[Outages-discussion] [outages] 3556 problems

[Brian Turnbow]

TCP Port 179 with packet size greater than BGP keepalive packet but less then update packet might do the trick?


Brian Turnbow
________________________________
Da: Frank Bulk <frnkblk at iname.com>
Inviato: domenica 30 agosto 2020 21:24
A: OUTAGES Discussion List
Oggetto: Re: [Outages-discussion] [outages] 3556 problems

Is there a scenario where an internal flowspec announcement to filter out
certain traffic could have prevent BGP updates from AS3356's edge routers to
get delivered to AS3356's route reflectors, such that even when external BGP
peers dropped their peering sessions with AS3356 that the routing updates
didn't get back to AS3356's route reflectors?

Frank

-----Original Message-----
From: Outages <outages-bounces at outages.org> On Behalf Of Randy Bush via
Outages
Sent: Sunday, August 30, 2020 1:14 PM
To: outages at outages.org
Subject: Re: [outages] 3556 problems

> initial research identified that an offending flowspec announcement
> prevented Border Gateway Protocol (BGP) from establishing

opsec paranoid here wonders about the content of the flowspec
announcement and whence it originated.

randy
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