You need the IP-Helper address on the router interface which is nearest to your DHCP clients, so if I'm understanding your set-up, it would be on the 1720 ethernet and the helper address would be that of your DHCP server. Obviously you will have to have a scope on your DHCP server which corresponds to the ethernet subnet on your 1720. You may want to control which ports are forwarded as an IP helper address sends a lot more than just DHCP, such as TFTP, Bootp, DNS, and a few others IIRC, so use no ip forward-protocol udp [port number]
I'm sure others will chip in with pointers for ISDN usage. Gaz ""Shane Stockman"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I have a Cisco 1720 router with 2 x BRI modules and a cisco switch connected > with a couple of PC's.These dial into a Cisco 3640 router.I want to setup > DHCP.I have a DHCP server on the 3640 side with an address range.I looked > for a sample config on Cisco.com but all I got was how to configure a Router > as a DHCP server. > > Does anyone have a sample config on how to set this up.I know that one has > to use ip helper address but where ??? > > Thanks > > > _________________________________________________________________ > Send and receive Hotmail on your mobile device: http://mobile.msn.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=45351&t=45338 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
