[tor-relays] 8 relays pers IP address are allowed from now (end of June 2023) on

[Georg Koppen]

Hi!

You might recall that Tor has been restricting the possible amount of 
Tor relays per IP address to 2, mainly for Sybil prevention reasons.[1] 
We bumped that limit to 4 earlier this year[2] to make better use of 
available resources and considered back then bumping that limit further 
to 8 relays per IP address.

I've good news for everyone looking forward to raising that limit 
further: after an investigation into the effects of allowing 4 relays 
per IP address[3] we think it is overall beneficial for the network and 
our users to raise it further to 8.

This change (by having set `AuthDirMaxServersPerAddr 8` on a majority of 
them) is in effect since a couple of hours and you can run more than 4 
relays per IP address now.

This is not meant to be a permanent change, though, but only a stopgap 
solution to work around missing multithreading support in Tor until 
relays in Arti will be available and deployed (which is still some years 
away from now).

For more details, information and discussion see: tor#40744.[4]

Thanks to everyone who helped making this change happen,
Georg

[1] 
https://gitlab.torproject.org/tpo/core/torspec/-/blob/main/proposals/109-no-sharing-ips.txt
[2] 
https://lists.torproject.org/pipermail/tor-relays/2023-February/020999.html
[3] https://gitlab.torproject.org/tpo/network-health/analysis/-/issues/51
[4] https://gitlab.torproject.org/tpo/core/tor/-/issues/40744
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