Difference between revisions of "Cluster der kan alt/Routning og NAT"
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==Start Routing== | ==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: | + | 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> | <source lang=cli> | ||
net.ipv4.ip_forward=1 | net.ipv4.ip_forward=1 | ||
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</source> | </source> | ||
This will enable it without a reboot. | This will enable it without a reboot. | ||
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==NAT== | ==NAT== | ||
<source lang=cli> | <source lang=cli> | ||
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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 | ||
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Test it out on your other client. | Test it out on your other client. | ||
{{Source cli}} | {{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.