Port forwarding for smtp and pop3 in Windows 2000 server

[Mark]

Hi there, trying to setup port forwarding on a windows 2000 server and i
can't see a logical way to do it with the routing and remote access utility.

here's what i want to do:

our network subnet is 172.20.x.x and our smtp and pop3 servers are on a
totally different subnet, so i want to setup a server so all the clients
need to do is put 172.20.1.15 as the pop3 and smtp server in their email
client and those reqests are forwarded to the appropriate servers on the
other subnet which is reachable from the 172.20.1.15 box (it has two network
cards, one internal address, one external). we can get it working by
multihoming a normal workstation but this is clumsy as we can't use dhcp and
with more than a couple of clients gets a bit difficult to manage.

so, question is, can i do it with the ras service in windows 2000 server or
have i got to use 3rd party software?

any help would be really appreciated,


Kind regards,

Mark

 

[Kurt]

Hi there, trying to setup port forwarding on a windows 2000 server and i
can't see a logical way to do it with the routing and remote access utility.

here's what i want to do:

our network subnet is 172.20.x.x and our smtp and pop3 servers are on a
totally different subnet, so i want to setup a server so all the clients
need to do is put 172.20.1.15 as the pop3 and smtp server in their email
client and those reqests are forwarded to the appropriate servers on the
other subnet which is reachable from the 172.20.1.15 box (it has two network
cards, one internal address, one external). we can get it working by
multihoming a normal workstation but this is clumsy as we can't use dhcp and
with more than a couple of clients gets a bit difficult to manage.

so, question is, can i do it with the ras service in windows 2000 server or
have i got to use 3rd party software?

any help would be really appreciated,


Kind regards,

Mark

This is a job for a router. If there's already a router between the
subnets, you could add a route to the server's subnet in the default
gateway router for your LAN. "Port forwarding" is a function of NAT, and
you could set it up that way (i.e. set up NAT in RRAS). You could even
do it with Internet Connection Sharing (ICS). It's a hack, but it could
work. But regardless of how you do it (NAT or just a plain ole' route),
computers on your subnet will need a route to the other subnet. And if
you don't use NAT, the servers on that other subnet will need a route
back to your subnet.

....kurt