config for SDSL w/static IPs for domain controller & 15+ workstations

[nyccahtech]

My non-profit organization has just changed DSL providers, and I need to
reconfigure the network. We previously had ADSL w/dynamic IP where NAT
was done through the DSL router (Cisco 678). Great, easy, no problem.

Now we have SDSL with a pool of 5 static IP addresses, which I imagine
will come in handy for a number of operational improvements such as VPN,
various servers, etc. But I'm not even there yet. The DSL router is a
Netopia 4652-T with 4 ports; there is a 24-port switch that links the
server & the workstations. If necessary, I can install a second NIC on
the server.

What I need to do is reconfigure the server (running Win2k Server) so
that everyone on the network can a) log on to the server, and b) get
internet access.

Which ports/NICs do I connect, and what configurations, etc., do I need
to make? It seems logical that I would need to enable NAT in some way on
the server, but after spending about 5 hours over the weekend trying to
find the answer via trial and error, I'm stumped. I'm fairly tech-y, but
I just don't have the training to know this sort of stuff.

All help will be greatly appreciated!

-nyccahtech

 

[Robert Reinhardt]

I'm having a similar problem. I too just switched from a DSL service (Qwest)
to Covad's TeleSpeed, which uses the same Netopia 4652-T SDSL modem/router.
In my previous configuration with Qwest, I had five static IP's, and a
gateway IP for the Cisco modem included with that service. The Cisco modem
didn't have multiple ports like the 4652-T has, so I connected the Cisco
modem directly (via cross-over cable) to a Windows 2000 Server, which had an
additional NIC with a connection to my internal LAN. I used RRAS on that
Win2k server to enable NAT, pooling the 5 static ip's from the Cisco modem,
and performing all the port forwarding, vpn, etc from within RRAS.

With the 4652, I was hoping to recreate the Cisco setup easily, but it
hasn't worked out cleanly yet. So far, I have my Win2k server's "external"
nic connected to one of the four ports on the 4652. However, I can't ping
the gateway IP of the router from the Win2k server. Port forwarding seems to
be working from the Win2k server via RRAS, but VPN doesn't work anymore. I'm
pretty sure I need to disable some setting on the 4652, but I'm not sure. I
know it has a "transparent bridging" feature, but the documentation on this
feature is rather lacking.

Of course, all of this is complicated by the fact that I have to call Covad
in order to change any setting on the 4652. (I submitted written
authorization to "take over" the control of the modem myself, but I have no
idea how long this will take.) I have a feeling I can recreate all the
port/ip forwarding on the 4652 and I'm pretty sure the 4652 has VPN support
as well, but I'd rather not try to reconfigure all those settings.

If someone can provide any suggestions, I'd greatly appreciate it.

RE:gards,

Robert Reinhardt