[tor-relays] Re: Shutting down my ~40 guards

[TinCan via tor-relays <tor-relays@xxxxxxxxxxxxxxxxxxxx>]

Hi Marco,

Multiple things can cause that warning, an attack is one of them. Hard to tell from the warning message alone, though.

C-Tor is mostly single-threaded. Some circuit work does get delegated to helper threads, but most of the work happens on the main thread which is the bottleneck.


On Tuesday, October 20th, 2026 at 6:38 PM, Marco Moock via tor-relays <tor-relays@xxxxxxxxxxxxxxxxxxxx> wrote:

> Am 13.10.26 um 08:17 schrieb Marco Moock via tor-relays:
> > Am 13.10.26 um 00:53 schrieb forest via tor-relays:
> >> That was only possible in the v2 days, but v3 onion services are blinded
> >> which means it's not possible to find out the .onion address even if you
> >> are their HSDir. There's very little an attacker can do in the position
> >> of HSDir besides selective censorship (if they already know the .onion,
> >> they can match it to the descriptor and censor it).
> >>
> >> CCing Tobias Höller who I know is working on HSDir research and might
> >> have some insight into this whole situation.
> >
> > Are relays known which have HSDir and do such censorship attacks?
> >
> > Is there a good way to detect such attacks?
> 
> Now I got:
> [warn] Your computer is too slow to handle this many circuit creation
> requests! Please consider using the MaxAdvertisedBandwidth config option
> or choosing a more restricted exit policy
> 
> Is that maybe part of an attack?
> 
> The machine is an Intel Atom, but normally it was able to handle all the
> traffic. I also saw that Tor creates load on one core, not on 2.
> 
> Is Tor able to spawn 2 processes to handle the traffic?
> 
> --
> Gruß
> Marco
> Muell und Spam bitte an abfalleimer2002@xxxxxxxxxxxxxxxxxxxxxx
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