I run mpd on port 6680 in OPi

No problem if reaching in local network (localhost:6680)

Now I try to reach from internet, but verifying with http://www.yougetsignal.com/tools/open-ports/

port is still closed. I try forwarding all other port in OPi like sshd port 22 also closed

I'm pretty sure I set correctly port forwarding in my router because my NAS can work with same iptables rule. It seems something wrong in OPi setting, but couldn't find out what's wrong. Anybody help?

 

#iptables -L

Chain INPUT (policy ACCEPT)

target     prot opt source               destination

Chain FORWARD (policy ACCEPT)

target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)

target     prot opt source               destination

 

#netstat -l

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address           Foreign Address         State

tcp        0            0         *:6680                               *:*                     LISTEN

 

If you OPi doesn't act as a router between 2 ethernet ports, there is no reason to add port forwarding on the OPi.

If the OPi is inside your network and works perfectly from inside, then your issue is really on your external router.

1. port forwarding on OPI not needed ( see above post by @martinayotte )

2. Make sure OPI is defined with static IP in /etc/network/interfaces and use this IP to configure port forwarding on the router.

3. Restart router after configuration changes

 

 

Good luck.