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

  1. #1
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    Ubuntu 10.04 Lucid Lynx

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

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

    Code:
    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

    Code:
    sudo iptables -A INPUT -p tcp --dport 6881 -j DROP
    i cant believe this hasnt already been posted
    Last edited by Choad; January 11th, 2007 at 12:55 PM. Reason: added some tags
    sudo make me a sandwich

  2. #2
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    Hardy Heron (Ubuntu Development)

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

    thanx for the tip

  3. #3
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    Re: HOWTO: open ports (for bittorrent?) from the command line

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

  4. #4
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    Re: HOWTO: open ports (for bittorrent?) from the command line

    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>
    Registered Ubuntu User #6991, Registered Linux User #424168

  5. #5
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    Re: HOWTO: open ports (for bittorrent?) from the command line

    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.

  6. #6
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    Ubuntu 7.04 Feisty Fawn

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

    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?

  7. #7
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    Re: HOWTO: open ports (for bittorrent?) from the command line

    Quote Originally Posted by amgeex View Post
    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?
    sudo make me a sandwich

  8. #8
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    Re: HOWTO: open ports (for bittorrent?) from the command line

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

  9. #9
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    Re: HOWTO: open ports (for bittorrent?) from the command line

    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.

  10. #10
    Join Date
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    Ubuntu 7.04 Feisty Fawn

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

    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.

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