Maintained by: NLnet Labs

[Unbound-users] multicast address alerts in logs

Alexander Clouter
Fri Mar 4 22:48:26 CET 2011


Michael Watters <wattersmt at gmail.com> wrote:
> 
> We are running several unbound nodes using anycast and I keep seeing
> this error in the log files.
> 
> Jan 18 11:07:15 rcn-b3s5-01 unbound: [3856:0] notice: sendto failed: Invalid argument
> Jan 18 11:07:15 rcn-b3s5-01 unbound: [3856:0] notice: remote address is 244.254.254.254 port 53
> 
> Are these anything to worry about?  What does this message actually mean?
>
Yes, as DNS queries are not being forwarded and most probably will fail.

The problem is that the source IP for those queries is probably 
incorrect, I am pretty sure 'outgoing-interface:' solves the problem but 
the proper way to solve it is to put your *anycast* address on your 
loopback interface :)

My website covers a anycasting with unbound (and DNS blacklisting):

http://www.digriz.org.uk/ha-ospf-anycast

Cheers

-- 
Alexander Clouter
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