ISP's who where affected by the misconfiguration: start using IRR and checking your BGP updates

Patrick W. Gilmore patrick at ianai.net
Wed Feb 27 04:03:31 UTC 2008


On Feb 25, 2008, at 11:40 AM, sthaug at nethelp.no wrote:
>> I've only dealt with a handful of the bigger networks, but every  
>> transit
>> BGP session I've ever been the customer role on has been filtered  
>> by the
>> provider.  From memory and in no particular order, that's UUNet,  
>> Level3,
>> Digex, Intermedia, Global Crossing, Genuity, Sprint, Above.net, Time
>> Warner, C&W, MCI, XO, Broadwing, and a few smaller ones nobody's  
>> likely to
>> have heard of.
>
> There's at least one reasonably big transit provider that does *not*
> do prefix filtering: TeliaSonera (AS 1299). They *do* perform as-path
> filtering, but the effectiveness is disputable...

No, the effectiveness is not disputable.  It is guaranteed to be sub- 
optimal.  This is not in doubt or question.

See, as has been quoted many times, as7007.

-- 
TTFN,
patrick




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