[tor-talk] concurrent HS connections limit and guard traffic rate-limit

[s7r]

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Was wondering if there are any theoretical limits for the maximum
possible concurrent connections to a Hidden Service via a single Tor
instance  - asking from the Hidden Service server point of view.

Excluded are CPU and bandwidth factors - are there any other factors
which can act as a bottleneck here?

One would be, the way I see it, the guard server. Since a Guard is
selected randomly and kept for longer period of time, let's say a
Hidden Service selects a Guard with low bandwidth resources (lowest
allowed by directory authorities in order to make it eligible for
receiving the guard flag). Now, this Guard also handles traffic for
other clients too, simultaneously.

Since the Guard's bandwidth resources are low, the Hidden Service
server can be a ten-gigabit one, it won't matter, since all the Hidden
Service traffic will go through the Guard, and that will be the
bottleneck.

A Guard by default, does it make any rate-limiting for Tor traffic per
client? Let's pretend my guard server gets selected to be the Guard
for a high profile Hidden Service which handles a lot of traffic. This
single client will consume all my bandwidth - will the default Tor
settings do anything to rate-limit it in any way? Will I still handle
other clients too, simultaneously?

Apologies in advance if I said something terrible stupid.
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