I have an ISA 2006 server set up for VPN access. VPN is configured to use the DHCP server for assigning addresses to clients. On the DHCP server, the Address Pool is 10.91.50.0 through 10.91.50.255. About 10 or so IP addresses automatically get assigned to the ISA RAS pool.
A local DHCP client has gotten assigned 10.91.50.11. For some reason, when a machine on the external network makes a VPN connection, it is also assigned 10.91.50.11, which is not in the RAS IP pool given to it by DHCP. Can anyone think
of a reason this would happen?
There is only one DHCP server. The scope is for all DHCP clients. The RAS server automatically gets serveral addesses from the DHCP server when it starts. There is no relay agent and no DHCP server on the RAS (ISA) server.
I see no errors in either the DHCP logs or the Event Logs on the DHCP or ISA server.
As a test, I started the ISA server without a DHCP server being present on the network and even then the first VPN client was assigned 10.91.50.11. So even though the RAS server assigned itself a 169.254 address due to lack of a DHCP server, it still
assigned 10.91.50.11 to a client. By the way, any additional VPN clients after the first one connects get an address from the pool given by the DHCP server, as expected.
Thanks for any help with this.