Can I use DHCP helper on a Pix that uses NAT?

Can I use DHCP helper on a Pix that uses NAT?

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Subject Author Date
Can I use DHCP helper on a Pix that uses NAT? tristan.rhodes 02-16-2006
Posted by on February 16, 2006, 3:17 pm
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I have a private network (192.168.1.0) NATed behind a Pix 515 firewall.
I use the DHCP helper on the Pix to forward DHCP requests to a DHCP
server outside the private network.

The DHCP server gets the DHCP request (which was forward by the Pix),
and responds with a DHCP offer. However, the DHCP server is trying to
send the packet back to the private IP address of the Pix. Since there
is no route to the private network, the packet never makes it. I want
the DHCP server to reply to the outside public interface of the Pix.

Is it possible to make DHCP work in my situation? Do I need to create
a route to the private network?

Thanks,

Tristan Rhodes


Posted by Merv on February 18, 2006, 10:23 am
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There are NUMEROUS DHCP related bugs in 6.3; so make sure you are using
minimum of 6.3(5)

You may need to all Cisco TAC and get latest 6.3(5) interim maintenace
release


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