I have built a very simple LAN in Packet Tracer: a PC, a dedicated DHCP server, a switch and a router.
http://i.stack.imgur.com/Zvx3X.jpg – here is this LAN
The router is meant to be a default gateway in the LAN, and all I want is that the DHCP server would always assign a default gateway address, that it sends to all devices in the LAN, to the router. Router FastEthernet port is configured to get an address from the DHCP server too, using:
Router(config-if)#ip address dhcp
Is it possible to do so, and if yes, how? If no, why? Thank you!
Best Answer
You don't say what DHCP server code you're running, but it's definitely something allowed for in the DHCP spec. In ISC's dhcpd, you'd use the
routers
option, perhaps as follows:which will set the default route for all the clients to
192.168.3.1
.Since your router also gets its address via DHCP, you'll need to set up a special lease for the router's MAC address, so that it always gets the
192.168.3.1
address (to match that set in therouters
option above), and so that it doesn't get fed its own address as a default route.