ubuntu:networking:configuration:ip_forwarding
Table of Contents
Ubuntu - Networking - Configuration - IP Forwarding
IP forwarding is the ability for an operating system to accept incoming network packets on one interface, recognize that it is not meant for the system itself, but that it should be passed on to another network, and then forwards it accordingly.
Enable Port Forwarding Permanantly
Uncomment or add this line to /etc/sysctl.conf:
- /etc/sysctl.conf
net.ipv4.ip_forward=1
To enable the changes made in sysctl.conf, run:
sysctl -p
Enable IP Forwarding on the fly
To enable IP Forwarding, without rebooting the system:
sysctl -w net.ipv4.ip_forward=1
or
echo 1 > /proc/sys/net/ipv4/ip_forward
NOTE: The setting is changed instantly.
- However the result will not be preserved after rebooting the system.
Check if Port Forwarding is Enabled
cat /proc/sys/net/ipv4/ip_forward
returns:
1
NOTE:
- 0: Port forwarding is not enabled.
- 1: Port forwarding is enabled.
ubuntu/networking/configuration/ip_forwarding.txt · Last modified: 2021/07/26 12:19 by peter