Post Views: 5,594 How does my traffic to a site on the Internet get there? What path did it follow? These are great questions, and I will attempt to answer them in this article. When you’re on the Internet, information or requests sent from your computer don’t reach the destination computer in a single jump […]
Using Traceroute to Determine Paths Through the Internet Read More »
Post Views: 8,113 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,”
Detecting ECMP in Linux using Paris and Dublin Traceroute Read More »
Post Views: 2,542 Since we published the Linux Networking Commands article in October 2017, I have had several comments that I should have included the “My Trace Route” command. Ofcourse, readers were correct, but I felt that this tool deserved its own article. Some of you, depending on what version of Linux you use may
My Traceroute in Linux Read More »
Post Views: 4,644 The Internet error reporting protocol is the Internet Control Message Protocol – ICMP. ICMP has changed over the years. This ICMP profile is specifically tuned for looking at Traceroute captures. With additional ICMP focused columns and better colors (no errors should be green): Further, with filters buttons for all the various ICMP
An ICMP for Traceroute Analysis in IPv4 Networks Profile Read More »
Post Views: 2,914 This How To explaing how to use Extended Ping and Extended Traceroute options in Cisco IOS. Extended Ping The ping command is just about as simple as it gets when it comes to troubleshooting. Ping is actually ICMP. ICMP sends a encho request to a particular address and, if present, that device
Extended Ping and Extended Traceroute Usage in Cisco IOS Read More »
Post Views: 4,241 This one is short and sweet. Is your traceroute responding with “* * *”, or did you enter 1000000000 for the number of extended pings? Easy – simply type CTRL-SHIFT-6 to break the process. That is the Control Key (hold down), the Shift Key (also hold down) and the “6” key –
Stopping PING or TRACEROUTE on Cisco IOS Routers Read More »
Post Views: 9,382 A Practical Introduction to Ethernet, TCP/IP, Addressing, Routing, and Network Troubleshooting 1-Day, Instructor Led, Web Based Delivery or Self Paced, OnlineMinimum: 10 StudentsWeb Based Delivery: Max class size is 30On Site Delivery: Max class size is 20 Click here to go to the Online Class. What Students are Saying about this class: Course
CSI-SP-007 – Networking 101 for Technicians Read More »
Post Views: 3,467 Check out these additional IPv6 Resources Our IPv6 overview course at Udemy Our IPv6 Custom Profiles for Wireshark Our IPv6 classes at the Online School OK folks, based on some feedback from Reddit, I decided to update this post from 2013. Modern Linux distributions have largely deprecated the legacy net-tools suite (which
IPv6 Linux Command Line Examples Read More »
Post Views: 9,512 Here’s a solid toolbox of Windows PowerShell commands used for network troubleshooting, with quick notes on what each one is good for. I’ll try to group them by task so they are a little easier to remember. 1. Basic Connectivity & “Ping-Style” Tests Test-Connection PowerShell’s ping (ICMP echo) equivalent. Test-NetConnection More advanced
PowerShell Commands Used for Network Troubleshooting Read More »
Post Views: 2,323 I get asked this question all the time. It is indeed a great question. I previously posted an answer to this FAQ in 2017 – you can look at that here. I often point folks who ask to that post, but they claim it is ancient history. But is it? So I
If I want to get into Networking, what should I learn in 2025? Read More »
