Anatomy of a BGP spoofing attack + BGP Filtering - a quick overview
2026-09-24 , ROOM BETA

A random friday evening during July. - A BGP update with our customer prefix, and a correct AS-path. But it's not coming from our network. - Then a few minutes later, it's gone.

40 minutes later, there it was again - only to quickly disappear.
Over and over again.


A quick look at the details of a BGP spoofing attack on a customer in Lithuania.
We take a look at the specifics, try to guess how this might have happened and what could be done to mitigate it.

Peering manager at Telia Company.
Long-time expert on peering and interconnection.
Advocate for BGP routing security.