Cisco Router DHCP config help.

Unanswered Question
Jun 17th, 2008


I want to setup my router to be adhcp server that also allows for it to list where the next-server is for any clients that do pxe booting. Can anyone help me regarding preparing such a configuration?



I have this problem too.
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bret Tue, 06/17/2008 - 07:59

your dhcp server should look something like this

ip dhcp excluded-address

ip dhcp pool name


default route

dns server

domain name

as for the pxe stuff you will need to put a hlper address in for your pxe server and you may need to allow some sort of broadcast I think.

raviprakash_leo Tue, 06/17/2008 - 08:09

I am not sure if Cisco directly supports PXE booting. But this is a sample config of how a Cisco IP phone and call manager was set up with a Cisco router.

ip dhcp pool "name"


bootfile [name of bootstrap file]



option 66 ip <--- IP address of server

Note the "option 66" command specifies that the machine asking for IP address also is looking for a TFTP server to get the boot file from.

In the IP phone environment, the phones send a dhcp request with option 66. To spedify a list of TFTP servers, use option 150.

Hope that helps. I am assuming that you know all the other options required to setup a DHCP pool.


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