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  • June 26, 2000 at 6:43 am #2075393

    TCP/IP Forwading Help Needed

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    by mail · about 24 years, 3 months ago

    We have an HP LC3 server with 2 NICs installed, NT 4.0 with SP5, IP forwarding on. The server itself can route print jobs to print servers on either network leg, however any other attempt on the network to communicate from one leg to the other doesnot work. More specifically, we are using a machine (win 98, SE2) on leg 1 to dial up the internet through our ISP. We have set up this machine to use internet sharing. All of the machines on leg one can be configured with the IP address of this internet sharing machine as their default gateway, and our standard ISP’s DNS server as the default DNS address and internet access works fine. The leg two machines however can not see anything on leg 1. My two legs are running through HP Pro Curveswitches. Has anyone got an ideas for configuring this network so both legs can see each other?

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    • June 26, 2000 at 6:53 am #3784917

      TCP/IP Forwading Help Needed

      by aaron v · about 24 years, 3 months ago

      In reply to TCP/IP Forwading Help Needed

      If your server knows the Internet Default Gatway, and the systems on Leg2 know the server is their default gateway, then you should be OK. If not, you may need to add a true proxy server/firewall onto the network that both subnet1 and subnet2 wouldconnect through. You could also consider a Layer3 switch to provide the routing from subnet1 to subnet2 for you, instead of burdening your server with that duty.

    • June 26, 2000 at 6:55 am #3784914

      TCP/IP Forwading Help Needed

      by steve cody · about 24 years, 3 months ago

      In reply to TCP/IP Forwading Help Needed

      Check your settings on the server and make sure that the two NICs are on the same subnet. If they are not, then you cannot use the Win98 machine for the gateway IP for the systems that are not on it’s leg.
      I believe that if all of your systems areon the same subnet, that the IP forwarding will allow the traffic across to the other leg. But, if they are on different subnets, they won’t be able to use the Internet through the 98 system.
      – Steve

    • June 26, 2000 at 7:21 am #3784902

      TCP/IP Forwading Help Needed

      by inspectorclave · about 24 years, 3 months ago

      In reply to TCP/IP Forwading Help Needed

      I would make your routing tables dynamic by installing RIP for IP on your server. Also, check to make sure that the subnet masks for the legs are correct. Follow this order from a PC in the non-functioning leg:
      1) Ping 127.0.0.1 -> if you don’t get a response, then TCP/IP is not configured properly on that machine.
      2) Ping IP address of a computer on the local subnet -> if you don’t get a response, check the cabling on the subnet and the switch.
      3) Ping IP address of the gateway for the subnet -> in you don’t get a response, then either the gateway IP address is bad, there is a duplicate IP address, the mask is wrong, or the gateway NIC is not working.
      4) Ping IP address of a computer on the other subnet -> in you don’t get a response then the gateway PC is not forwarding packets to the gateway NIC on the other subnet.

    • June 26, 2000 at 7:32 am #3784899

      TCP/IP Forwading Help Needed

      by calves · about 24 years, 3 months ago

      In reply to TCP/IP Forwading Help Needed

      I am somewhat confused by the question. If you have 2 subnets (legs) and you could be using real ip address, otherwise you would mention the router/firewall/proxy, or your are using a different protocol for the internal network (IPX/SPX or NetBEUI). If you’re using Ip you can use RRAS from Microsoft. If you’re using IPX, I don’t know what needs to be configured to allow the protocol to cross subnets and if you’re using NetBEUI you’re out of luck, for NetBEUI is not routable.
      RRAS is a programthat replaces your RAS and alows your NT machine to work as a router.
      I have some good links out of my Web page at http://www.softsolutionsconsult.com – network.
      Also, if you would like a proxy, check out
      http://www.jana-server.ocm.de/Englisch/FrameSet.htm for a free proxy software that also do the routing.

      Good luck!

    • June 27, 2000 at 7:20 am #3782693

      TCP/IP Forwading Help Needed

      by Anonymous · about 24 years, 3 months ago

      In reply to TCP/IP Forwading Help Needed

      Legs? There are legs all over this page from the advertising. Otherwise legs don’t mean anything in IP terms. You must tell us your IP scheme and topology. Hey a routing NT station with two subnets connected to one switch could create a routing loop. This is why we need a better understanding of your IPs and topology

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