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Which I2P ports one needs to open/forward? (lemmings.world)
submitted 7 months ago by to c/i2p@lemmy.world
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/etc/i2pd/i2pd.conf contains number of listening ports configuration (actually 10 or more when you look for "port"). Which ones should I open in firewall so other people can connect my node? Excluding ones that are meant for management of my node. I manage the node only locally.

So far I have only open/forwarded one port, one that is set a few lines below the line "## Port to listen for connections" that certainly allows relaying traffic for other I2P peers per the http://127.0.0.1:7070/ traffic stats.

Services HTTP Proxy	Enabled
SOCKS Proxy	Enabled
BOB	Disabled
SAM	Enabled
I2CP	Enabled
I2PControl	Disabled

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[–] 4 points 7 months ago

That one thats labled "Port to listen for connections" is the only one you need to forward, uncomment it and set it to a random number between 1025-65535, then just port forward the port you chose, and restart, and you should be good to go. If everything is working, you should see "Network Status: OK" in your webconsole. Also dont tell anyone the port you chose, it can be used to single out your router

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    [–] 2 points 7 months ago

    i2p selects a random UDP+TCP port on first start that you have to open, the rest are usually only for internal use.

    I have never used i2pd, but I think i2pd port should print which port it expects to be open. Alternatively you can set it yourself with i2pd port (your port)

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    [–] 1 point 7 months ago (2 children)

    There is no requirement forward any ports

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  • [–] [S] 1 point 7 months ago* (1 child)

    "Set a port and forward it to your i2pd instance in your router or (if available) use UPnP" https://github.com/PurpleI2P/i2pd/issues/1694 "If a static IP address is available, you need to either forward the port on your router or enable UPnP on it. i2pd supports UPnP and can open the port when the program starts." https://github.com/PurpleI2P/i2pd/issues/1650 (machine translated, member of a PurpleI2P)

    If UPnP is enabled on router and he is firewalled (I2P reports that), then IMO he should try forwarding that port traffic on the router to his LAN IP. But I have not and seen no proof that would show if firewalled and non firewalled makes any difference in I2P. In bittorrent it makes significant difference, it allows peers behind NAT to interconnect and bittorrent is using at least one technique to workaround peer connections behind NAT (but can still fail to establish connections between two passive/firewalled peers).

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  • [–] 1 point 7 months ago

    Port forwarding does help. The problem is that you have forward the right ports. If you don't don't know what you are doing it is easy to accidentally forward the management interface which is a major security risk.

    Honesty port forwarding is only really needed because of NAT. If you can get native IPv6 is way better

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    • [–] 1 point 7 months ago*

    None are required, and it's intentionally randomized and supposed to be handled through uPnP. That said, as far as I know it's only listed on your router's Config -> Network page. None of the ports actually listed in i2pd.conf are the ones you need, although if you need to make it fixed and manually specify a port, look for the one that says it is "randomized by default" and uncomment it to put your own randomly chosen port there. Do not use the default port from the config, it's intentionally supposed to be unpredictable.

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