DSL, CItrix and Mac

i osted this in the tech q&a but no one has
responded -- maybe i'll have better luck here:

Question:
I have an iMac 333MHz constantly connected
to the Internet via ADSL through the ethernet
port. i occasionally need to dial-in locally
using the internal modem to a Citrix server for
work. IS IT POSSIBLE TO DO BOTH AT
ONCE??? i dont see why not (but i'm ignorant
;-b ) and i cant figure out how to do it. i guess i
need to maintain 2 TCP/IP connections at
once and since the control panel only offers
one choice at a time (e.g. ethernet, PPP,
appletalk) it seems impossible.

is there some utility out there or software to
get around this?

also:

on another bbs i was told:

>>If you would also like to go over DSL, then
you will have to create a
good routing table. I have no clue how to do
this on Mac. But your
problem lies in routing TCP/IP not in ICA.

A routing table tels the IP trafic that for address
x and y it has to go
through door A and for other addresses it has
to go throught door B.

First try to find the IP addresses of your
internal Citrix servers.
These are the ones you use when dialing in.
Lets say they have the IP
addresses: 10.10.10.1 / 10.10.10.2 /
10.10.10.3 throught 10.10.10.10

Your routing would have to look in this way:

Network MASK Connection
0.0.0.0 0.0.0.0 DSL connection
10.10.10.0 255.255.255.0 DIALIN
connection

I have however, no idea what he's talking
about much less know how to do it. Anyone?