Great little hack, Ejay!
The other idea, if you're migrating IPs, is to just shorten the lease time.
Say your normal lease is 7 days, then 6.5 days before you're planned
migration change the lease time to like an hour or so.
The other migration method is to use ip address secondary and just let
them migrate as they go with both networks functioning until all leases are
moved over (you disable the first lease, and have a second lease with the
new network configured, which they'll have to go to once their lease runs
out).
You'll always have a few stupid machines out there that just either won't
release the IP, or will go to 0.0.0.0 or 169.254.x.x and won't find the new
DHCP server (or won't accept a new lease). I've never found a rhyme or
reason to it, but it just happens (usually forcing a release all, renew all
fixes it).
--
Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
""Hire, Ejay"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> You can't force them to do it at a specific time, but you can deactivate
the
> scope so that when their IP expires they get a new one.
>
> Alternately, you can include the following chunk in their login script.
(not
> tested under win2k)
>
> --Begin Chunk--
> if not exist c:\renewed.bat
> echo @echo off > c:\renew.bat
> echo ipconfig /release >> c:\renew.bat
> echo ipconfig /renew >> c:\renew.bat
> call c:\renew.bat
> ren c:\renew.bat c:\renewed.bat
> --Begin Chunk--
>
> You have to put in the whole chunk like that because of the way a batch
file
> is executed. If you just put ipconfig/release, and then ipconfig/renew in
> the Login script, they will lose their connection to the network and never
> execute the ipconfig/renew.
>
> Good Luck,
> Ejay Hire
>
>
> -----Original Message-----
> From: Nabil Fares [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, May 24, 2001 11:17 AM
> To: [EMAIL PROTECTED]
> Subject: OT: DHCP question [7:5745]
>
>
> Greetings all,
>
> For those with pretty good DHCP knowledge, how can I force a user to renew
> his IP address/lease from the DHCP server?
>
> Running Linux with ISC DHCP server
>
> Thanks,
>
> Nabil
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