Difference between revisions of "Cluster der kan alt/Routning og NAT"
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Configuring NAT (Sharing Internet) | 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: | + | ==Start Routing== |
| − | + | 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: | |
| + | <source lang=cli> | ||
| + | net.ipv4.ip_forward=1 | ||
| + | </source> | ||
Uncomment it by removing the #. Now forwarding is enabled in the system kernel. | Uncomment it by removing the #. Now forwarding is enabled in the system kernel. | ||
| − | + | ===Start routing without a reboot=== | |
| + | <source lang=cli> | ||
| + | echo 1 > /proc/sys/net/ipv4/ip_forward | ||
| + | </source> | ||
| + | This will enable it without a reboot. | ||
| + | |||
| + | ==NAT== | ||
| + | <source lang=cli> | ||
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE | iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE | ||
| + | </source> | ||
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: | 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: | ||
| − | |||
| − | |||
Just to be sure, save it. | Just to be sure, save it. | ||
| + | <source lang=cli> | ||
iptables-save > /etc/iptables.rules | iptables-save > /etc/iptables.rules | ||
| + | </source> | ||
Now that it’s saved we need to load the iptables.rules on starting the network: | Now that it’s saved we need to load the iptables.rules on starting the network: | ||
| − | + | ||
| + | edit the file '''/etc/network/interfaces''' | ||
| + | <source lang=cli> | ||
# The extended interfaces | # The extended interfaces | ||
auto eth0 | auto eth0 | ||
| Line 19: | Line 32: | ||
pre-up iptables-restore < /etc/iptables.rules | pre-up iptables-restore < /etc/iptables.rules | ||
post-down iptables-restore < /etc/iptables.rules | post-down iptables-restore < /etc/iptables.rules | ||
| + | </source> | ||
Test it out on your other client. | Test it out on your other client. | ||
| + | {{Source cli}} | ||
| + | [[Category:cluster]][[Category:Ubuntu]] | ||
Latest revision as of 14:31, 18 April 2012
Routning & NAT
Configuring NAT (Sharing Internet)
Start Routing
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=1Uncomment it by removing the #. Now forwarding is enabled in the system kernel.
Start routing without a reboot
echo 1 > /proc/sys/net/ipv4/ip_forwardThis will enable it without a reboot.
NAT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADEWhat 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: Just to be sure, save it.
iptables-save > /etc/iptables.rulesNow that it’s saved we need to load the iptables.rules on starting the network:
edit the file /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.rulesTest it out on your other client.