Search Results for: IPv6

Detecting ECMP in Linux using Paris and Dublin Traceroute

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Post Views: 6,055 Equal-Cost Multi-Path (ECMP) is a forwarding mechanism for routing packets along multiple paths of equal cost with the goal to achieve almost equally distributed link load sharing. This, of course, significantly impacts a router’s next-hop (path) decision. For further details, look at RFC 2991, “Multipath Issues in Unicast and Multicast Next-Hop Selection,” […]

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Linux Starting Point – Commands You Need To Know

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Post Views: 1,527 My recent blog post regarding Linux being the operating system of choice if you are supporting/testing/operating a network has spawned some great discussion.  Emerging the discussion has come a request to write up a starting point list of commands for Linux beginners.  I said “Sure, I can do that!”  I thought it

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Using Wireshark to capture between VirtualBox VM’s

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Post Views: 6,235 Check out these great references as well:   Our custom profiles repository for Wireshark  Our Udemy course on Wireshark   Our Udemy course on Wireless Packet capture A great question and problem. The fundamental answer is you can’t.  Why?  Depends on who you believe.  My conclusion is that Wireshark (really dumpcap) has to use

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GeoIP Add In for Wireshark 2.6 and Later

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Post Views: 1,854 Check out these great references as well:   Our custom profiles repository for Wireshark  Our Udemy course on Wireshark   Our Udemy course on Wireless Packet capture Teaching a Wireshark class with some cellular company employees, I was asked how to integrate the GeoIP IP Address resolution.  I had not done this for years,

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Perhaps a top 15 Wireshark Capture Filter List

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Post Views: 3,781 Check out these great references as well:   Our custom profiles repository for Wireshark  Our Udemy course on Wireshark   Our Udemy course on Wireless Packet capture     Perhaps…. Of course you can edit these with appropriate addresses and numbers. The ones used are just examples.  Unlike Wireshark’s Display Filter syntax, Capture filters

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What is the ‘area range’ command in OSPF?

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Post Views: 1,963 Check out these additional Routing Resources: Our IP Routing course at Udemy Our Custom Profiles for Wireshark Classes at the Online School This is commonly asked question from our routing courses and routing discussions in other courses.  Let’s explain this command in this article. To start, you have to know that OSPF

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What is the “network” Command in OSPF and BGP?

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Post Views: 1,850 Check out these additional Routing Resources: Our IP Routing course at Udemy Our Custom Profiles for Wireshark Classes at the Online School In a recent course on IPv6, one of my students asked what the “network” command did as we were beginning to study the routing commands used in Cisco IOS when

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If I want to get into Networking, what should I learn?

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Post Views: 1,756 I was recently (this was 2017) asked the question “If I want to get into Networking, what should I learn?” If you want to see the 2025 answer – click here. A great question because Telecommunications or Data Networking is really not a degree program at most universities, at least not at

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A List of Network Monitoring Tools for Network and System Administrators

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Post Views: 7,104 Monitoring, analyzing, managing, and diagraming a network can often be a huge problem for Network and System Administrators.  They are often vendor specific or cost large sums of money to license.  We also have the challenge of so many different network infrastructures, like Wi-Fi and wired. If you are looking for a

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