Re: ULA BoF

[Iljitsch van Beijnum <iljitsch () muada com>]

On 2-jun-2007, at 1:27, Fred Baker wrote:

> But ULAs *do* require router magic. They require a policy to be in  
> place that causes them to not be advertised unless the policy is  
> overridden, and a policy that doesn't believe them even if they are  
> mistakenly advertised.

Well, there is no such thing as an out-of-the-box BGP configuration,  
so that's to be expected.

Although ISPs tend to let packets with RFC 1918 source addresses slip  
out from time to time, they're actually pretty good at rejecting RFC  
1918 routes: currently, route-views.oregon-ix.net doesn't have the  
10.0.0.0, 172.16.0.0 or 192.168.0.0 networks in its BGP table (there  
are two entries for 192.0.2.0, though). So in IPv4 the magic is of  
sufficiently quality.