ospf netmask mismatch

Ondrej Zajicek santiago at crfreenet.org
Mon Jul 12 15:53:31 CEST 2010

On Mon, Jul 12, 2010 at 01:39:25PM +0200, Martin Kraus wrote:
> Hi.  I have bird 1.2.2 running on debian lenny on two routers connected by a
> nonbroadcast configuration.
> first router has on its interface, the second
>  They can't negotiate ospf and I get this in the log:
> bird: OSPF: Bad HELLO packet from - netmask mismatch (
> both routers have additional private prefixes from /25 on their interfaces. Is
> there a problem with such a setup? it works fine on older birds in the rest of
> the network.

The private /25 prefixes uses private IP addresses? There was a change in BIRD
that interface with more IP addresses works like more virtual interfaces with
regard to OSPF, but it should not cause problems and it was earlier change
(~ 1.2.0).

It is strange that reported netmask is /31, but you said that it uses . Could you send me output of 'show ospf interface'?

Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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