host unreachable

[Stephane Bortzmeyer]

On Fri, May 08, 2009 at 11:22:59AM +0200,
 Kurt Petersen <kurt at ache.dk> wrote 
 a message of 17 lines which said:

> named[6379]: client x.x.x.x#59767: error sending response: host unreachable
> 
> I can ping x.x.x.x so I'm confused. 

On today's Internet, ping is a poor connectivity test because most
machines are behind firewalls and firewalls discriminate depending on,
among other things, the protocol you use.

Also, do you test immediately? Connectivity can change with time.

May be a tcpdump at the time of the query would give you more information.