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Wee-Meng,
> Hello,
>
> I'm looking for a dhcp client program that just sends a broadcast
> and queries for all available DHCP servers. The results are then
> output to stdout.
>
> We're running DHCP at our site and from time to time some user
> turns on the DHCP server option in a WinNT server without
> configuring it properly. This causes the DHCP service to fail in
> the entire subnet.
>
> I'm thinking of running this program periodically every half hour
> so that should an bogus DHCP server starts up, I will be
> notified. Before the users are affected.
>
> I can dabble a little in C but I'm not familiar with programming.
> I did have a look at the source for dhclient.c but I found it too
> complicating.
>
> Thanks in advance. In the mean time, still trying to figure out
> what's happenning in dhclient.c
>
> weemeng
This may be a bit overkill for what you are looking for, but you can
try nmap (http://www.insecure.org/nmap/index.html). It is a port scanner,
and you can do something like this:
% nmap -sU -p 67 a.b.c.1-254
Look for anything that has port 67 open, and you'll find those with DHCP
servers. I found a *lot* of NT machines misconfigured (read: with DHCP
server and/or relay and/or RAS enabled) when I upgraded to 2.0b1pl18. It
helped tremendously.
Of course, it has other uses besides this. I consider it a very
valuable tool.
Don
---
Don Badrak <[EMAIL PROTECTED]> 301.457.8263 work
Telecommunications Office 301.457.4438 fax
U.S. Bureau of the Census
Suitland MD, USA
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