Questions about DHCP

[onel.riveron]

The router circled in red will be my DHCP server. Can I use that router to assign an IP address to all the routers not directly connected to the switch?

If yes, please give me a hint where to start.

Thank you!!!

[Francesco Molino]

Hi

Cisco IOS can act as dhcp server and allocate an IP address dynamically on the right pool based on option 82 from your replay agent (another Cisco router for example).

If we analyze your network, R6 and R3 knows how to reach R5 which is your dhcp server. If you want to sign dynamic IP to R1 interface (f1/0), you'll need to configure ip-helper and option 82 on f1/0 on R6. But it will become harder when you'll need to assign an IP on f0/0 and f0/1 from R1 as the facing interfaces on R2 and R4 are down.

I bet this is a lab you're doing but usually we don't have all routers and all their interfaces in dhcp assignment because it will be hard to achieve that in a real world.

[schaef350]

You can use the "ip helper address <IP address>" command on the interfaces of other routers (for instance the fa0/0 interface of R2) to forward DHCP requests it receives from R1's f0/0 interface to your master DHCP server router (R5).   You would of course need to have the needed pool configured on R5 for the subnets you hope to allocate addresses for.

Hope that helps... 

Please rate if this was helpful :-)

[paul driver]

Hello

After a lot of work i guess you could but why would you want to?

res
Paul

[onel.riveron]

Honestly, to learn and to get as familiar as possible with these routers and Cisco's IOS. And I also like messing with these things.

I'm preparing to take the CCNA soon, but I don't want just to pass the test, I want to know everything I can and as much of it as possible.