Now that you have a block of 8 IPs, did you already setup the ARP 
section for them?
Afterwards, you need to decide if you want to use Server NAT or 1:1 NAT.
After reading over a few of these post, I think Server NAT will work 
best for you. Because you can pick not only port 80, but also the WAN IP 
to direct those request to the box you desire.

I have a setup exactly like this (multiple WAN to many different 
ports/services on the LAN) and it has worked great for years. Just 
remember that for every NAT rule you create, it needs a corresponding 
Firewall rule.  So if you forward Port 80 on .250 to Box 1, you need a 
firewall rule to allow port 80 to that box, then when you forward Port 
80 on .251 to Box 2, you need another rule for the same thing.

Thanks,
Michael

Stewart Gilray wrote:
> Hi,
> Ok so I got our ISP to give us a block of 8 IP' so that's all good.
>
> And I've setup m0n0wall so that .250 goes to BOX1 and .251 goes to BOX2,
> however in Firewall rules I still have port 80 pointing to 1 box only,
> should I remove this rule now? or ... ?
>
> Stewart
>
>   
>
>