to identify where the delay is.<\/li>\n<li>The total response time is the sum of the various deltas. Long response times may be the result of many packets with small gaps or fewer packets with long gaps.<\/li>\n<li>Every application program can be diagnosed.  Solving them is a different issue.<\/li>\n<li>Focus on eliminating components that are not part of the problem.  Figure out which layer of the OSI model is causing the problem, then implicate or exonerate.<\/li>\n<li>Don&#8217;t guess.  Only state the facts after thorough analysis.<\/li>\n<li>Don&#8217;t believe anything that anyone tells you.  Carry out your own troubleshooting and analysis.  Be thorough.<\/li>\n<li>Explain the problem and diagnosis in a way that can be understood by all.  Avoid misinterpretation and misunderstanding.<\/li>\n<li>Understand how to use the analysis tools before problems occur. And practice!<\/li>\n<li>Look for differences between working and non-working examples.  If the normal situation is captured then it&#8217;s like a digital photo for comparison.\n<\/li>\n<\/ol>\n<p>And finally, if this sort of thing is what interests you, Network Protocol Specialists have created a <a href=\"http:\/\/www.linkedin.com\/groups?gid=1116847\">LinkedIn group for protocol analysis and troubleshooting<\/a> to provide tips, tricks and valuable information to network professionals, application developers and anyone tasked solving computer network problems.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Last week, I was working my way through my RSS backlog when I spotted Thomas Lee&#8217;s post highlighting some free Wireshark (formerly Ethereal) webcasts by Network Protocol Specialists. Wireshark is an open source packet capture and analysis tool (a bit like Microsoft Network Monitor &#8211; but available for a variety of platforms as well as &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2008\/11\/free-wireshark-training-and-the-10-truths-of-network-analysis.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Free Wireshark training &#8211; and the 10 truths of network analysis<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[22,179],"class_list":["post-1286","post","type-post","status-publish","format-standard","hentry","tag-networks","tag-wireshark"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Free Wireshark training - and the 10 truths of network analysis - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2008\/11\/free-wireshark-training-and-the-10-truths-of-network-analysis.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Free Wireshark training - and the 10 truths of network analysis - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"Last week, I was working my way through my RSS backlog when I spotted Thomas Lee&#8217;s post highlighting some free Wireshark (formerly Ethereal) webcasts by Network Protocol Specialists. Wireshark is an open source packet capture and analysis tool (a bit like Microsoft Network Monitor &#8211; but available for a variety of platforms as well as &hellip; Continue reading Free Wireshark training &#8211; and the 10 truths of network analysis\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2008\/11\/free-wireshark-training-and-the-10-truths-of-network-analysis.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2008-11-17T09:00:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2008-11-17T09:01:11+00:00\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2008\\\/11\\\/free-wireshark-training-and-the-10-truths-of-network-analysis.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2008\\\/11\\\/free-wireshark-training-and-the-10-truths-of-network-analysis.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"Free Wireshark training &#8211; 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Well, funnily enough, I want to do the same thing... and it turns out to be remarkably easy - at least\u2026","rel":"","context":"In \"Telephony\"","block_context":{"text":"Telephony","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/telephony"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":5723,"url":"https:\/\/www.markwilson.co.uk\/blog\/2015\/07\/turning-to-a-pal-when-troubleshooting-exchange.htm","url_meta":{"origin":1286,"position":2},"title":"Turning to a PAL when troubleshooting Exchange&#8230;","author":"Mark Wilson","date":"Tuesday 21 July 2015","format":false,"excerpt":"I recently found myself working with a customer to troubleshoot issues with their Exchange Servers. The servers were losing contact with each other periodically and then doing what Exchange is designed to do in this circumstance, failing databases over to other servers. Unfortunately, whilst I'm not going to go into\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1262,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/11\/useful-links-november-2008.htm","url_meta":{"origin":1286,"position":3},"title":"Useful Links: November 2008","author":"Mark Wilson","date":"Sunday 30 November 2008","format":false,"excerpt":"A list of items I've come across recently that I found potentially useful, interesting, or just plain funny: Microsoft Offline Virtual Machine Servicing Tool v2.0 - Updated with support for Hyper-V, System Center Virtual Machine Manager 2008 and Windows Server 2008 (as well as System Center Configuration Manager 2007 SP1\u2026","rel":"","context":"In \"Useful Websites\"","block_context":{"text":"Useful Websites","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/useful-websites"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1815,"url":"https:\/\/www.markwilson.co.uk\/blog\/2010\/05\/configuring-a-cisco-ip-phone-for-voip-using-sip-revisited.htm","url_meta":{"origin":1286,"position":4},"title":"Configuring a Cisco IP phone for VoIP using SIP &#8211; revisited","author":"Mark Wilson","date":"Friday 14 May 2010","format":false,"excerpt":"A couple of years ago, I blogged about getting my Cisco 7940G IP Phone working with SIP firmware and an external VoIP provider (in my case, it was Sipgate).\u00a0 I also wanted to get a couple more Cisco IP Phones working - the Cisco IP Communicator softphone and a 7911G\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/www.markwilson.co.uk\/blog\/topic\/technology"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1119,"url":"https:\/\/www.markwilson.co.uk\/blog\/2008\/07\/using-packet-level-drivers-for-ms-dos-network-connectivity.htm","url_meta":{"origin":1286,"position":5},"title":"Using packet level drivers for MS-DOS network connectivity","author":"Mark Wilson","date":"Thursday 17 July 2008","format":false,"excerpt":"One of the reasons to use Windows PE for operating system deployment is that it's built on a modern version of Windows so, at least in theory, driver support is less of an issue than it would be using MS-DOS boot disks. Even so, there are still times when a\u2026","rel":"","context":"In \"Microsoft DOS (MS-DOS)\"","block_context":{"text":"Microsoft DOS (MS-DOS)","link":"https:\/\/www.markwilson.co.uk\/blog\/tag\/ms-dos"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=1286"}],"version-history":[{"count":0,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/posts\/1286\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=1286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=1286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markwilson.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=1286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}