Linux NAT
This is a short howto for setting up Network Address Translation on a linux system (Debian was used for this howto)
Manually enable forwarding
$echo 1 > /proc/sys/net/ipv4/ip_forward
Enable forwarding aumatically at boot time
add the following in /etc/network/options
ip_forward=yes
Set up source NAT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE(replace eth0 by the interface connecting your Debian router to the Internet)
Additional steps
- Install DHCPD dhcpd selects interfaces from which it will broadcase DHCP offers according to the IP address of the interface. So, add an IP address to the Inner interface before starting dhcpd.
| Labels: unix, routing |
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