Split DNS with BIND 8 with one server?

Pete Ehlke pde at ehlke.net
Wed Jul 3 22:16:15 UTC 2002


On Wed, Jul 03, 2002 at 08:58:48PM +0000, SpitsOnSpammers wrote:
> 
> 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?
> 

Yes, you're missing most of page 298 ;)

listen-on is usually used to tell different instances to bind to port 53
on specific interfaces, instead of on every interface available.
Configuring an alternate port is a rarely used option.

-Pete


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