Fran:
Hey,

I ran the following combinations without problems:

Debian 10, kernel 5.8 backports, bird 2.0.7
Debian 10, kernel 5.10 backports, bird 2.0.8 (from suse repo)
Debian 11, kernel 5.10, bird 2.0.8 (from Debian Bookworm repo).

sysctl values (unchanged since ~ 2 y):

net.core.rmem_max=67108864
net.core.wmem_max=67108864
net.core.wmem_default=8388608

thanks for your feedback.
Christoph

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