You have not really provided enough information to recommend a reasonably
accurate solution.
It sounds like the Linux box has not been configured correctly. It could be:
1) Linux box isn't routing
2) IP addresses are configured incorrectly
3) Filtering rules are set incorrectly
4) Internal devices aren't configured with the Linux box as the default
gateway
I assume there's a router in this picture somewhere to terminate the T1?
When the firewall is not in the picture, is the ethernet interface of the
router the default gateway? When you install the firewall are you changing
the IP addresses so that the firewall inside interface is now the default
gateway?
In order for the firewall to move packets from one interface to another
it's addressing and routing must be setup properly. In short, each
interface of the firewall must be configured in a separate IP subnet.
You'll also have to change the LAN IP address of the router terminating the
T1 to be in the same subnet as the outside interface of the Linux box.
Just a few recommendations.
HTH,
Kent
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I've got a T-1 line finally and need to put up a firewall. Right now the
network has 7 computers on it, 3 Linux, 3 Win NT, 1 Win98. I decided I
would use Linux as the firewall box and set up another computer for just
that. I installed everything correctly I think and then connected the
firewall into its own 4 port 3com hub and then connected the T-1 to
that. Nothing. Once I connected the T-1 into the network again without
the firewall, no problems.
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