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Probably simple....resolving two NICS on server

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  • Probably simple....resolving two NICS on server

    Hello all. I am fairly new to new Server setups so this is probably something simple.

    I setup two new servers last week and they appear to work fine until I plugged them into their respective networks.
    Users can see the servers and login ok but the internet doesn't work.

    I can't get internet on the server either unless I disable the NIC that runs to the network.

    Any suggestions would be greatly appreciated as I've tried everything I can think of.

  • #2
    Re: Probably simple....resolving two NICS on server

    I assume from your title that you have 2 NICs on each server.
    How are they connected?
    What are the IP settings on each server / card?
    How are you connected to the internet / how are workstation connected?
    Give an IP setup from a workstation for comparison

    Tom
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

    ** Remember to give credit where credit is due and leave reputation points where appropriate **

    Comment


    • #3
      Re: Probably simple....resolving two NICS on server

      Yes, there are two NICS on each server.
      I should point out that these are two seperate locations and have nothing to do with the other.

      The setup is the same on each.

      My connection to the internet is on IP address 192.168.0.2 (NIC 1)
      the connection out to the networks is on 192.168.0.3 (NIC 2)

      the internet connection on each is via a router.

      The workstations connect via switches.
      There isn't a problem with the workstations seeing the server and obtaining an account. The problem is on the server itself.

      when both cards are enabled, my internet connection goes down. when I disable the card to the networks, it works fine.

      Comment


      • #4
        Re: Probably simple....resolving two NICS on server

        Originally posted by Gibbster
        My connection to the internet is on IP address 192.168.0.2 (NIC 1)
        the connection out to the networks is on 192.168.0.3 (NIC 2)
        Well I see a big issue right away. Both NICs are configured on the same subnet.

        Are you trying to setup the server as a gateway?

        You may want to read up on some things:
        http://support.microsoft.com/?kbid=164015
        http://computer.howstuffworks.com/router.htm/printable
        http://www.howstuffworks.com/nat.htm/printable
        http://technet2.microsoft.com/Window....mspx?mfr=true
        Regards,
        Jeremy

        Network Consultant/Engineer
        Baltimore - Washington area and beyond
        www.gma-cpa.com

        Comment


        • #5
          Re: Probably simple....resolving two NICS on server

          Must be a Gateway issue.
          MCSA, MCDST, MCP


          Ordinary Human in an Extra Ordinary World....

          Comment


          • #6
            Re: Probably simple....resolving two NICS on server

            Ok.... still having a problem with this.

            Internet Card IP: 192.168.1.5
            Gateway (router): 192.168.1.1
            DNS: 192.168.1.1


            Network Card IP: 192.168.1.6
            Gateway: 192.168.1.5
            DNS: 127.0.0.1


            The card to the network is for clients to connect to the server and subsequently to the internet.
            The server is setup as a DHCP server, DHCP has been disabled on the router.

            I've tried everything I can think of and having no luck.

            I can log into the server ok from the clients, the big issue is internet routing through these cards. Once I enable the network card, the internet doesn't work on the server machine anymore.

            Comment


            • #7
              Re: Probably simple....resolving two NICS on server

              Hey Gibbster. Let's see if we can clear up some things

              Could you post a drawing of your topology?

              I'll try and guess at your setup:

              -Clients are connected to a switch. We'll call it switch1
              -Server "Network Card" is also connected swtich1
              -Server "Internet Card" is connected to router which connects to Internet
              -You are trying to route Internet traffic through the Server

              Unknowns:
              -What OS is Server running?
              -Is the Server setup as a router?
              -Are there any other roles on the server? i.e. DNS, DC, file/print, etc.
              -Are you familiar with subnetting?
              Last edited by JeremyW; 31st August 2006, 23:26.
              Regards,
              Jeremy

              Network Consultant/Engineer
              Baltimore - Washington area and beyond
              www.gma-cpa.com

              Comment


              • #8
                Re: Probably simple....resolving two NICS on server

                Server is Server 2003

                Your guess on network topology is correct.
                Server is setup as a router
                server is also running DHCP, DC, DNS, File/Print sharing

                Subnetting I haven't played too much with.

                As of this afternoon, I was able to get a connection and the internet working.
                I setup the Gateway on the network NIC to 192.168.1.1 which is the same gateway on the Internet NIC and all seemed to work fine.

                My only issue now, is that DHCP doesn't seem to be working, I had to manually set an IP address on the workstation.
                Is this because I'm using the 192.168.1.x while the scope is set to 192.168.0.x ?

                It wouldn't allow me to change the scope to 1.x
                I guess it would be simple to change the router IP range to 0.x if need be.

                For now though, I am fine with setting static IP's

                Comment


                • #9
                  Re: Probably simple....resolving two NICS on server

                  Originally posted by Gibbster
                  Your guess on network topology is correct.
                  Server is setup as a router
                  server is also running DHCP, DC, DNS, File/Print sharing
                  Any other roles like Exchange or ISA? Is it Windows SBS?


                  As of this afternoon, I was able to get a connection and the internet working.
                  I setup the Gateway on the network NIC to 192.168.1.1 which is the same gateway on the Internet NIC and all seemed to work fine.
                  With the setup you describe, clients shouldn't be able to connect to the Internet. Is the router connected to the switch as well? Are you sure that the "Network Card" is 192.168.1.6 and not 192.168.0.6 or something like that?

                  My only issue now, is that DHCP doesn't seem to be working, I had to manually set an IP address on the workstation.
                  Is this because I'm using the 192.168.1.x while the scope is set to 192.168.0.x ?

                  It wouldn't allow me to change the scope to 1.x
                  I guess it would be simple to change the router IP range to 0.x if need be.
                  Try deleting the scope and then recreate it. But wait on doing this until we've sorted out how you're connecting to the Internet. (we will probably change your network subnet and maybe where you're plugging in the cables)

                  In addition to answering the above questions, on your server could you run
                  Code:
                  ipconfig /all
                  and post the results?
                  Regards,
                  Jeremy

                  Network Consultant/Engineer
                  Baltimore - Washington area and beyond
                  www.gma-cpa.com

                  Comment


                  • #10
                    Re: Probably simple....resolving two NICS on server

                    Ok......you jinxed it....LOL

                    Now I can't get internet on the Server or Workstations
                    It is not SBS. No Exchange, No ISA

                    What is the typical setup on a server machine with two NICS?

                    My Wireless router is IP: 192.168.1.1
                    that will run into the Internet NIC on the server.
                    Internet NIC will be 192.168.1.5
                    Internet NIC has to point to 192.168.1.1 as it's gateway to get the internet.


                    My Network NIC is IP 192.168.1.6

                    How do I set these cards so the server and clients get internet?
                    everything I've tried will seem to work one minute and not the next.

                    I'm tempted to plug the internet into the switch and bypass the server for net access altogether at this point.

                    Comment


                    • #11
                      Re: Probably simple....resolving two NICS on server

                      Originally posted by Gibbster
                      Ok......you jinxed it....LOL
                      Sorry but I like to keep things working logically

                      How do I set these cards so the server and clients get internet?
                      everything I've tried will seem to work one minute and not the next.

                      I'm tempted to plug the internet into the switch and bypass the server for net access altogether at this point.
                      Well unless you're looking for the server to be a firewall and/or you have IDS or IPS you don't need to run the traffic through the server. In fact, I think most people would not reccomend using a server for this purpose.

                      I would:
                      -disable one of the network cards on the server
                      -plug the other one into the switch
                      -plug the router into the switch
                      -make sure only one DHCP server is on the network (i.e. disable DHCP on either the server or the router). (you can delete and recreate the DHCP scope if need be)

                      After doing the above I believe that clients and server should be connected to each other and the Internet.

                      In my suggestion above, I'm making some assumptions judging by the "Wireless router" comment:
                      -It has certain firewall capabilities
                      -It has DHCP server capabilities

                      Please correct any assumptions. Also, knowing the router model would be helpful.
                      Regards,
                      Jeremy

                      Network Consultant/Engineer
                      Baltimore - Washington area and beyond
                      www.gma-cpa.com

                      Comment


                      • #12
                        Re: Probably simple....resolving two NICS on server

                        OK.....bypassing the server is do-able....... disappointing but do-able.
                        I had been hoping to control everything through the server.

                        If I eliminated the router and ran it through the Server...how would I do this?

                        This is my current setup (sans router)

                        =============================
                        Adapter: Internet
                        Netcard Queries Test.......passed
                        Hostname.........GGCServer
                        IPAddress..........192.168.4.43
                        Subnet Mask......255.255.255.0
                        Default Gateway........192.168.4.254
                        DNS Servers.........204.50.96.7
                        .........204.50.96.8
                        =============================

                        Adapter: Network
                        Netcard Queries Test........passed
                        Hostname........GGCServer
                        IPAddress.........192.168.0.2
                        Subnet Mask........255.255.255.0
                        Default Gateway........192.168.4.43
                        DNS Server.........127.0.0.1
                        =============================


                        This would make it a lot easier to manage with everything running through one single connection.
                        Router is a LinkSys WRT54G

                        Comment


                        • #13
                          Re: Probably simple....resolving two NICS on server

                          Alright, now I have more questions.

                          Originally posted by Gibbster
                          OK.....bypassing the server is do-able....... disappointing but do-able.
                          I had been hoping to control everything through the server.
                          Well we can have it go through the server but there's no point in doing so. All it would do is put more strain on the server. What control are you looking to gain by having it go through the server?

                          If I eliminated the router and ran it through the Server...how would I do this?
                          You would need to put your internal network ("Network Card") on a different subnet than the external network ("Internet Card") i.e. change the internal subnet to 192.168.0.x. The reasons I'm not gonna go into but you can read about them in the links I posted earlier in this thread.

                          This is my current setup (sans router)

                          =============================
                          Adapter: Internet
                          Netcard Queries Test.......passed
                          Hostname.........GGCServer
                          IPAddress..........192.168.4.43
                          Subnet Mask......255.255.255.0
                          Default Gateway........192.168.4.254
                          DNS Servers.........204.50.96.7
                          .........204.50.96.8
                          =============================

                          Adapter: Network
                          Netcard Queries Test........passed
                          Hostname........GGCServer
                          IPAddress.........192.168.0.2
                          Subnet Mask........255.255.255.0
                          Default Gateway........192.168.4.43
                          DNS Server.........127.0.0.1
                          =============================
                          This is different than any information you've given previously. What device does this information belong to? What do you mean by "sans router"?


                          This would make it a lot easier to manage with everything running through one single connection.
                          How so?

                          Is there anything else you'd like to mention about your setup that would help in getting straightened out?
                          Regards,
                          Jeremy

                          Network Consultant/Engineer
                          Baltimore - Washington area and beyond
                          www.gma-cpa.com

                          Comment


                          • #14
                            Re: Probably simple....resolving two NICS on server

                            LOL...this is all so confusing huh?

                            sans router = no router hence the different IP configurations.

                            The main problem I have when placing two seperate subnets in the Server is that it tells me it won't work properly.
                            I wanted it setup with the server only simply for ease of understanding.

                            I set it all up with the router running directly into the switch and all works fine. I recreated the Scope with WINS enabled (it was previously reporting no WINS server)

                            It works now......I'm going to leave it at that....this has been too much of a headache.

                            Time to get my MCSE.....

                            Thanks for your help and sorry about the grey hairs.

                            ( I would still like to understand how to set it up without the router for future consideration though)

                            Comment


                            • #15
                              Re: Probably simple....resolving two NICS on server

                              Originally posted by Gibbster
                              Time to get my MCSE.....

                              Thanks for your help and sorry about the grey hairs.

                              ( I would still like to understand how to set it up without the router for future consideration though)
                              Good plan. A firm understanding of subnetting would've saved you tons of confusion. Therefore I reiterate:
                              http://support.microsoft.com/?kbid=164015
                              http://computer.howstuffworks.com/router.htm/printable
                              http://www.howstuffworks.com/nat.htm/printable
                              http://technet2.microsoft.com/Window....mspx?mfr=true

                              And if you're looking for a good book
                              http://www.microsoft.com/MSPress/books/5433.asp

                              Happy learning!
                              Regards,
                              Jeremy

                              Network Consultant/Engineer
                              Baltimore - Washington area and beyond
                              www.gma-cpa.com

                              Comment

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