From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Tue May 30 2006 - 14:20:45 ART
Geert -
You can set up another router on the same LAN as the Ethernet port on
the router in question to provide the DHCP services for this router, and
then.....to allow another router to provide DHCP for the hosts on this
LAN through the helper command. Two different steps....but not sure
that this is what you are looking for. Otherwise, yes, it is a chicken
and egg deal. HTH.
Dave Schulz,
Email: dschulz@dpsciences.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Geert Nijs
Sent: Tuesday, May 30, 2006 7:04 AM
To: ccielab@groupstudy.com
Subject: checking DHCP (forwarding) from a router interface
Hi group,
I have come to an interesting challenge that i am trying to resolve.
Suppose i have a remote router connected to a LAN with no physical
access and i want to check/verify that the LAN is capable of DHCP-hosts
(DHCP should be working). I want to verify this without physically
connecting a host to the lan or router (because it is on the other side
of the world).
Does anyone know of any means to do this ?
Tried already the following:
interface Fa0/0
ip address dhcp
no keepalive
ip helper-address 10.10.10.10
This can never work actually (dhcp forwarding using helper-addresses
actually works by attaching the ip address of the source lan. This way
the DHCP server can determine in which VLAN it has to assign an
address....making the LAN itself DHCP we are running in the chicken-egg
problem.......mmm...)
Next i tried something like this:
bridge irb
interface Fa0/0
bridge-group 1
ip address dhcp
no keepalive
interface BVI1
ip address 1.1.1.1
ip helper-address 10.10.10.10
exit
I am trying to bridge the DHCP request generated by the router on Fa0/0,
back to the BVI interface and then forward it to the DHCP server to get
an ip address in the range 1.1.1.x
But it doesnt seem to work....
Any other ideas ?
regards,
Geert
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