Wrong Gateway and IP assigned in subnet

[Pilot1]

Have a strange problem. We have four locations presently, each running on a different subnet. My DHCP server is at the hub site (of a frame relay ckt). I have noticed that when I configure a new workstation for someone, or if I replace an ethernet card, I can get an address and all correct info from my DHCP Server, at hub site. The problem is that when we send the workstation or notebook to operate on one of our other sites (different subnet), they can never pick up the proper addresses. It goes right back to the primary gateway and ip address it got originally. No matter how many times we release and renew the address, it refuses to pick up the new info. What is really frustrating is that I can take my notebook to any of our subnets and it works fine. Has anyone experienced this? Everything else works just fine on the network except this scenario.

Pilot 1

 

[1Cosmo1]

It sounds like your MAC address is still in a table on the server at the host site. When you request an address, the server says "I know about MAC xxxx.xxxx.xxxx, gives out an IP from the host site.
Is the IP address received via DHCP always the same or, is it still on the host's subnet, but the host portion varies?

 

[Pilot1]

The address does stay the same. I'm not sure about the host though. That does make sense though. Can I release that MAC address record? Maybe I'm being dense about this, but I should be able to plug a machine in any of our subnets and obtain my configuration info?

Thanks
Keith

 

[lui3]

When you say different subnets do you mean physical subnets or different routable subnets. ie 192.168.1.0 and 192.168.2.0 would be routable subnets...they need a router to communicate.


If different routable subnets make sure that the dhcp server can serve addresses between different subnets and that the IP HELPER ADDRESS command on the router is pointing to the correct subnet address of the dhcp server at the hub site.

It sounds like you dhcp server is responding correctly if you are able to receive addresses from it when trying to renew. Probably a combination of helper address and dhcp serving multiple subnets.

You could just set up dhcp at each subnet and solve the problem.

 

[lui3]

Also what is the DHCP lease time on your addresses. Might be different for admin users.

 

[marsd]

This sounds suspiciously like it is a lease time problem as
lui3 said. Check your dhcp lease time and known issues
on dhcp renewal for your client platform. Windoze is famous
for this nonsense.