Tag Archives: comcast

Accurately named network distortion tool

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https://github.com/tylertreat/Comcast

DIY Ground-based Ion Cannon

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Hobbit’s netcat can be used to vomit forth network traffic as fast as your machine can generate it. We don’t need no steenkin’ LOIC!

Anyway, I needed to test a WAN pipe to see if Comcast was delivering the bandwidth we’re paying for – we’re supposed to have a 200 Mbps link to Boston.

[root@monster ~]# yes | nc -4 -u -v -v -n remotehost.boston.com 9

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Turns out the host can generate 80Mbps, sustainable indefinitely. That goes into the 200Mbps Comcast pipe… and only 4Mbps comes out the other end! Thanks, netcat! Time to call Comcast!

Don’t do this if you aren’t ready to deal with the repercussions of completely smashing your network. Saturating interfaces, routers and pipes will severely impact normal business routines, and should be saved as a last resort.

Comcast DNS highly unreliable

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Today we finally solved our email mystery. The reason some people could not get their email from their homes was that they were using Comcast as a service provider.

Querying Comcast’s DNS servers at 75.75.75.75 and 75.75.76.76, we discovered that our domain won’t resolve there at all, and even with the domains that do resolve properly there’s between 20% and 50% packet losses. Comcast’s DNS is broken.

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We’re a Comcast Business Internet customer, and the people failing to communicate with our site are Comcast Home Internet customers (typically “Triple play” buyers) so this is a case where they are actually failing to provide a critically important customer service to both sides of their business. Our users who have Verizon FIOS are working fine, despite Verizon’s long standing practice of unethical DNS hijacking.