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Merge bitcoin/bitcoin#25993: doc: Add I2P guidance related to bandwidth and i2pd software version

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874c861885 doc: Add I2P bandwidth guidance to i2p.md (willcl-ark)

Pull request description:

  Add some general guidance on lowering bandwidth usage when using I2P routers.

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@ -133,3 +133,29 @@ listening port to 0 when listening for incoming I2P connections and advertises
its own I2P address with port 0. Furthermore, it will not attempt to connect to
I2P addresses with a non-zero port number because with SAM v3.1 the destination
port (`TO_PORT`) is always set to 0 and is not in the control of Bitcoin Core.
## Bandwidth
I2P routers may route a large amount of general network traffic with their
default settings. Check your router's configuration to limit the amount of this
traffic relayed, if desired.
With `i2pd`, the amount of bandwidth being shared with the wider network can be
adjusted with the `bandwidth`, `share` and `transittunnels` options in your
`i2pd.conf` file. For example, to limit total I2P traffic to 256KB/s and share
50% of this limit for a maximum of 20 transit tunnels:
```
bandwidth = 256
share = 50
[limits]
transittunnels = 20
```
If you prefer not to relay any public I2P traffic and only permit I2P traffic
from programs which are connecting via the SAM proxy, e.g. Bitcoin Core, you
can set the `notransit` option to `true`.
Similar bandwidth configuration options for the Java I2P router can be found in
`http://127.0.0.1:7657/config` under the "Bandwidth" tab.