[gentoo-user] Re: A DNS question.

[David Talkington <dtalk@prairienet.org>]

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Bob Young wrote:

> Obviously on a given system each NIC is usually connected to a different
> domain, my question is, whether or not it is /legal/possible/okay to use
> different *hostnames* on different NICs?

DNS is for other computers to find yours.  Yours doesn't give a squirt 
what other computers call it (web server software might, if it's using 
virtual hostnames, but a router or DNS server won't).  Traffic either 
arrives and is dealt with, or it doesn't.  It can be known by a 
bazillion names, if it makes sense to do so.  I do this for my home 
router as well; each segment has its own network and DNS namespace, and 
thus knows the router by a different name. (*)

You do not, however, want to publish DNS information for RFC 1918 
addresses, as was pointed out.  You should use "views" or a "split 
horizon" configuration, so that private names are only seen by private 
machines.

(*) But use multiple A records, not CNAME.  CNAME is almost never 
necessary, and gains you nothing except an extra query from every 
client. I've seen some cluster configurations in which CNAME offered an 
advantage, but it's rare.

- --
David Talkington

PGP key: http://www.prairienet.org/~dtalk/004B8F8B.asc
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