enable port forwarding on ubuntu

check current value

sysctl net.ipv4.ip_forward

set to enabled

sudo sysctl net.ipv4.ip_forward=1

Persist across boots

sudo nano /etc/sysctl.conf

# Uncomment the next line to enable packet forwarding for IPv4
#net.ipv4.ip_forward=1

reference:

https://www.networkinghowtos.com/howto/enable-ip-forwarding-on-ubuntu-13-04/

--30--