[ILUG] DHCP Problem

[Dermot Buckley]

Hi all,

Having a DHCP problem here which someone may be able to help me with.

We have two main offices on separate subnets (192.168.32.0/22 and
192.168.36.0/22), each with it's own dhcp server (respectively
isc-dhcpd-V3.0 and 2.2), and we have two users (both laptops running NT4)
who regularly move between the offices.

The difficulty is that to get a lease the users need to manually configure
their ip address to be in the subnet in question and then switch back to
dhcp - otherwise the computer fails to see the dhcp server.

The dhcp server (both are Debian running 2.2.19 kernels) sees the
DHCPREQUEST, and responds with a DHCPACK, but the client for some reason
doesn't seem to get the response.  This repeats three times in total and
eventually the client gives up.

This is the config file (/etc/dhcpd.conf) for the 192.168.36.0/22 subnet

	server-identifier setanta.cork.clients.ie;
	option domain-name "cork.clients.ie";
	option domain-name-servers setanta.cork.clients.ie, balrog.cork.clients.ie;
	default-lease-time 1209600;
	max-lease-time 2419200;
	authoritative;
	ddns-update-style interim;

	subnet 192.168.36.0 netmask 255.255.252.0 {
	  range 192.168.36.20 192.168.36.254;
	  range 192.168.37.20 192.168.37.254;
	  range 192.168.38.20 192.168.38.254;

	  option routers 192.168.36.1;
	  option subnet-mask 255.255.252.0;
	  option netbios-name-servers 192.168.36.2;
	  option netbios-node-type 0x8;
	}

The 192.168.32.0/22 file is similar, but without the ddns-update stuff.  The
dns name setanta.cork.clients.ie is valid btw.

When these users go to other sites (presumably running a MS DHCP server),
they do not have difficulties, so there must be something wrong with my
configuration.  We also have a number of Win2k laptops around which do not
experience this problem.

Both of these users are company directors, so I really need to get this one
sorted :)

Any help appreciated,

Dermot.