A DHCP Relay is what you want. If a user on Subnet A plugs in to Subnet B, they will end up with a DHCPNACK for their old IP followed by the correct IP.
Thanks, Brian Desmond br...@briandesmond.com c - 312.731.3132 Active Directory, 4th Ed - http://www.briandesmond.com/ad4/ Microsoft MVP - https://mvp.support.microsoft.com/profile/Brian ________________________________________ From: Matthew W. Ross [mr...@ephrataschools.org] Sent: Thursday, July 23, 2009 12:38 PM To: NT System Admin Issues Subject: DHCP and multiple Subnets; Multiple DHCP server or DHCP-Relays? Hey list. Since nobody had a good network mailing list, I'll as my question here. We have a large flat network which I'm looking at splitting up. It was 10.x.x.x/8, looking to bring it to several 10.20.x.x/16s. I've got my configuration of the router figured out, except DHCP. We statically assign our IPs to individual machines... but I don't see how that's possible with a routed network like this... especially for mobile users who move across subnets from time to time. I could install a DHCP server for each subnet, but this could be tedious. Using my switch's DHCP-Relay seems like a good idea, but if a user moves to a different subnet, won't that user get an invalid IP address? Any other ideas on how to get past this? --Matt Ross Ephrata School District ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
