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Re: The Gorgon's Knot. Was: Re: Verio Peering Question
On Fri, 28 Sep 2001, Sean M. Doran wrote: > | I also encouraged all other backbones to filter Verio as Verio filters them. > > FWIW, I (continue to) encourage this too. Filter more than Verio, > while you're at it. I used to filter on both inbound and outbound. I don't believe filtering is inherently evil. I believe just the opposite, it is frequently necessary. Especially in a world where you can't verify route announcements and people occasionally announcing every disaggreated network in the table. Sprint had valid reasons for filtering. They had several old AGS routers, and didn't want to/couldn't upgrade them at the time to one of the routers used by other backbone providers i.e. 7000/SSP. To keep Sprint's network working, they filtered routes. This is an acceptable example of duct tape we've all needed to apply to our networks at one time or another to keep everything tied together. What annoyed me isn't the technical decision, but the marketing blitz used to justify it as "saving the Internet." No sales guy wants to say "because our routers can't handle the full routing table." Instead you get the revolving wheel of excuses like 1) Because we are saving the Internet (false) 2) Because ARIN/RIPE/APNIC makes us (false) 3) Because our peering agreements require it (false) Notice how it is always some third-party "forcing" them to do it. If you want to save the Internet, filter both inbound and outbound. Otherwise, don't pretend that's why you are doing it.