Port forwarding without restarting the host system

[Rootinator]

Hello,

if I create a port forwarding in "/etc/network/interfaces", I have to reboot the entire host system every time, so that the changes take effect.

When I run "/etc/init.d/networking restart", the changes will not be applied live and all VM will be without Internet until the host system is restarted.

Is there a way to take port forwarding live without rebooting the host system?

 

[LnxBil]

If you show us what you did, we can help better. I assume it's iptables?

Generally, you can just run the commands you added manually on the console.

 

[Rootinator]

Yes, I use iptables for that.

I edit the "/etc/network/interfaces" and add the port forwarding rule at the end:

post-up iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 5678 -j DNAT --to 10.0.0.13:80
post-down iptables -t nat -D PREROUTING -i vmbr0 -p tcp --dport 5678 -j DNAT --to 10.0.0.13:80

Unfortunately I have to restart the host system after every change.

 

[LnxBil]

Unfortunately I have to restart the host system after every change.

As I wrote earlier, just run the post-up commands manually.

 

[Rootinator]

Is not it then that the commands are only temporary and are deleted after a restart of the host system?
At least that's what I thought, that would be the case with iptables (?)

 

[LnxBil]

Is not it then that the commands are only temporary and are deleted after a restart of the host system?

So? You asked how you can "take portforwarding live without a reboot" and just running the commands you added does exactly this. This is additional to adding port forwards to /etc/network/interfaces.