Possible lease conflicts with DHCP?

[undrcovr]

All of our workstations get IP's assigned dynamically through the DHCP server. They are leased for 7 days.

I am noticing that when some of our laptop users connect at home and get a IP assigned through their ISP's DHCP server, they cant get one assigned from our's when they return to work within the 7 days of the original lease. I then have to assign it statically and wait for the lease to end.

I have tried ipconfig /release, /renew, /flushdns, and /registerdns. Nothing works!!! Is the 7 day lease causing the conflict? Why?

 

[joepc]

What os are the laptops with DHCP problems running?

What are you using for a DHCP server?

 

[undrcovr]

Laptops are XP sp2 and DHCP is Win2k Srvr.

 

[joepc]

So if you have a laptop in the office that was brought in from home, and you run an ipconfig /release then renew it does't get an ip address right. Will it at least release the old ip?

Have you tried to see if they can get an IP assigned with a different DHCP server? ex. home router/firewall.

Also might not be a bad idea to have the home users install a home router/firewall.

 

[undrcovr]

It releases the old ip but it wont get a new one. So yes, they do get an ip from their isp's dhcp or a nat ip from a router.

We have 50 users, I cant ask them all to install a router/firewall.

The conflict is the 7 day lease so I dropped it down to 16 hours. We will see what happens.