Routing table in Windows 7 shows wrong metric

kljuka

My OpenVPN configuration work OK however my Windows 7 route seems to select a wrong interface for the network traffic.

Before using OpenVPN I have a route using my ethernet card with IP 192.168.10.39 (gateway 192.168.10.1).
As I connect to OpenVPN server (Ubuntu Linux) it assigns me (Windows 7) another IP 10.134.0.6. And OpenVPN client updates my Windows route so it looks the following (I copied only a small part):

Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0     192.168.10.1    192.168.10.39     25
          0.0.0.0        128.0.0.0       10.134.0.5       10.134.0.6     30
        128.0.0.0        128.0.0.0       10.134.0.5       10.134.0.6     30

If I traceroute google it uses my OpenVPN interface:

Tracing route to www.l.google.com [173.194.35.178]
over a maximum of 30 hops:
  1     4 ms     2 ms     2 ms  10.134.0.1
  2 ...

How does Windows 7 decide which interface to use for the internet traffic? OpenVPN interface has a metric of 30 which is higher than Ethernet interface (25) but it still gets chosen?!?

p.s.: I want OpenVPN to route all my traffic, but I don't understand how does Windows 7 decide which interface to use

Mimiko

First, you have to set in Network Configuration for the 192.168.10.39 adapter automatic metric.

Metric of the route is implied when same destination/mask network is the same, i.e.

0.0.0.0          0.0.0.0     192.168.10.1    192.168.10.39     25
0.0.0.0          0.0.0.0     192.168.11.1    192.168.11.39     26

In this case the default doute will be to 192.168.10.1 gateway, because destination and mask are the same.

In your case, even if metric is higher, 0.0.0.0/128.0.0.0 and 128.0.0.0/128.0.0.0 is a more specific route which take precedence over 0.0.0.0/0.0.0.0 route, Thats why packets are routed using this two route rules.