W2k bad redirecting of Internet

  • Thread starter Thread starter Rodolfo
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Rodolfo

I have a w2k server that has two nics, one local and the other is connected
to a cable modem. This connection works fine for 2 yrars. This week we open
a remote office so we bought routers and attached to the LAN. I have to
include as a default gateway the router IP.

Since then, when the cable modem lost communication and restore it
again(this is normal with our ISP), the server starts redirecting internet
trhough the router IP (obviously it doesn't work). So I have to go to
network properties, eliminate the default gateway, run ipconfig /release
(the network ip of the cablemodem is dynamic). After that everything is OK
so I include again the router IP as the gateway and everithing is fine until
the connection with the cablemodem is lost again ().

Any idea how do I tell windows to redirect trhough the gateway only the X
network and the rest through the cable modem?
 
Rodolfo said:
I have a w2k server that has two nics, one local and the other is connected > to a cable modem.
This connection works fine for 2 yrars. This week we open
a remote office so we bought routers and attached to the LAN. I have to
include as a default gateway the router IP.
Click to expand...



It should be done like this:

You use LAN Router(s) to do the routing for the private network between the
different LAN segments. The LAN Router(s) become the Default Gateway of the
clients connected to the subnets represented by the Interfaces of the LAN
Router. In other words the DG is the Interface of the LAN Router that
directly faces them.

Then each LAN Router uses the Internet Sharing Device as *their* Default
Gateway.

Then IF:......

If your "Duel-nic W2k Server" is between them and the Cable/DSL box then
that W2k Server will be the Default Gateway of the LAN Routers. Static
Routes must be added to the W2k Server for the other subnets to the other
offices. The W2k Server will only have *one* Gateway and it will be the
Cable/DSL Box.

Or IF:....

If the W2k Server is made a "single nic" server then it is irrelevant and
plays no role in anything. The Cable/DSL Box becomes the Default Gateway of
the LAN Routers. Static Routes must be added to the Cable/DSL Box for the
other subnets to the other offices.

By making sure that the Cable/DSL Box (or the W2k Server) is *not* the
Default Gateway of any of the computers (just the LAN Routers only) it keeps
the network selfsufficient. It will function perfectly fine without the
Internet at all and without the Cable box (or Duel-nic Server). But if the
Internet shareing device (cable box or duel-nic server) is the default
gateway then if the Internet shareing device goes down, you not only lose
the internet, but you lose LAN connectivity between the private subnets as
well.

You want this:....Internet Sharing Device in the DG of the LAN Router.
The DG of Subnet1 is also the Lan Router just like other subnets.

Subnet2 (DG is LAN Router)
|
|
[LAN Router]--Subnet1--Internet Sharing Device---Internet
|
|
Subnet3 (DG is LAN Router)



Not this:.....

Subnet2 (DG is the ISD)
|
[Internet Sharing Device]------Subnet1------Internet
|
Subnet3 (DG is the ISD)
 
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