BGP and The zero window edge

Jakob Heitz (jheitz) jheitz at
Wed Apr 21 20:59:06 UTC 2021

Ben's blog details an experiment in which he advertises routes and then
withdraws them, but some of them remain stuck for days.

I'd like to get to the bottom of this problem.

Has anyone else seen this before or can provide data to analyze?
On or off list.


-----Original Message-----
Date: Wed, 21 Apr 2021 07:31:10 -0400
From: "Jean St-Laurent" <jean at>

Nice article explaining a specific BGP corner case not removing routes when
TCP window reaches 0.

The proposed solution is a new RFC for BGP with the suggestion to introduce
a new timer.


Jean St-Laurent /CISSP
ddosTest me security inc

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