sorry if this is in the wrong place.
is it possible to forward port say 81 from one pc to port 80 on another webserver? here is my problem I have 4 webservers that use port 80 and my ISP blocks port 80, and I cannot change the ports on the webservers. so I would like to open ports 81,82,83 and 84 and send them to the IP's of those webservers. my router is a firebox edge, which I haven't installed yet, but will be shortly.

Yes, you use the router's configuration to do this. Generally speaking, you create different rules, such as all incoming WAN traffic on port xxx is forwarded to the internal (LAN) IP address yy.yy.yy.yy on port zzz. See your router configuration manual for more details.

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