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What communication can be intercepted by network I'm connected over VPN to?

tag-icon • tag-icon security vpn
What communication can be intercepted by network I'm connected over VPN to?

I have to connect to client's network over VPN, and I was wondering if the client can intercept (and read) my Google Talk messages (or any other IM communication) while I'm VPN-ing.

My main concern is them having access to our internal conversations.

Suggest workarounds if you have any.

答案1

That depends on how you route your internet connection. In most cases, you'll just route addresses from the client's network (typically in a subnet of 10.0.0.0/8).

Type route in a console to see your routing table. The first default entry determines how your regular internet connection flows. For example, the following configuration does route over the VPN:

0.0.0.0         172.16.0.5      0.0.0.0         tun0 # default via tun0(=VPN)
172.16.0.5      0.0.0.0         255.255.255.255 tun0
1.2.3.4         192.168.1.1     255.255.255.255 wlan0
192.168.1.0     0.0.0.0         255.255.255.0   wlan0
0.0.0.0         192.168.1.1     0.0.0.0         wlan0 # default via wlan0(local)

A simple alternative is checking whether your IP address changes when you connect to the VPN.

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