IP routing/forwarding is disabled per default in Debian.
For enabling on the fly, you only have to write “1″ in /proc/sys/net/ipv4/ip_forward or to set the kernel parameter net.ipv4.ip_forward to “1″.
Method #1:
echo 1 > /proc/sys/net/ipv4/ip_forward
Method #2:
sysctl -w net.ipv4.ip_forward=1
The actual setting can be checked as following:
debian:~# sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1
debian:~# cat /proc/sys/net/ipv4/ip_forward
1
debian:~#
If you want permanent setting, the most [...]