ip helper statement for 7921 phones when DHCP is on the router

Unanswered Question
Jan 21st, 2009

I need to set-up a ip helpet statement in my WLC so the 7921 phones grab an IP address. The DHCP scope is on the router.

Where do I point the helper statement to?

I have this problem too.
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sschmidt Thu, 01/22/2009 - 14:56

Wherever you place the helper address it needs to point to the end point that is performing DHCP. The idea of the helper is to take a broadcast DHCP discover and unicast it to the destination because the routers in between do not forward broadcasts by default.

Rick Morris Thu, 01/22/2009 - 15:06

If DHCP is on the router what do I point the helper statement to?

See config below...

ip dhcp pool VLAN60

network 10.125.60.0 255.255.252.0

dns-server 10.1.0.121 10.2.0.122

default-router 10.125.60.1

domain-name lzb.hq

option 150 ip 10.251.125.1

sschmidt Thu, 01/22/2009 - 21:19

The helper address needs to be the address of the router interface that connects to or has a path to where the DHCP DISCOVER originates.

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