Difference between revisions of "IP Forwarding and iptables configuration"
| Line 22: | Line 22: | ||
'''To delete an entry from the nat table''' <br> | '''To delete an entry from the nat table''' <br> | ||
| − | + | ||
iptables -t nat -L -n --line-numbers<br | iptables -t nat -L -n --line-numbers<br | ||
Revision as of 20:59, 19 February 2016
Forwarding must be enabled
root@raspbx:~# cat /proc/sys/net/ipv4/ip_forward
0
root@raspbx:~# sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1
root@raspbx:~# cat /proc/sys/net/ipv4/ip_forward
1
root@raspbx:~#
Routing and Masquerading
iptables --table nat --append POSTROUTING -o ppp0 -j MASQUERADE
iptables --append FORWARD -i eth0 -j ACCEPT
Forwarding traffic from one port to another machine and port
iptables -t nat -A PREROUTING -p tcp --dport 1111 -j DNAT --to-destination 2.2.2.2:1111
and finally, we ask IPtables to masquerade:
iptables -t nat -A POSTROUTING -j MASQUERADE
To delete an entry from the nat table
iptables -t nat -L -n --line-numbers<br
and find the line that matches the rules you want to deletes.
then
iptables -t nat -D
