Bird: Babel protocol does not work with WireGuard

Publication date: 2020-03-27

Issue: Babel protocol in Bird does not work with WireGuard interfaces

At first, using Babel via a WireGuard VPN link did not work.

Solution: Link local address needs to be configured

WireGuard interfaced do not have IPv6 link local addresses by default. However, these are needed for Babel to work. Thus add link local address like fe80::1 on each WireGuard interface and use that for communication.