Strange DHCP problem

Formator

Hi all!

I have the following settings:

|–-------|- WAN --------------------------------------|--------|--> (External IP 1 (82.192.53.x) via DHCP ISP Cable modem)
--192.168.3.0/24-- LAN -| pfSense | ______________ | Switch |
|---------|- OPT1 --192.168.1.0/24--| 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 192.168.3.0/24 * * * * * NO PIX
WAN 192.168.3.0/24 * * * * * NO Auto created rule for LAN

Rules on pfSense (LAN)
Proto Source Port Destination Port Gateway Schedule Description
TCP LAN net * 193.178.175.1 * OPT1 VPN Comp 1
TCP LAN net * 193.178.175.2 * 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 193.178.175.0/30 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!