DHCP relay agent?

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Ello,

I'm configuring a new network from scratch. At the moment I don't know the broadband provider details (great!), but have configured the router/firewall best I can (to allow for more time over the next few days to configure their 2003 server, active directory...well, everything except the cabling / patching).


I'm using a Draytek (Vigor 2800 series) and the default address range is totally different to the one that we want to use.


When i've done this before, we've just changed the default to the one we want, but I was wondering if it Is it possible to leave it so that the server (which will act as DHCP and DNS) can connect to the router via the default ip, but I can use a different address range for itself and it's DHCP and DNS??

I didn't think it was possible as they need to work on the same address scheme?...

...But then remembered something about a DHCP relay agent? If this works, how do I enable it on the server - is that via routing and remote access?, and do I need to do anything first to allow for this capability? (haven't got that far in my exams yet!!)


Cheers,

L

 

sorry i can't help just wanted to say you seem to have such a cool job. this job was supposed to be something like that but turns out it weren't and i'm bored hence the 101 posts i've made today

grim

 

Hey Sparky!

Thank you - your first suggestion does sound a lot less hassle, and since I want to prove I can do a good job in a limited amount of time, I'm going to do the former!!

(though if anyone can explain dhcp relay, i'd be very grateful for future ref!!)

Have only worked with Drayteks so far, so can't really comment!

Why do you say that, and what do you find is good??

 

I do not think a DHCP relay agent and a DHCP server would work well in the same network. After all, the relay agent only kicks in after a few seconds (default = 4) after it finds no responds from the DHCP server. In other words, the relay works if the server does not work.

 

Depends what you mean by the same network? If you mean subnet, then no you would never put a relay agent in the same subnet as a DHCP server as it would be pointless and it's not meant as a backup DHCP server which I get the impression you think it may be.

You would only need the relay agent if you wanted to serve DHCP clients on a different subnet.

 

No quite. You could set up a relay agent as a fail-safe. The 80-20 rule has to ring a bell.