NetworkManager connection sharing + port forwarding

big_gie · 2013-10-16 16:38:12

Hi,

I connect to my wireless network through NetworkManager. In addition I have another computer connected to the first one through ethernet. I'm using NetworkManager to share the wireless connection of the first computer to the second one. Here's a diagram:

                Internet
                    |
                Wireless router (internal ip: 10.0.1.1)
                    |
                (Wifi)
                    |
Computer 1:     wlan0         eth0
                10.0.1.3      10.42.0.1
                                |
Computer 2:                   eth0
                              10.42.0.48

This setup works; Computer 2 has internet access. Additionally I can VNC or RDP from Computer 1 to 2.

Now I want to do some port forwarding so I can access the second computer from the wifi network (10.0.1.*), for example VNC (port 5900).

I couldn't find anything in NetworkManager to do that, so I tried iptables directly but without success. Here's an example of command I've tried (ran on Computer 1):

sudo iptables -A PREROUTING -t nat -i wlan0 -p tcp --dport 5900 -j DNAT --to 10.42.0.48:5900
sudo iptables -A FORWARD -p tcp -d 10.42.0.48 --dport 5900 -j ACCEPT

But this did not work, or anything else for that mater. To test, I run (on Computer 1):

vncviewer 10.0.1.3 ::5900

but I always get connection refused.

Any idea or suggestion as to how to setup iptables correctly?

Thanks!

Poco377 · 2014-02-22 01:22:50

I use Debian but I made an account on here to help you.

Try changing your "--to 10.42.0.48:5900" to '--to 10.42.0.48'

I'm also trying to setup IPTables, for my new servers in my case.

Arch Linux

#1 2013-10-16 16:38:12

NetworkManager connection sharing + port forwarding

#2 2014-02-22 01:22:50

Re: NetworkManager connection sharing + port forwarding

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