Petrarca:
I read a few times at different places that there is a maximum of two Tor instances that can be run over one public IP address. My questions:
- Is this statement true?
Yes (two tor _relay_ instances per public IPv4). You can run as many non-relay instances (i.e. tor clients or onion services) on a public IP as you wish.
- Is there an easy workaround maybe?
No.
Just out of curiosity: what is the background for this limitation (if it is true)?
Make Sybil attacks harder.