Yes but how do you determine whether two servents are on the same local network.
You can't relay on the same IP range, they could be in two different networks. The only reliable way would be to use some multicast channel, which could also be used for a more efficient communication inside a local network.
Though there are many ideas to make this better and more efficient, we had no time and developers yet to implement this.

You need to change your network name to prevent external servents from connecting. You can do this through the Phex UI (Switch Network) or hard wire it in the PrivateNetworkConstants.

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