DHCP Help

[luckybob34]

We recently reconfigured our network from a static route single subnet to EIGRP with multiple subnets. In doing this I also created a DHCP pool for each branch location. The superscopes look like this:

MAIN - 192.168.10.1 DHCP 192.168.10.50-192.168.10.200
LOC1 - 192.168.20.1 DHCP 192.168.20.50-192.168.20.200
LOC2 - 192.168.30.1 DHCP 192.168.30.50-192.168.30.200
...etc

My issue is when users from one location go to another location with their laptops. Since the lease is 12 hours, they are unable to pull a new address, but get stuck with the old address.

Example:

User 1 works at LOC2 and has an address of 192.168.30.51 with a lease of 12 hours. He goes to the main office for a meeting and connects his laptop to the network. He receives an address of 192.168.30.51, but is connected to a port for vlan 10 (192.168.10x).

How can I fixed this issue?

Multiple DHCP servers is not the best option as we have 7 DHCP pools to deal with.

I would rather not summarize the networks, as this would lead to one giant DHCP pool and there would be no structure to the IP address handed out. First Come First Severed.

Can anyone point me into the right direction for a soultion to this issue?

Thanks

 

[Davetoo]

ipconfig/release
ipconfig/renew

I'm Certifiable, not cert-ified.
It just means my answers are from experience, not a book.

There are no more PDC's! There are DC's with FSMO roles!

 

[luckybob34]

Thanks for the advice, but this is not a solution.

If you release and renew your IP at the computer level, it will just pull the reserved address.

I have lowered my lease times, but that is still not a solid solution.

Anyone else have any insights.

 

[FireMike84]

Are you using a server to administer the DHCP pools or are you using a router? You could always setup DHCP on the routers at the different branches to only give out internal IPs of that branch. I know you said that multiple DHCP servers is not a option so I don't know if you can use the mutiple routers or not. Are the users acutally pulling the wrong address or is the address still stored when they plug into a different branch office?

How low have you tried setting your lease level, have you tried setting it to 0?

According to all the microsoft documentation you superscope should be working properly. I have included the link below for Microsoft in setting up Super Scores, I am sure you have read this but thought I would include it anyway.

http://technet.microsoft.com/en-us/library/bb727003.aspx

I also included this link to another forum talking about the same kind of problem.

http://www.itnewsgroups.net/group/microsoft.public.windows.server.networking/topic34701.aspx

Hope this helps

Mike Walton
Network+ CCENT
Free Tech Articles at

http://www.mikenetpc.com