From: Petr Lapukhov (petrsoft@gmail.com)
Date: Tue May 30 2006 - 08:18:51 ART
Geert,
I don't quite get it:
you want router to OBTAIN address via DHCP, or to PROVIDE addresses
via DHCP without having an ip address configured at interface?
If latter is the case, you may check
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801d1dfd.html
This may help :)
Also, forwarding DHCP request from no-ip interface wont work. DHCP requires
giaddr field
to be filled in, and that value is taken from interface' ip address.
HTH
Petr
2006/5/30, Geert Nijs <geert.nijs@simac.be>:
>
> 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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