LARTC - Mar 2003 - little routing problem /off topic

Hi all,

I have just one routing question.
I set up source routing with iproute2 on my linux router.

              ISP router
           |
               |
       ISP switch (cisco)
        port1|   |port2  (I have 2 ports on ISP switch)
             |   |
       my switch
         |    |
     eth3|   |eth4
     +------------+
     |linux router|
     +------------+
     eth1|   |eth2
         |   |
           LAN   DMZ


All works fine ,traffic from/to LAN goes through eth1-eth3,
and all traffic from/to DMZ goes through eth2-eth4
But all traffic go out to the router
just over first port on ISP switch.
Can anyone help me solve this problem?
Shall I need create VLAN for ISP port2 and eth4 port?

Thanks


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