Difference between revisions of "Cluster der kan alt/Routning og NAT"

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m (Routning & NAT)
m (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:
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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:
  
vi /etc/network/interfaces  
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edit the file '''/etc/network/interfaces'''
</source lang=cli>
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<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}}
[[Categori:cluster]][[Categori:Ubuntu]]
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[[Category:cluster]][[Category:Ubuntu]]

Latest revision as of 13:31, 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=1

Uncomment it by removing the #. Now forwarding is enabled in the system kernel.

Start routing without a reboot

echo 1 > /proc/sys/net/ipv4/ip_forward

This will enable it without a reboot.

NAT

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: 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:

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.rules

Test it out on your other client.