The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Wednesday, September 14, 2005

More Paths

We control IP addresses XXX.YYY.224.0 through XXX.YYY.239.255 and as I mentioned, not all the addresses in that range follow the same path from my home computer to the office. I was curious so I decided to map the paths:

[The various paths of a /20 routing block]

This image shows the overall paths, with the double circles the termination points of the various IPs and as far as I can tell, it looks like the “/20” we have is being routed as 16 individual “/24” networks (aka “Class-C”) through out different providers (some through one, some through the other).

Curiouser and curiouser …

Update on Thursday, September 15th, 2005

Smirk emailed a response to this post:

To: Sean Conner <>
Subject: bandwidth mystery
Date: Thu, 15 Sep 2005 03:35:54 EDT

I think if you check with Dan, we are routing various IP's with preferences for different carriers in order to have our actual bandwidth usage line up with our financial commitments to our carriers.

Perhaps that may solve the mystery?


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