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Thread: Windows route command for dual NIC

  1. #1
    Join Date
    Apr 2007
    Location
    Morrisville, NY
    Beans
    2,153

    Windows route command for dual NIC

    My primary NIC uses the 192.168.1.x address range from my home router. I'd like all 192.168.2.x traffic routed to my secondary NIC. I've tried a few route commands but no matter what I do when I activate the secondary NIC it "takes over" and I lose my Internet connection through the primary NIC. How can I properly add a route so only 192.168.2.x traffic goes through the secondary NIC?

    Code:
    ===========================================================================
    Interface List
     32...02 00 4c 4f 4f 50 ......Npcap Loopback Adapter
     29...00 1e e5 dc f8 e6 ......Microsoft Virtual WiFi Miniport Adapter #3
     28...00 1e e5 dc f8 e7 ......Linksys WUSB600N Dual-Band Wireless-N USB Network Adapter #
     13...00 ff a3 01 80 1f ......TAP-Win32 Adapter V9
     10...fc aa 14 55 18 79 ......Realtek PCIe GBE Family Controller
     14...0a 00 27 00 00 0e ......VirtualBox Host-Only Ethernet Adapter
      1...........................Software Loopback Interface 1
     34...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
     11...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
     24...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2
     26...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
     30...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #4
     25...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #5
     33...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #6
    ===========================================================================
    
    IPv4 Route Table
    ===========================================================================
    Active Routes:
    Network Destination        Netmask          Gateway       Interface  Metric
              0.0.0.0          0.0.0.0      192.168.1.1     192.168.1.12     20
          192.168.1.0    255.255.255.0         On-link      192.168.1.12    276
         192.168.1.12  255.255.255.255         On-link      192.168.1.12    276
        192.168.1.255  255.255.255.255         On-link      192.168.1.12    276
            224.0.0.0        240.0.0.0         On-link      192.168.1.12    276
      255.255.255.255  255.255.255.255         On-link      192.168.1.12    276
    ===========================================================================
    Persistent Routes:
      None
    
    IPv6 Route Table
    ===========================================================================
    Active Routes:
     If Metric Network Destination      Gateway
     28    276 fe80::/64                On-link
     28    276 fe80::9c20:1e22:891:24ee/128
                                        On-link
     28    276 ff00::/8                 On-link
    ===========================================================================
    Persistent Routes:
      None
    I want all 192.168.2.x traffic to go through the IP assigned to my secondary NIC 192.168.2.26.
    Code:
    C:\Windows\system32>route add 192.168.2.0 mask 255.255.255.0 192.168.2.26
    
    C:\Windows\system32>route print
    ===========================================================================
    Interface List
     32...02 00 4c 4f 4f 50 ......Npcap Loopback Adapter
     29...00 1e e5 dc f8 e6 ......Microsoft Virtual WiFi Miniport Adapter #3
     28...00 1e e5 dc f8 e7 ......Linksys WUSB600N Dual-Band Wireless-N USB Network Adapter #6
     13...00 ff a3 01 80 1f ......TAP-Win32 Adapter V9
     10...fc aa 14 55 18 79 ......Realtek PCIe GBE Family Controller
     14...0a 00 27 00 00 0e ......VirtualBox Host-Only Ethernet Adapter
      1...........................Software Loopback Interface 1
     34...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter
     11...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
     24...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2
     26...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
     30...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #4
     25...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #5
     33...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #6
    ===========================================================================
    
    IPv4 Route Table
    ===========================================================================
    Active Routes:
    Network Destination        Netmask          Gateway       Interface  Metric
              0.0.0.0          0.0.0.0      192.168.1.1     192.168.1.12     20
              0.0.0.0          0.0.0.0      192.168.2.1     192.168.2.26     10
          192.168.1.0    255.255.255.0         On-link      192.168.1.12    276
         192.168.1.12  255.255.255.255         On-link      192.168.1.12    276
        192.168.1.255  255.255.255.255         On-link      192.168.1.12    276
          192.168.2.0    255.255.255.0         On-link      192.168.2.26    266
         192.168.2.26  255.255.255.255         On-link      192.168.2.26    266
        192.168.2.255  255.255.255.255         On-link      192.168.2.26    266
            224.0.0.0        240.0.0.0         On-link      192.168.1.12    276
            224.0.0.0        240.0.0.0         On-link      192.168.2.26    266
      255.255.255.255  255.255.255.255         On-link      192.168.1.12    276
      255.255.255.255  255.255.255.255         On-link      192.168.2.26    266
    ===========================================================================
    Persistent Routes:
      None
    
    IPv6 Route Table
    ===========================================================================
    Active Routes:
     If Metric Network Destination      Gateway
     28    276 fe80::/64                On-link
     10    266 fe80::/64                On-link
     10    266 fe80::6996:c63:d3ab:68f1/128
                                        On-link
     28    276 fe80::9c20:1e22:891:24ee/128
                                        On-link
     28    276 ff00::/8                 On-link
     10    266 ff00::/8                 On-link
    ===========================================================================
    Persistent Routes:
      None
    I realize you only want 1 default gateway but it seems the route command doesn't let me define the interface if I don't include a default gateway.

  2. #2
    Join Date
    Nov 2007
    Location
    London, England
    Beans
    6,883
    Distro
    Xubuntu 19.10 Eoan Ermine

    Re: Windows route command for dual NIC

    I don't think the route command you show is creating the default route. I think DHCP is doing it when you connect the second interface up, along with the route that you are trying to add manually. And I notice that the second default has a lower metric, which makes it the preferred default route. I would be inclined to either delete the unwanted default route again, or add a new default route for the first interface with a lower metric again, e.g. "route add 0.0.0.0 mask 255.255.255.255 192.168.1.12 5".

  3. #3
    Join Date
    Apr 2007
    Location
    Morrisville, NY
    Beans
    2,153

    Re: Windows route command for dual NIC

    Quote Originally Posted by The Cog View Post
    I don't think the route command you show is creating the default route. I think DHCP is doing it when you connect the second interface up, along with the route that you are trying to add manually. And I notice that the second default has a lower metric, which makes it the preferred default route. I would be inclined to either delete the unwanted default route again, or add a new default route for the first interface with a lower metric again, e.g. "route add 0.0.0.0 mask 255.255.255.255 192.168.1.12 5".
    Wow...yes it was DHCP. I'm working on configuring a dd-wrt on the same model of my current home router and I had DHCP enabled. I turned off DHCP, set the IP address of my connecting NIC, and re-enabled it and it works now. No interruption to Internet-facing router. Thank you so much!

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