[sclug] DHCP and DNS

Tom Dawes-Gamble tmdg at tmdg.co.uk
Mon Apr 25 02:52:10 UTC 2005

Like so many answers "it depends",

In this case it depends how much control you have over your DNS.
It also depends on what version of bind you run.
Finally it depends on weather you have a fixed IP on your broadband

I you have to run bind 9.  You then use views to present differing

I do a similar thing to what you want to do.

I use IpCop 1.4.5 it does the dhcp for me.  I configure it to assign ip
addresses according to the mac address.

I point IpCop at my DNS server. When queried from my ip address any host
on my internal lan is returned a private IP address.  i.e.
But any other hosts asking for a host on my private lan get the public
IP address of the IpCop firewall.  ( I understood that you should not
publish private addresses to the outside world. )


For a more detailed explaination.


On Mon, 2005-04-25 at 01:38 +0100, Will Dickson wrote:
> Hi all,
> For various unimportant reasons, I decided it would be an idea to 
> migrate my LAN to DHCP. Well, it is the 21st century and all that... 
> Specifically, I'm running a Smoothwall Express (firewall) which inter 
> alia provides a DHCP server, so I thought it ought to be fairly 
> drool-proof to set up.
> Indeed, the main DHCP bits were - set up the server, told the LAN boxes 
> to use it, and they got their IP addresses and DNS details from the 
> Smoothwall. DNS proper works fine - I can resolve addresses of machines 
> on the external Internet etc.
> The problem is that my LAN hosts provide various services to each other, 
> so they need to be able to resolve each other's names. I assumed 
> (without, I confess, having really thought it through) that the DHCP 
> server would wave some kind of magic wand and make this work. However, 
> it doesn't.
> There seem to be two possibilities here: a) this ought to work, and I've 
> cocked up somewhere; b) I'm asking for the moon on a stick, and if I 
> want this to happen I'm going to have to put in some actual effort.
> Can anybody tell me which of these is closer to the truth?
> Will.
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There are 10 types of people in the world.
Those that understand Binary and those that don't.
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