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Router and Network configuration

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by ericm

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My company recently split our fractional t-1 line so we could have internet access via a router. I am unable to access the internet though, and believe it has something to do with my network configuration. I have attached the router to a NIC card on the server, and assigned it's IP address and subnet. The other NIC card is connected to a switch, for our internal network. Using the IP address of the router as the gateway, I am still unable to get a connection to an outside IP address. The internal network has a different subnet than the NIC with the router. Any suggestions would greatly be appreciated.
Eric Morrison
emorrison@flashcom.net

3 replies

by tech

I have noticed several things you might want to look into.

-Your external nic card IP address should not be the same as that of any other server using that T-1 line.
-Do not setup the gateway IP address on your internal card, instead set it up on your external nic card pointing to the IP address on the next server out to the internet, which in your case is probably your ISP.
-Did you get an extra IP address after they split your t-1? As far as I know you will need one for the new server your setting up. Two servers cannot use the same IP address.
-Are you setting up a proxy and a firewall for clients? Are you on an NT and using IIS?
-The subnet should be OK as long as the internal card matches your internal networks subnet and visa versa.
-Also, make sure you have setup your DNS servers and your host name which needs to match your computer name. The domain should match your ISP name, example pacbell.com. your server then would appear to other pc's as, example: yourhostname.yourispname.net

So many things you have to correctly setup, but I would ad that this setup might not work for your situation since I don't have a full handle on what you have exactly, but I would definitely look into why you setup the gateway onyour internal card, that does not compute with me.

Hope this helps a little.

by wmusil

Can the server you are talking about access the internet? I assume that you are using MS Proxy and that you IT department has given you 1 good IP. If the server has internet access. 1. Set the default gateway on the server to point at the IP addressof the T-1/router NOT the NIC in the server. 2. Make sure that the IP addresses of the two server NICs are NOT in the same subnet. 3. Ensure that source routing on the server is active. 4. Set the default gateway on the clients to the Switch NIC on the server. 5. Configure proxy for the protocols you wish to provide, ftp, http etc.... These will be diabled by default (Server works, clients don't).

by mib_admin

Did you attempt pinging the IP addresses of the router or swtich? Trace the path thru to see where it stops. Make sure the path points to the next address and has rights to go thru. Check default IP's,DNS and mask configs. This is like going to another country--- everything must be in order.

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