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W2k based LAN router question

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Haploe79

Instructor
Apr 10, 2003
17
US
Ok, this may sound a bit stupid, but I've recently taken over a network and plan on reworking their current routing situation. To make a long story short, its bad. There are 3 different servers all acting as routers to connect.....3 network segments together.

My problem is that the new server I'm trying to set up will allow SOME computers to talk through it and others not. I think the problem is the other machines' routes are still messed up, but won't know til I take the whole thing down. As it stands now, all computers can talk on the internet through theses computers, but there is no NAT or ICS installed on them. There HAS to be some form of translation to allow these private IPs to talk on the net right?

None of the servers have it installed, and all are plugged directly into a cisco router from the cable company. Now I assumed the router was doing it, but all 3 servers have public IPs through it, and the old network admin said he never set anything up with that router to do it, so I don't think that's the case either. Can anyone tell me how the internal IP's are talking on the net??
 
Is your 3 servers got 2 NIC each? (1 for public and 1 for internal).
 
Questions:
1. The routers (internal ones) are Win2k?
2. Proxy installed on them?
3. What about CISCO box? Are you sure that they are not using NAT? NAT is defined for network addresses class. So, it will be able to offer NAT, and also to serice direct access (the internal routers)
4. DHCP servers?
5. How looks the IP configuration of the clients?
6. Are the clients (all) able to communicate between them? (subnet1 to subnet 2,. etc)

Gia Betiu
giabetiu@chello.nl
Computer Eng. CNE 4, CNE 5, MCSE Win2K
 
Ok, first off, yes each of the 'router' servers are multihomed...actually have 3 nics each(one of the many problems with the current setup). There is no proxy service setup, only ISA on some. Through RRAS there is no NAT or ICS setup on any of the machines and just confirmed today that the cisco router from road runner is NOT setup as a nat either.

After finding this, I just went ahead and set up a NAT on the new server and all is well, but I still have NO idea how the internal PC's are able to talk on the internet with no nat or ics set up anywhere and only 4 public ips to our name..
 
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