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I have a VPN connection and I want to make sure that all traffic use this VPN connection. I though of using iptables. ideas somebody? ten x

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please can you explain in your question why your question is different from this one? askubuntu.com/questions/26793/… – fossfreedom♦ Jun 5 '11 at 11:22
cause i dont like to use any program for that. – userAgent Jun 5 '11 at 11:30
eh? The "program" in the answer is just a GUI front end to iptables. – fossfreedom♦ Jun 5 '11 at 11:33

2 Answers

up vote 2 down vote

By running this script at startup i solved the problem explained in your post

# Delete all existing rules
iptables -F

# Allow from local network
iptables -A OUTPUT -d 192.168.2.0/24 -j ACCEPT
iptables -A OUTPUT -s 192.168.2.0/24 -j ACCEPT

# Allow OpenVPN
iptables -A OUTPUT -p udp --dport 1194 -j ACCEPT

# Deny eth0
iptables -A OUTPUT -o eth0 -j DROP
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up vote 1 down vote

You should set up a "default route" to send your TCP/IP traffic through the VPN. man route, netstat -rn. See also To allocate data usage efficiently with two internet connections

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