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Déjà vu
Asked: 2015-09-18 18:41:30 +0800 CST

OpenVPN: routing to two VPNs

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Using Ubuntu 14.04 (up to date).

I'd like to use two VPNs (openvpn) a the same time.
LAN is: 10.1.1.0/24

The 1st VPN, homemade, is only routing the 192.168.1.0/24 network via the tunnel.

Routes table before VPN1 is started

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.1.1.1        0.0.0.0         UG    0      0        0 eth0
10.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0

Routes table after VPN1 is started

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.1.1.1        0.0.0.0         UG    0      0        0 eth0
10.14.0.0       10.14.0.2       255.255.255.0   UG    0      0        0 tun0
10.14.0.2       0.0.0.0         255.255.255.255 UH    0      0        0 tun0
10.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.88.0.1       10.88.0.5       255.255.255.255 UGH   0      0        0 tun1
10.88.0.5       0.0.0.0         255.255.255.255 UH    0      0        0 tun1
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
192.168.1.0     10.88.0.5       255.255.255.0   UG    0      0        0 tun1

The problem is after starting the 2nd VPN (from PIA), which installs a default route, the 192.168.1.0 subnet is not routed anymore. (The rest is working).

For instance, doing a ping to 192.168.1.1 works fine until the 2nd VPN becomes active.

Routes table after VPN2 is started

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.182.1.5      128.0.0.0       UG    0      0        0 tun2
0.0.0.0         10.1.1.1        0.0.0.0         UG    0      0        0 eth0
10.14.0.0       10.14.0.2       255.255.255.0   UG    0      0        0 tun0
10.14.0.2       0.0.0.0         255.255.255.255 UH    0      0        0 tun0
10.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.88.0.1       10.88.0.5       255.255.255.255 UGH   0      0        0 tun1
10.88.0.5       0.0.0.0         255.255.255.255 UH    0      0        0 tun1
10.182.1.1      10.182.1.5      255.255.255.255 UGH   0      0        0 tun2
10.182.1.5      0.0.0.0         255.255.255.255 UH    0      0        0 tun2
128.0.0.0       10.182.1.5      128.0.0.0       UG    0      0        0 tun2
161.202.72.156  10.1.1.1        255.255.255.255 UGH   0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
192.168.1.0     10.88.0.5       255.255.255.0   UG    0      0        0 tun1

However, and this is what I don't understand, the 192.168.1.0 route is still alive, and is way more specific than the default routes. There doesn't seem to be any conflicting internal openvpn tunnel routes.

Is this 192.168.1.0 routing problem fixable, having the two VPNs running at the same time?

routing

0 Answers