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Internet does not work when I enabled my local Network

    Question

  • We have windows 2008 R2 installed in our server. I am facing strange kind of problem with it. It has two LAN installed one LAN we are using for internet connectivity (WAN) other one we are using for local network connectivity & my issue is thatwhenever i enabled both lan than internet does not work & if I disabled my local netowork than internet started working.

    we have the following network setup:

    A) Router IP 192.168.51.49
    B) Windows Server 2008 R2 with dual NIC:
        Lan A) WAN interface (192.168.51.50) ( Used for internet)
        Lan B) LAN interface (192.168.30.228) ( used for local connectivity )
    

    When i keep both LAN Enabled than my internet doesn't work, but if I disabled my local Lan than internet working fine.

    so please help me how can resolved this issue or should i need to do routing on my server

    Please find the below attached route print result

    C:\Users\Administrator>route print
    ===========================================================================
    
    IPv4 Route Table
    ===========================================================================
    Active Routes:
    Network Destination        Netmask          Gateway       Interface  Metric
               0.0.0.0          0.0.0.0     192.168.51.49     192.168.51.50    276
               0.0.0.0          0.0.0.0    192.168.30.227    192.168.30.228    266
        192.168.30.224  255.255.255.240         On-link      192.168.30.228    266
        192.168.30.228  255.255.255.255         On-link      192.168.30.228    266
        192.168.30.239  255.255.255.255         On-link      192.168.30.228    266
         192.168.51.48  255.255.255.240         On-link       192.168.51.50    276
         192.168.51.50  255.255.255.255         On-link       192.168.51.50    276
         192.168.51.63  255.255.255.255         On-link       192.168.51.50    276
             127.0.0.0        255.0.0.0         On-link           127.0.0.1    306
             127.0.0.1  255.255.255.255         On-link           127.0.0.1    306
       127.255.255.255  255.255.255.255         On-link           127.0.0.1    306
          202.56.230.5  255.255.255.255     192.168.51.49     192.168.51.50     21
          202.56.230.6  255.255.255.255     192.168.51.49     192.168.51.50     21
        192.168.26.124  255.255.255.255     192.168.51.49     192.168.51.50     21
             224.0.0.0        240.0.0.0         On-link           127.0.0.1    306
             224.0.0.0        240.0.0.0         On-link       192.168.51.50    276
             224.0.0.0        240.0.0.0         On-link      192.168.30.228    266
       255.255.255.255  255.255.255.255         On-link           127.0.0.1    306
       255.255.255.255  255.255.255.255         On-link       192.168.51.50    276
       255.255.255.255  255.255.255.255         On-link      192.168.30.228    266
    ===========================================================================
    Persistent Routes:
      Network Address          Netmask  Gateway Address  Metric
              0.0.0.0          0.0.0.0    192.168.30.227  Default
              0.0.0.0          0.0.0.0     192.168.51.49  Default
    ===========================================================================
    

    Rakesh Kumar

    Monday, October 21, 2013 11:27 AM

Answers

  • You have two NICs and two gateways, one on each NIC:

      0.0.0.0          0.0.0.0     192.168.51.49     192.168.51.50    276
      0.0.0.0          0.0.0.0    192.168.30.227    192.168.30.228    266

    and

    Persistent Routes:
      Network Address          Netmask  Gateway Address  Metric
              0.0.0.0          0.0.0.0    192.168.30.227  Default
              0.0.0.0          0.0.0.0     192.168.51.49  Default

    -

    Rule of thumb - any machine must ONLY have ONE default gateway

    The outer NIC's gateway must be blank. Looking at the two IP addresses, I have no idea which one is the outer NIC.

    Are you running NAT?


    Ace Fekay
    MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services
    Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

    This post is provided AS-IS with no warranties or guarantees and confers no rights.

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    • Marked as answer by Rakeshyadav Tuesday, October 29, 2013 5:07 AM
    Tuesday, October 22, 2013 2:38 AM
  • As I said, any machine (Windows, Unix, Linux, etc), can ONLY have one gateway. The "gateway" is the "doorway" out to the world. In situations like your setup, the gateway can only be on the outside interface. The inside does not need one because the outside interface tell the machine which way is out.

    I assume the Notes server is on either the 192.168.30.0/24 or 192.168.51.0/24 network. So for example, if the Notes server is on the 192.168.51.0/24 subnet, then that interface on the server does not need a gateway, and what you would simply do is specific the actual IP of the server's interface on 192.168.51.0/24  as the gateway address on the Notes server.

    Frankly, and honestly, this is simple network. Here is an example of how it works. In this example, substitute DC1 as the Notes server. And of course, and *assuming* that you are using NAT, you would create port translations in RRAS (TCP 25 for SMTP, etc) for the Notes server so any outside request hitting the outside interface would translate that inwards.


    Ace Fekay
    MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services
    Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

    This post is provided AS-IS with no warranties or guarantees and confers no rights.

    FaceBook Twitter LinkedIn

    Tuesday, October 22, 2013 2:22 PM
  • Hi,

    Thanks for your suggestion after deleting the default route of local network  I was able to connect with both the network & internet also.


    Rakesh Kumar

    • Marked as answer by Rakeshyadav Tuesday, October 29, 2013 5:07 AM
    Tuesday, October 29, 2013 5:07 AM

All replies

  • Does this thread help?

    http://social.technet.microsoft.com/Forums/en-US/decf7888-4564-4f83-83ae-dee0e3f5d5a0/title-windows-2003-and-two-nics-one-for-external-traffic-and-one-for-internal-traffic

    Monday, October 21, 2013 3:11 PM
  • You have two NICs and two gateways, one on each NIC:

      0.0.0.0          0.0.0.0     192.168.51.49     192.168.51.50    276
      0.0.0.0          0.0.0.0    192.168.30.227    192.168.30.228    266

    and

    Persistent Routes:
      Network Address          Netmask  Gateway Address  Metric
              0.0.0.0          0.0.0.0    192.168.30.227  Default
              0.0.0.0          0.0.0.0     192.168.51.49  Default

    -

    Rule of thumb - any machine must ONLY have ONE default gateway

    The outer NIC's gateway must be blank. Looking at the two IP addresses, I have no idea which one is the outer NIC.

    Are you running NAT?


    Ace Fekay
    MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services
    Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

    This post is provided AS-IS with no warranties or guarantees and confers no rights.

    FaceBook Twitter LinkedIn

    • Marked as answer by Rakeshyadav Tuesday, October 29, 2013 5:07 AM
    Tuesday, October 22, 2013 2:38 AM
  • Hi,

    This server is our notes traveler server which will we accessed by our IPhone users from outside (Internet) . This server has two Lan because LAN A is connected with Internet (leased line) & Lan B we used to connect our notes server (Local Connectivity). If we will not use default Gateway of internet Line than we will not able to access the internet & if we will not use gateway of local network than we will not able to connect our notes server. Thats why we are using two default gateway.


    Rakesh Kumar


    • Edited by Rakeshyadav Tuesday, October 22, 2013 9:35 AM
    Tuesday, October 22, 2013 5:49 AM
  • As I said, any machine (Windows, Unix, Linux, etc), can ONLY have one gateway. The "gateway" is the "doorway" out to the world. In situations like your setup, the gateway can only be on the outside interface. The inside does not need one because the outside interface tell the machine which way is out.

    I assume the Notes server is on either the 192.168.30.0/24 or 192.168.51.0/24 network. So for example, if the Notes server is on the 192.168.51.0/24 subnet, then that interface on the server does not need a gateway, and what you would simply do is specific the actual IP of the server's interface on 192.168.51.0/24  as the gateway address on the Notes server.

    Frankly, and honestly, this is simple network. Here is an example of how it works. In this example, substitute DC1 as the Notes server. And of course, and *assuming* that you are using NAT, you would create port translations in RRAS (TCP 25 for SMTP, etc) for the Notes server so any outside request hitting the outside interface would translate that inwards.


    Ace Fekay
    MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services
    Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

    This post is provided AS-IS with no warranties or guarantees and confers no rights.

    FaceBook Twitter LinkedIn

    Tuesday, October 22, 2013 2:22 PM
  • Hi,

    Thanks for your suggestion after deleting the default route of local network  I was able to connect with both the network & internet also.


    Rakesh Kumar

    • Marked as answer by Rakeshyadav Tuesday, October 29, 2013 5:07 AM
    Tuesday, October 29, 2013 5:07 AM
  • Good to hear!

    Ace Fekay
    MVP, MCT, MCITP/EA, MCTS Windows 2008/R2 & Exchange 2007, Exchange 2010 EA, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services
    Technical Blogs & Videos: http://www.delawarecountycomputerconsulting.com/

    This post is provided AS-IS with no warranties or guarantees and confers no rights.

    FaceBook Twitter LinkedIn

    Tuesday, October 29, 2013 4:31 PM