/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
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.