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dhcp network pool not working

Greetings.

I'm using a 3620 running 12.3.16a IP-FW-IDS 3DES code as a IPSec server for a single client, not site to site. The conneciton uses 10 dot addresses inside of a NAT. It uses a pool for the moment like

ip local pool ipsec-51 10.200.51.100 10.200.51.199

and I've found the source of one of my last problems. the 10 dot range is a natural Class A mask of 255.0.0.0. When the client connects, I have to manually change the tcp/ip properties of the Cisco VPN adapter to use class C masking, and the apps begin working.

So, what I want to do is to convert the local pool to a dhcp scope pool so that the mask is correct. But, Isakmp barfs over the dhcp pool

--------------------

conf t

!

ip dhcp excluded-address 10.200.51.1 10.200.51.99

!

ip dhcp pool jeffvpn

network 10.200.51.0 255.255.255.0

domain-name bciassoc.net

dns-server 10.200.50.51 10.200.50.41

default-router 10.200.51.1

netbios-name-server 10.200.50.50

netbios-node-type h-node

lease 0 4

!

end

--------------------

and fails not letting the client get an ip address from this new pool.

I tried the same thing on a 3640 12.3.14T7 IPSec same problem. Any ideas?

Thanks,

-Jeff

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