Strange DHCP problem

  • Hi all!

    I have the following settings:

    |–-------|- WAN --------------------------------------|--------|--> (External IP 1 (82.192.53.x) via DHCP ISP Cable modem)
    -- LAN -| pfSense |                                    ______________  | Switch |
                                      |---------|- OPT1 --| Cisco PIX VPN | --|--------|--> (External IP 2 (82.192.53.x) via DHCP ISP Cable modem)
    NAT on pfSense (Outbound)
    Interface  Source  Source Port  Destination  Destination Port  NAT Address  NAT Port  Static Port  Description
    OPT1 *               *               *               *             *             NO                PIX 
    WAN *               *               *               *             *             NO                Auto created rule for LAN

    Rules on pfSense (LAN)
    Proto  Source  Port  Destination  Port  Gateway  Schedule  Description 
    TCP         LAN net *    * OPT1              VPN Comp 1 
    TCP         LAN net * * OPT1          VPN Comp 2 
    *              LAN net * *                 * *                   Local LAN

    What I have want to make with this setting is that some traffic from LAN which go on subnet must go thru OPT1 interface, all other traffic thru WAN on Internet. On pfSense I have enabled DHCP Server only on LAN.

    I have now problem that if pfsense boot before PIX I get on pfSence thru LAN interface DHCP request from PIX external interface and pfSense answer on DHCP request with internal IP 192.168.3.x. This result with VPN down...

    I'm very sure that I have set something wrong on pfSense but when I have look here for solution I mostly get Load Balancer (how-to) but I don't wont it here because I have rules based route.

    I will be very thankfull if you can help me!

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