[tor-relays] 4 relays per IP address are allowed from now (Feb 2023) on

[Georg Koppen]

Hello everyone!

You might recall that Tor is restricting the possible amount of Tor 
relays per IP address to 2, mainly for Sybil prevention reasons.[1] 
Given that Tor on the relay side at least is not multithreaded yet (and 
will likely not be for the near and medium future) that's wasting a lot 
of useful resources as many servers can easily handle more than 2 
relays. Additionally, IPv4 addresses are scarce/expensive.

I have good news for you, though. Thanks to a push by our relay operator 
community we raised that limit to 4 with the help of the directory 
authorities (by having set `AuthDirMaxServersPerAddr 4` on a majority of 
them) and, depending on how that experiment goes, consider raising it 
even to 8.

Thus from now one should be able to run 4 relays per IP address. We are 
looking very much forward to seeing a bunch of additional relays 
entering the network and making it stronger. :)

For more details, information and discussion see: tor#40744.[2]

Thanks,
Georg

[1] 
https://gitlab.torproject.org/tpo/core/torspec/-/blob/main/proposals/109-no-sharing-ips.txt
[2] https://gitlab.torproject.org/tpo/core/tor/-/issues/40744
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