[dns-operations] BIND forwarders question

[Michael Monnerie]

I apologize for this beginners-like question on this high-level list, 
but I'd like some clarification where I didn't find a solution. It's 
about BIND behaviour in detail, but I think the answer is resolver 
independent.

We are having 2 sites at different locations now with a DNS resolver on 
each site. Internet speed between those two different ISPs is very fast, 
and the hosts to resolve will be about the same because of similar 
services.

My idea is to use forward X; on site Y and forward Y; on site X, but, as 
I couldn't find it in the documents, I believe this could lead to a 
resolver loop between X and Y and therefore even slower resolution. 
Or is BIND clever enough to only ask the other server once?

The other option would be to only setup one site to forward to the 
other, but that would only fill one cache good and the other poorer. 
Still, as they resolve similar hosts, if the first option 
can't/shouldn't be done, it's better than nothing.

mfg zmi
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