Lpc2000

I have question, regarding ETHERNET splitter, passive hub. I am 
designing hardware with
LPC213X and ENC28J60 Ethernet chip . PC is going to talk from NIC to 
this controller
TCP/IP (UDP) . Beside this LPC213X is going to communicate with modem 
which has Ethernet port . Also PC will be able directly talk to modem 
( configuration etc. ) 
So basically 3 Ethernet devices communicating ( LPC213X board, PC NIC 
and Modem).
Is there any simple way ( passive connection etc. ) so I could have 2 
RJ45 Ethernet connectors on my LPC213X board and plug-in one of them 
PC and then Modem into second one and be able communicate each to 
another ?
I know that I could use 3 port hub but if I could use something like 
above I would prefer that solution.
Thanks Radim.