From: Duncan Maccubbin (duncan.maccubbin@earthlink.net)
Date: Tue May 30 2006 - 14:53:15 ART
Just to verify...you want to check that DHCP is working on a remote LAN without connecting to it? If so, SLA can do that:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hsla_c/hsdhcp.htm
-----Original Message-----
>From: "Schulz, Dave" <DSchulz@dpsciences.com>
>Sent: May 30, 2006 1:20 PM
>To: Geert Nijs <geert.nijs@simac.be>, ccielab@groupstudy.com
>Subject: RE: checking DHCP (forwarding) from a router interface
>
>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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