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Using iptables to route OpenVPN traffic
To have your vpn traffic be able to reach the internet you just need to add the following iptable rules:
iptables -A FORWARD -i tun0 -j ACCEPT
iptables -A FORWARD -i tun0 -o eth0 -m state –state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i eth0 -o tun0 -m state –state RELATED,ESTABLISHED -j ACCEPT
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth0 -j MASQUERADE
This would take the tunnel adapter of tun0 and route the traffic through eth0 for the vpn subnet of 192.168.0.0.
Redetect Network Cards in CentOS 6
CentOS 6 keeps all of the information about the networking cards in udev. To have the system redetect the NIC cards all you need to do is delete the persistent-net.rules file and reboot. During boot the file will be regenerated with the new information.
rm /etc/udev/rules.d/70-persistent-net.rules
Next you should update the /etc/sysconfig/network-scripts/ifcfg-<adapter> scripts to contain the new MAC addresses and remove the UUID entries that will nto match if the cards changed.
Posted in CentOS, Linux
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Turn on IP Forwarding in Linux
By default for security reasons IP forwarding is turned off. If you are setting up a router or a vpn gateway you will need to turn it back on. You can just run the following command to turn it on.
echo 1 > /proc/sys/net/ipv4/ip_forward