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ISA filtering/routing

Posted on 2004-10-26
Medium Priority
Last Modified: 2010-04-14
My situation is as follows:

Internet --- PIX --- ISA --- LAN

The PIX firewall outside interface is connected to the Internet.
ISA Server 2000 (2000 SBS Server) is connected via crossover cable to PIX inside.
ISA Server 2nd NIC is connected to LAN.
IP address of PIX outside is
IP address of PIX inside is
IP address of ISA outside is
IP address of ISA inside is
IP address of Terminal Server is
IP address of VPN client connected to PIX is

What I need to happen is for VPN client connected to the PIX (from Internet) with IP address 192.168.2.x be able to connect to Terminal Server which is on the other side of the ISA box.

What routing/filtering/other do I need to setup/configure on the ISA box. Essentially what I want to do is to allow traffic from 192.168.2.x on the unsecure interface of the ISA box to be routed to the secure subnet ( interface without being NAT'ed or anything else.

I am a quite proficient at routing/firewall/network config, but an ISA dummy, so concepts are ok, but don't assume I know how to do anything at all in ISA (ie. step-by-step would be nice). This is something I have inherited, I would choose to do things differently given the option to start again.


Question by:td_miles
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Expert Comment

ID: 12413724

you can't do that with isa 2000,because its always do nating ,can't routed but in isa 2004 you can do it
LVL 13

Author Comment

ID: 12416514
ok, if thats the case,  what can I do to work around this ?

Expert Comment

ID: 12418751
can you explain more in detail what you want exactly
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LVL 13

Author Comment

ID: 12418898
I want a way for people who are connected to the PIX with the VPN client (and have IP address 192.168.2.x) to be able to connect to Terminal Services on IP

Between the two lies the ISA server.

Accepted Solution

hanano earned 2000 total points
ID: 12419638
you should publish your internal terminal server on isa

LVL 13

Author Comment

ID: 12460565
managed to get it published finally (had outbound instead of inbound, DOH !).

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