Split DNS with BIND 8 with one server?

dbotham at edeltacom.com dbotham at edeltacom.com
Mon Jul 8 15:00:28 UTC 2002



Remember, one instance listens on one ip:port and the other instance
listens on a different ip:port.  They do not collide!


Every connection is uniquely indentified by the quad tuple srcip:srcpt,
dstip:dstprt

Within the stack on your name server you can have as many name servers
listening on port 53 as you want, as long as they all listen on a different
IP addresses.

Dave...






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  |       To:       <comp-protocols-dns-bind at isc.org>                                                                            |
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  |       Subject:  Re: Split DNS with BIND 8 with one server?                                                                   |
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>
>I think what is being suggest is that you run two instances (servers) of
>bind on the same physical systems.

I'm not quite sure I follow you.  If both instances of BIND are running on
one
physical host, don't the "listen-on" ports (as described on page 298 of the
4th
Edition of "DNS & BIND" by Albnitz and Liu) also have to be changed for one
of
the instances since, regardless of IP, once the request comes into the
host,
the two named instances would be fighting for the same port?   And if the
external named instance were listening on the standard port 53 while the
internal named instance were listening on port abc, where abc is some
oddball
port, won't all internal application programs which require DNS services
have
to be changed to send requests to port abc (a whole new can of worms since
some
application programs might be hardwired to send requests to port 53)?  Or
am I
missing something here?

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