Difference between revisions of "Cluster der kan alt/Routning og NAT"
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=Routning & NAT= | =Routning & NAT= | ||
| + | Configuring NAT (Sharing Internet) | ||
| + | |||
| + | For this, we do not need to install anything new. Everything is right there but is currently disabled. First, edit /etc/sysctl.conf. Find this: | ||
| + | #net.ipv4.ip_forward=1 | ||
| + | Uncomment it by removing the #. Now forwarding is enabled in the system kernel. | ||
| + | Now write: | ||
| + | iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE | ||
| + | What this does is make a NAT rule for post-routing. It sets the eth0 as the output card (The one out to the internet) and sets source to it's own IP through MASQUERADE. Then write: | ||
| + | echo 1 > /proc/sys/net/ipv4/ip_forward | ||
| + | This will enable it without a reboot. | ||
| + | Just to be sure, save it. | ||
| + | iptables-save > /etc/iptables.rules | ||
| + | Now that it’s saved we need to load the iptables.rules on starting the network: | ||
| + | vi /etc/network/interfaces | ||
| + | # The extended interfaces | ||
| + | auto eth0 | ||
| + | iface eth0 inet dhcp | ||
| + | pre-up iptables-restore < /etc/iptables.rules | ||
| + | post-down iptables-restore < /etc/iptables.rules | ||
| + | Test it out on your other client. | ||
Revision as of 14:25, 18 April 2012
Routning & NAT
Configuring NAT (Sharing Internet)
For this, we do not need to install anything new. Everything is right there but is currently disabled. First, edit /etc/sysctl.conf. Find this:
- net.ipv4.ip_forward=1
Uncomment it by removing the #. Now forwarding is enabled in the system kernel. Now write: iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE What this does is make a NAT rule for post-routing. It sets the eth0 as the output card (The one out to the internet) and sets source to it's own IP through MASQUERADE. Then write: echo 1 > /proc/sys/net/ipv4/ip_forward This will enable it without a reboot. Just to be sure, save it. iptables-save > /etc/iptables.rules Now that it’s saved we need to load the iptables.rules on starting the network: vi /etc/network/interfaces
- The extended interfaces
auto eth0 iface eth0 inet dhcp pre-up iptables-restore < /etc/iptables.rules post-down iptables-restore < /etc/iptables.rules Test it out on your other client.