Torstatus: What does stable server mean?

Moritz Bartl moritz at
Sun Dec 19 11:52:25 UTC 2010


"Stable" -- A router is 'Stable' if it is active, and either its 
Weighted MTBF is at least the median for known active routers or its 
Weighted MTBF corresponds to at least 7 days. Routers are never called 
Stable if they are running a version of Tor known to drop circuits 
stupidly.  ( through are stupid this way.)

"Guard" -- A router is a possible 'Guard' if its Weighted Fractional
Uptime is at least the median for "familiar" active routers, and if
its bandwidth is at least median or at least 250KB/s.

For more detail see the specs at the URL.
Hope this helps,


Am 19.12.2010 12:25, schrieb Klaus Layer:
> Hi,
> since several days I am running a tor relay. The torstatus page at i.e.
> shows for some of the listed servers the
> attributes "stable server" and "guard". What does that mean? When does a tor
> relay becomes a stable server or a guard?
> Thanks,
> Klaus

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