Windows 7 Set metric to use 2 different network interfaces at the same time

lannetworkingroutingwindows 7wireless-networking

I'm looking for a way to use at the same time wired and wireless interfaces.

My situation:

1 Gbit ethernet interface (10.100.x.x)
1 WiFi 802.11 b/g/n interface (192.168.x.x)
The PC is part of a domain (10.100.x.x) and I logon using a LDAP user.

I want to use the Ethernet interface to connect to the domain and navigate through LAN, but every time I need to access the internet, I want to use the WiFi.

The Ethernet interface is configured for the domain, so there's a DHCP that assigns every setting, from PC IP address to default gateway IP and DNS.

I tried almost everything…

"Advanced settings" on "Network Connection Panel" to change the
interfaces order.
Route table to adjust interfaces and gateways metrics.
"Network Adapter Advanced Settings" to uncheck the automatic metric
and set a manual value.

When both my interfaces are activated this is my Route table:

IPv4 Tabella route
===========================================================================
Route attive:
     Indirizzo rete             Mask          Gateway     Interfaccia Metrica
          0.0.0.0          0.0.0.0       10.100.1.1      10.100.1.55    276
          0.0.0.0          0.0.0.0     192.168.10.1   192.168.10.208    281
       10.100.1.0    255.255.255.0         On-link       10.100.1.55    276
      10.100.1.55  255.255.255.255         On-link       10.100.1.55    276
     10.100.1.255  255.255.255.255         On-link       10.100.1.55    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
     192.168.10.0    255.255.255.0         On-link    192.168.10.208    281
   192.168.10.208  255.255.255.255         On-link    192.168.10.208    281
   192.168.10.255  255.255.255.255         On-link    192.168.10.208    281
    192.168.184.0    255.255.255.0         On-link     192.168.184.1    276
    192.168.184.1  255.255.255.255         On-link     192.168.184.1    276
  192.168.184.255  255.255.255.255         On-link     192.168.184.1    276
    192.168.222.0    255.255.255.0         On-link     192.168.222.1    276
    192.168.222.1  255.255.255.255         On-link     192.168.222.1    276
  192.168.222.255  255.255.255.255         On-link     192.168.222.1    276
        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     192.168.222.1    276
        224.0.0.0        240.0.0.0         On-link     192.168.184.1    276
        224.0.0.0        240.0.0.0         On-link       10.100.1.55    276
        224.0.0.0        240.0.0.0         On-link    192.168.10.208    281
  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     192.168.222.1    276
  255.255.255.255  255.255.255.255         On-link     192.168.184.1    276
  255.255.255.255  255.255.255.255         On-link       10.100.1.55    276
  255.255.255.255  255.255.255.255         On-link    192.168.10.208    281
===========================================================================
Route permanenti:
  Nessuna

The best I was able to obtain was to set a manual metric value to the Ethernet interface so the metric of gateway increased till a value greater than the WiFi gateway. This way lead me to gain access to the Internet by the WiFi gateway (as I wanted) BUT I loose my network connections access so I cannot access my domain resources (server, shares, printers…).

Using the procedure described above I finally have this Route table:

IPv4 Tabella route
===========================================================================
Route attive:
     Indirizzo rete             Mask          Gateway     Interfaccia Metrica
          0.0.0.0          0.0.0.0       10.100.1.1      10.100.1.55    356
          0.0.0.0          0.0.0.0     192.168.10.1   192.168.10.208    281
       10.100.1.0    255.255.255.0         On-link       10.100.1.55    356
      10.100.1.55  255.255.255.255         On-link       10.100.1.55    356
     10.100.1.255  255.255.255.255         On-link       10.100.1.55    356
        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
     192.168.10.0    255.255.255.0         On-link    192.168.10.208    281
   192.168.10.208  255.255.255.255         On-link    192.168.10.208    281
   192.168.10.255  255.255.255.255         On-link    192.168.10.208    281
    192.168.184.0    255.255.255.0         On-link     192.168.184.1    276
    192.168.184.1  255.255.255.255         On-link     192.168.184.1    276
  192.168.184.255  255.255.255.255         On-link     192.168.184.1    276
    192.168.222.0    255.255.255.0         On-link     192.168.222.1    276
    192.168.222.1  255.255.255.255         On-link     192.168.222.1    276
  192.168.222.255  255.255.255.255         On-link     192.168.222.1    276
        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     192.168.222.1    276
        224.0.0.0        240.0.0.0         On-link     192.168.184.1    276
        224.0.0.0        240.0.0.0         On-link       10.100.1.55    356
        224.0.0.0        240.0.0.0         On-link    192.168.10.208    281
  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     192.168.222.1    276
  255.255.255.255  255.255.255.255         On-link     192.168.184.1    276
  255.255.255.255  255.255.255.255         On-link       10.100.1.55    356
  255.255.255.255  255.255.255.255         On-link    192.168.10.208    281
===========================================================================
Route permanenti:
  Nessuna

Here the WiFi gateway (192.168.x.x) has lower metrics than ethernet one, so I can go to the WAN with that but I cannot access my network resources anymore.
It seems that with that route table, every LAN connection tries to pass through WiFi interface.
I tried to change and delete the 0.0.0.0 0.0.0.0 10.100.1.1 10.100.1.55 276 route but nothing appened…

Best Answer

Try these two commands:

route delete 0.0.0.0 10.100.1.1

route add 10.0.0.0 mask 255.0.0.0 10.100.1.1

If that works, put them in a batch file in your StartUp folder to automatically run every time you log in. This should do the job.

Related Solutions

Linux – Routing all traffic over VPN on Ubuntu Linux

Your local network is 192.168.1.0/24, as shown by this line in your routing table:

 192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.32  metric 1

Your VPN network is 10.0.0.0/8, as shown by this line:

 10.0.0.0/8 dev tun0  scope link

Currently, your default router is:

 default via 192.168.1.254 dev eth0  proto static

which is of course what you do not want, because it belongs to your local LAN: thus all of your stuff is routed through your local gateway, as if the VPN did not exist.

 You do have however, the all-important statement

 128.122.252.68 via 192.168.1.254 dev eth0  src 192.168.1.32

which is the route to your VPN-provider.

EDIT:

I had not realized that the routing table is simply the one that is obtained from your VPN, without your intervention. This may indicate (indirectly) that your service provider is willing to forward only the traffic explicitly allowed in your table through the interface tun0, and may have taken further steps to block all other traffic, in which case your efforts will be futile.

However, assuming that your provider is willing to forward all of your traffic, what you need to do is the following.

First, you need to find out whether there is a gateway willing to accept your connection on the other side, because we need its IP address. I will give you four methods to do this.

1) With the pc connected to the VPN, try the following command:

   sudo dhclient -v tun0

If everything goes well, you should see a reply containing this line:

 DHCPOFFER of a.b.c.d from x.y.w.z

x.y.w.z is the IP address of the local gateway. You may have to shutdown your VPN after this test, and maybe even to reboot your pc, because we will have just messed up the routing table pretty well.

2) Alternatively, you may try navigating to one of the allowed sites (those that appear in your routing table as going through the tun0 interface), then issuing the command:

  ip neigh show

You should get a list of pcs contacted through the ARP protocol, with MAC and IP address; most likely, you will receive either zero or one reply. If you get a single reply, then that's your router.

3) If you get no such reply, then you may try with

  sudo nmap -sn 10.0.0.0/8

(which is going to be very slow). Your gateway will be one of the pcs listed, most likely the one with address ending in .1 or in .254, if any such exist.

4) Use the tcpdump command:

  sudo tcpdump -n -i tun0

and see the IP addresses spewed out by the command.

If you get no proper reply to this test either, it means someone has really tightened the screws in his network.

But let us be optimistic, and suppose you now have a candidate IP address x.w.y.z for the remote router. You will need to delete the default gateway, (as sudo!):

  ip route del default via 192.168.1.254

an add the new one:

  ip route add default via x.w.y.z

and try to navigate.

Let me repeat: since your provider has allowed traffic only to a few selected IP addresses through his VPN, it is possible he may have taken extra measures (=firewall) to prevent a smart user to force his generic traffic through his VPN. In this case, there is nothing you can do. But if he did not, the above steps should help you find a solution.

Best Answer

Related Solutions

Linux – Routing all traffic over VPN on Ubuntu Linux

Related Question