Detecting Proxy ARP in an IXP LAN - Steven Bakker - AMS-IX

Published: 09 December 2021
on channel: Euro-IX

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On 11 August 2011, AMS-IX suffered a proxy ARP event that resulted in the tragic loss of many innocent BGP sessions. Proxy ARP usually poses no threat to a peering fabric, but there are situations in which it can lead to significant service disruption. On this tenth anniversary of the "Proxy ARP Meltdown", we look at some of the causes of "harmful proxy ARP" as well as how to reliably detect occurrences of this.

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