HOWTO: open ports (for bittorrent?) from the command line

[Choad]

By default, ubuntu is totally locked down, and will not allow incoming connections. To rectify this, its very simple - just 1 command

sudo iptables -A INPUT -p tcp --dport 6881 -j ACCEPT

this is the port that the built in ubuntu bittorrent client uses, so this is the example i give. just issue that 1 command and you're good to go.

if you want to revert back to how it was before

sudo iptables -A INPUT -p tcp --dport 6881 -j DROP

i cant believe this hasnt already been posted

[&wi*m#~10+q]

thanx for the tip

[Draje]

Thanks, I also used it for ports 4662 & 4672 (aMule) and now KAD isn't firewalled anymore.

[stevieb]

holy crap! i've been trying for months to get this stuff (amule) working! you get my vote for 'post of the year'!

-steve=D>

[jake3988]

Thanks.

By the way, its good to hear that linux is completely shut-down by default. Most linux distros now-a-days are trying to open things up to make things 'easier' like windows does.

Glad this sticks to security!

Granted, my bittorrent by default worked before but had trouble uploading /well/, this might rectify this problem. Too bad the darned university won't let me torrent.

[amgeex]

Ok, I've done everything! I have forwarded the relevant ports in my router, I've opened the ports on ubuntu with the command above, and I added it to my iptables, so its permanent. When Deluge still insisted on reporting no incoming connections I decided to upgrade my router's firmware, but it didn't fix a thing. Right now I've got my computer on the DMZ Host of my router, and it STILL shows no incoming connections. What is happening?

[Choad]

Ok, I've done everything! I have forwarded the relevant ports in my router, I've opened the ports on ubuntu with the command above, and I added it to my iptables, so its permanent. When Deluge still insisted on reporting no incoming connections I decided to upgrade my router's firmware, but it didn't fix a thing. Right now I've got my computer on the DMZ Host of my router, and it STILL shows no incoming connections. What is happening?

trying to download a poorly seeded torrent?

[amgeex]

No, in fact, the torrent has 300+ seeds and 500+ peers, so no, its not poorly seeded.

[0MG]

Run a port scan on your self to see if the port is actually open. Also maybe try taking a look at the packets as they are trying to pass with wireshark or tshark. You might be able to find out what is stopping the packets that way.

[amgeex]

Thanks. I have scanned myself already, and the port is open. I will try to see the packets, which is something I haven't done. I'll post back to let you know.