Lasse Jarlskov – Anatomy of a BGP Spoofing Attack + BGP Filtering: A Quick Overview
Lasse Jarlskov is Peering Manager at Telia Company, a long-time expert on peering and interconnection, and an advocate for BGP routing security.
At BalticNOG 2026, Lasse will bring a real incident to the stage with his talk, “Anatomy of a BGP Spoofing Attack + BGP Filtering: A Quick Overview.”
A Random Friday Evening in July
A BGP update shows up carrying a customer prefix and a correct AS path. But it’s not coming from that customer’s network. A few minutes later, it’s gone. Forty minutes later, it’s back, only to disappear again just as quickly. Over and over.
That’s how Lasse’s talk opens: a real BGP spoofing attack on a customer in Lithuania, as it actually unfolded.
Digging Into the Details
Lasse will walk through the specifics of the attack, trying to reconstruct how it might have happened in the first place. A correct AS path with a spoofed origin isn’t the kind of thing that shows up by accident, and Lasse will get into what that pattern suggests about how the attacker operated.
What Could Have Stopped It: BGP Filtering
From the specific incident, Lasse pulls back to the general problem: what mitigation actually looks like. The talk includes a quick overview of BGP filtering, the kind of practical, everyday defense that could make attacks like this harder to pull off in the first place.
Why You Shouldn’t Miss This Talk
BGP spoofing isn’t hypothetical, it happened to a real customer, on a real Friday night, and Lasse was on the other end of it. This talk gives you a rare, detailed look at what an actual attack looks like from the inside, not just the theory of what could go wrong.
If you operate a network that peers or carries customer routes, this talk gives you both a cautionary tale and practical filtering guidance you can actually use.
đź“… When: 23-24 September 2026
đź“Ť Where: BalticNOG 2026, Riga, Latvia
đź”— Don’t miss BalticNOG! Register today: https://balticnog.org/tickets/
