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Ever thought you were having Layer 4 connectivity issues? Pings as you should know are ICMP transmissions and ICMP is a Layer 3 protocol (commonly used to send error messages). Luckily Cisco has a hidden ( as in it wont show up when using IOS help ) utility for testing TCP connectivity.
The command, [...]
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So, I purchased a couple extra routers, and a second layer3 switch from @usedciscoguy. He gave me a really good deal and I plan on purchasing a 6500 series switch from him as soon as I can afford it. Anyway…. I’ve spent a little bit of time working on a new topology that should allow [...]
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One of the things I used to deploy frequently at my previous position was transport for other ISPs and businesses. Since MPLS support is in its infancy on the Imagestream platform, and was yet to be deployed at the time, this is what I came up with. The configuration is quite simple, setup an OpenVPN [...]
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One of the questions I get asked several times a week by my clients is as such. While most people never associate latency with the amount of data they can send across a single TCP stream, engineers need to understand this concept.
Luckily, someone has done most of the leg work for us. Many years ago, [...]
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While I’m sure this post will make my friends at ImageStream gag, it is a necessary evil. I realized the other day that I don’t talk much about the network engineering side of my life, at least, not on here. Since I’ve been relying on consulting for my primary source of income, I realize that [...]
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