[LARTC] little routing problem /off topic

["virdzek, roman" <rfv@xxxxxxxxxxxxx>]

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