benjojo.co.uk

benjojo posted 27 May 2025 10:56 +0000

BGP handling bug causes widespread internet routing instability

On May 20th 2025 a BGP message was propagated that triggered some surprising (to many) behaviors with two major BGP implementations that are often used for carrying internet traffic.

In a new blog post, I will dissect what that message was, and my thoughts on how it happened:

https://blog.benjojo.co.uk/post/bgp-attr-40-junos-arista-session-reset-incident

A man holding up above his head (as if he is hyped) what appears to be a bomb in a club setting with green lighting in the background, the text says on the image "BGP SID on the gobal BGP table" and many 100% emojis under it

inverse@chaos.social replied 27 May 2025 13:28 +0000
in reply to: https://benjojo.co.uk/u/benjojo/h/sXxlw5Q2f2l1mv5ZCn

@benjojo boosted purely for preview thumbnail

benjojo replied 27 May 2025 13:36 +0000
in reply to: https://chaos.social/users/inverse/statuses/114580029886237629

@inverse thanks! A very non zero % of time was spent crafting the most unhinged social media preview image for the post

erincandescent@akko... posted 27 May 2025 11:05 +0000

Protip for people in governments writing critical infrastucture requirements: consider language like “Your BGP implementation must survive X hours of fuzzing by<tool> without crashing or resetting the session”

@benjojo

RE: https://benjojo.co.uk/u/benjojo/h/sXxlw5Q2f2l1mv5ZCn