[tor-relays] Guard flag flapping

Green Dream greendream848 at gmail.com
Sat Aug 8 04:49:16 UTC 2015

Thank you for the thoughtful replies. To clear up a few points:

- This is a dedicated bare-metal server -- not a VPS, VM or container. I
have physical access to the server, router and ONT.

- I would call it a dedicated gigabit link. This is probably up for debate.
The provider's overall capacity is very likely not [number of customers] x
[1 Gb/s] but I've never witnessed signs of throttling or over-subscription.
If I plug a laptop directly into the router, I get a 800 - 900 Mb/s
bidirectional speed test every time (via dslreports.com/speedtest).

If I fire up the Tor Browser Bundle and use the 'EntryNodes' config line to
force traffic through my own relays, performance is fine. It's not great
mind you, but it's no worse than going through randomly selected guards. In
fact, depending on the other middle and exit relays, I'd say my relays work
quite well as entries.

I've learned from this thread that the Guard flag flapping is a direct
result of the low measured bandwidth. I still have no idea why the measured
bandwidth is so (terribly, comically) low. The fact that it's so wrong is
somewhat telling. Actual performance on the network is like 1000 times
better than what the measured bandwidth says! Something feels very broken

Is it possible for an operator of one of the BWauth nodes to look into
this? What happens if you set my relays as 'EntryNodes' and run real-world

I will try the other optimizations mentioned here as well, at a slow pace,
so I can understand any changes that may occur.
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