Using DHCP with a Cisco VPN concentrator
John Hascall
john at iastate.edu
Sat Jun 17 17:40:54 UTC 2006
> I have been trying to get DHCP set up for (2) Cisco 3030 VPN
> concentrators. I have confirmed that the configuration on the devices
> is correct but I am still not able to get an address from the DHCP
> server. I think the issue may be how the DHCP address is being
> requested. The VPN client are all on Windows XP and running the Cisco
> VPN client. Below is what I am seeing on the DHCP server when the
> request is being relayed via the VPN concentrator:
>
> Jun 16 19:03:05 scratchy dhcpd: DHCPDISCOVER from 00:03:a0:89:22:43 via
> 10.6.1.122: unknown network segment
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> I think the problem is the multiple DHCPDISCOVER requests coming from
> the concentrator / VPN client. Below is a section from a Microsoft
> support site: ...
I strongly doubt this has anything to do with you problem.
The error message you are getting says that your DHCP server
knows nothing about 10.6.1.122 -- the address the requests
are coming from (which is presumably your VPN Conc).
You need to have an appropriate subnet definition in
your dhcpd.conf file which includes that address.
I do not know what your subnet mask is, but perhaps
one of these:
subnet 10.6.1.0 netmask 255.255.255.0 {
}
or:
subnet 10.6.0.0 netmask 255.255.0.0 {
}
or:
subnet 10.0.0.0 netmask 255.0.0.0 {
}
John
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