Multihomed BIND will not respond to 2nd address

[Mark_Andrews at isc.org]

> 
> I'm having to switch my entire network from the IP address space of one of
> our ISPs to another.
> 
> I'm running BIND 8.2.5 on a RedHat 7.1 box with two NICs, each NIC with a
> single IP address, one in each address space.  The OS install is fresh,
> installed from CD yesterday, and I downloaded BIND from isc.org and compiled
> it on the machine in question.
> 
> I have used the "listen-on" configuration directive in named.conf to tell
> BIND to listen on both addresses.
> 
> My problem is:  I cannot get BIND to respond to any requests from any other
> machine on the IP address in the new address space, but it responds
> beautifully on the old IP.  If I run nslookup against BIND from the BIND
> host itself, I can get replies back from either IP address.  As a test, I
> have reconfigured BIND to not listen on each IP address, and got the
> appropriate non-reponse I'd hoped I'd see.
> 
> The both IP addresses and the IP stack are working and correctly configured.
> I can ping, ssh, telnet, and ftp the machine in question from another
> machine on the network.
> 
> The only thing I can figure is that I've missed something in my BIND
> configuration.  Any ideas?
> 

	What is your firewall logging?

	Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org