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Client IP Address over VPN

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3 replies

by bigjellosheriff

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I am using Small Business Server 4.5 and I have an AS/400 on the same network. I am using a DSL router to connect users to the internet and to receive an e-mail feed to the Exchange Server. The router performs NAT translation so that our internal network is on the 192.168.1.0 subnet. The Small Business Server is also the DHCP server. When users connect via VPN, they somehow are assigned the address 192.168.1.1 which is the static address of the AS/400 and the duplicate IP address naturuallycauses all kinds of problems.
On the NT side, I have tried setting the DHCP server to reserve the 192.168.1.1 address, I have tried excluding the 192.168.1.1-64 range of addresses, and the host file includes the AS/400 reference. On the client side, I have tried manually setting the IP address on the VPN dial-up connection. What else can I do?

3 replies

by stuff

I think the answer probably lies in the configuration of the VPN. I don't have such a system to hand, I'm working from memory so give me a little leaway here.
In the config of the VPN you have a setting that allows you to allocate IP address according to a range that you specify. I suggest you have used the same range as your DHCP server here (or put in something like 192.168.1.1 to 192.168.1.255) I suggest that you allocate static IP addresses to your servers, maybe 1 to 10, then set your DHCP server from 11 to 100, then set your VPN from 101 upwards. Change these numbers to reflect the number of servers/internal and external (VPN) PCs.

Hope this helps.

Chris

by bigjellosheriff

That did it! I kept going to RAS Administrator which wouldn't let me configure the TCP/IP settings. Going into Control Panel>Network>Services>RAS got me into the dialog box I needed.
Thanks, kemo sabe.

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