Advertise IPs as single regardless of prefix

Anthony Hoppe ahoppe at backblaze.com
Tue Sep 30 19:05:40 CEST 2025


Hello List!

I am working on a project to bring L3 down to the individual host and
am thinking through the transitionary configuration.

For the purposes of this discussion, the hosts are assigned IPv4
addresses within a /24 and IPv6 addresses within a /64.

Currently, I'm using a dummy interface and adding the IPs they own as
v4 /32 and v6 /128 and in combination with an export filter to only
export /32 and /128 prefixes, this works great.

However, I was wondering if there is a way to configure BIRD so that
for the IPs configured on the host it supplants the configured prefix
with /32 and/or /128 allowing me to eliminate the dummy interface?

The dummy interface is mostly a transitory step as Linux (Debian, at
least) will not let me assign a /32 or /128 to an interface where a
larger overlapping prefix resides (which yes, I understand why you
normally don't want to do this, haha).

~ Anthony

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