AFAIK UDP will not work. Read the docs about server tunnels or use I2CP. Both TCP based.

For IPv6 it should be sufficient to just let the router port through using a firewall rule. For SSU you will want to disable privacy extensions on your machine, making sure the outgoing address is the same one the router advertises. For IPv4 the port forwarding feature on most routers (not sure abou...

Actually there are 16 tunnels selectable in the UI. You can override through .i2p/i2ptunnel.config.d/. Some hundred client tunnels no problem. Perhaps you would want a performance mod.

256 MB for i2p are sufficient except you are running very high b/w. However older Java versions are known to allocate lots of memory outside the defined heap size over time. This has become increasingly better from Java 10 onwards. If possible run Java 11+. On linux use export MALLOC_ARENA_MAX=2 # 3...

Those of you following trac have seen me contributing to bug fixes and performance enhancements. These are crucial to me as I mainly use the ARM32 platform. I am glad of i2p progress over the last year, fixing many long standing issues. However I have developed some enhancements, most available on t...

A real bonus compared to other similar apps would be a "get info" feature. This would request metadata about a file from the sender to make a better decision whether to download. This could be the top dir listing for compressed files or the output of MediaInfoLib for music and videos.

When downloading the speed value jumps around and gives no indication when the download will finish. I would prefer "Estimated time of completion" calculated as "start time" + "time elapsed" * "total bytes" / "bytes transferred". This takes into acco...

Addition:

Of course the OP does not only work on Linux, but also on Mac, if you have Dev tools installed (no XCode necessary) and use HomeBrew to install ant and wget. Maybe fiddling with access rights is necessary. The resulting lib is libjbigi.jnilib.

The usual i2p setup is to sit behind an internet router and according to the docs use port forwarding to get traffic from your i2p peers to your local machine. So you create a rule to forward internet traffic on port 12345 to port 12345 on local machine 10.1.2.3. Simple and works most of the time. I...

Have fun. Remember to distribute torrents that share the same set of peers across instances for best performance. Example: When downloading or seeding four episodes of the same season, just run two of them in each instance. As long as you have spare disk space you can download faster by running two ...