Check http://www.isc.org/products/BIND/docs/config/options.html for example
(you can find more stuff of the same site). This is for BIND 8, so it 
doesn't work
with the old 4.
I've included the part you asked for below.
Note that you can run just one instance and use ACLs, but if there's a bug 
or a misconfiguration,
then you lose the control, a problem not found with multiple instances.




excerpt:
======
The interfaces and ports that the server will answer queries from may be 
specified using the listen-on option.
listen-on takes an optional port, and an address_match_list.
The server will listen on all interfaces allowed by the address match list.
If a port is not specified, port 53 will be used.

Multiple listen-on statements are allowed. For example,

     listen-on { 5.6.7.8; };
     listen-on port 1234 { !1.2.3.4; 1.2/16; };

will enable the nameserver on port 53 for the IP address 5.6.7.8,
and on port 1234 of an address on the machine in net 1.2 that is not 1.2.3.4.
If no listen-on is specified, the server will listen on port 53 on all 
interfaces
======

cheers,
mouss


At 17:20 07/09/00 +0200, Hugh Bragg wrote:

>This is pretty vague, how do I "bind the listen for each DNS server to a
>specific IP address" ?
>
>Is there any specific online documentation I could read that would help?
>Is this standard practice?

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