[SLUG] BIND / Network connection

[Paul Robinson]

Hi Sluggers,     Firstly, appologies for mail client, I'm currently without a Linux Desktop. I was wondering if anyone knows how to bind a program to a particular IP for outgoing communications? Specifically I am setting up Bind as a secondary DNS and it's grabbing zone info from a master server.. The master is a Win2k box that is set to accept zone request info from domain only. For each of the 3 domains he's set the ns2 (the linux box) to be a different ip so that when reverse lookups are set up it will only show the relevant domain).       I've scoured the web and I've found doco's on how to run multiple instances of bind and to set each to listen to a certain ip. This is all great but it doesn't set the src ip of any requests it makes to be the ip it listens to. So what happens is that although the linux box has eth0 and 18 aliased ip's on eth0 (ie eth0:0 - eth0:17) whenever it tries to grab the zone info from ns1 all the win2k box see's is the eth0 ip.   I hope this makes sense as I'm not 100% sure if this is the most easily understandable explaination.. I guess essentially what I'm trying to acheive is to spoof the ip address like nmap can do.. I was wondering if ipchains might have been the answer.. because the ns1 for each domain has a different ip and I was wondering if there is a rewrite ip header ability where if dest ip = ns1.domain1 then rewrite src ip to ns2.domain1.   Is any of this possible or am I asking for things that shouldn't be? I'd prefer it if there is an ipchains/ tables solution rather than a multiple instance of bind solution as that way there's just 1 instance of bind running and hence there aren't the performance overheads to contend with.   Thanks in advance.   Paul