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VPN in back-to-back configuration

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VPN in back-to-back configuration - 10.Oct.2006 7:02:38 AM   


Posts: 1
Joined: 10.Oct.2006
Status: offline
Hi Everybody,

in my network I have a back-to-back DMZ-configuration, with an ISA 2004 standard edition being the front-end server. The networks affected by this configuration are assigned the following IP-address ranges:

- ISA (external interface): static public IP assigned by ISP
- DMZ network: 172.16.a.b / 28
with ISA (internal interface): 172.16.a.x
        back-end firewall (external interface): 172.16.a.y
        back-end firewall (internal inteface): 192.168.a.b / 24
- VPN-address space is a 172.16.x.y-range outside the DMZ-network's IP-
address range

I configured the ISA server as written in Tom Shinder's "Enabling the ISA Server 2004 VPN Server" article, where I am using a PPTP-VPN so far.
Connecting Windows XP SP2-based clients works fine.
Unfortunately I am only able to reach the ISA server itself through the VPN tunnel.
The back-end firewall's external interface, although it is pingable from the ISA server, when logged on locally, is unreachable through the VPN tunnel.
The back-end firewalluses the ISA as default gateway.
On the ISA server, I added the route to he internal (192.168.a.b) network to the routing tables.

I, too, read the articles about "VPN off-subnet IP-addresses" and the "ISA server solution in a complex network". However, I did not find anything that would have my problem solved.
Could anybody give me a hint, on what to do ?

Best regards

Post #: 1

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