You might like to have a look at Winroute Pro
http://www.kerio.com/kerio.html
I've never tried to use it for what you describe , but it can do packet
filtering for muliple interfaces.

>
> I have the following problem.
> Two Jetstream connections on two phone lines.
> One is Xtra with a fixed IP address (Jetstream Home 1000) that brings
email
> to our mail server and http traffic to the internal web server that we
allow
>
> some people to view. All works OK
>
> The other is just recent and is Jetstart with another ISP with unlimited
> bandwidth but no fixed IP address. It also works well. (Sometimes is
faster)
> Xtra one has Dynalink modem and Jetstart has an old M1122.
>
> I have an XP machine with two ithernet cards running as a firewall to the
> internal network.
>
> If i set the default gateway on the internet ithernet card on the firewall
> to either adsl modem each on works ok but when using the jetstart one as
the
>
> gateway, no email comes in from the internet.
> I have connected the dynalink to the M1122 and the firewall to the M1122
> and both modems are on different IP addresses.
>
> What i want to do is have all "traffic originating here go in out the
> Jetstart line and only "inbound" email and connections coming into our
> server go over the Xtra connection.
>
> Virtual Server settings are set on the Jetstream modem to correctly route
> the traffic through the firewall to the internal server yet it seems when
i
> set the default gateway on the firewall to the Jetstart modem this
incoming
> traffic in unable to get through.
>
> Any help appreciated??

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