I apologize for what is probably bad form in replying to an older thread
that has sort of fallen off, but I've been trying to figure out why I
just can't seem to get any consensus weight on our middle relay
(ByTORAndTheSnowDog).
We moved in May to another city and have a different internet provider
now. We had gigabit symmetrical internet at the last place and I *get*
that a drop in bandwidth and consensus should be expected, but our
internet bandwidth here is not that bad. 300mbit down/20mbit up.
Consensus weight is mostly a function of your upstream bandwidth,
right? Do the bandwidth auth testers ever "get it wrong"? I'm not sure
where to look to see what kind of bandwidth is being measured from us.
It seems unlikely however that we are only able to push out the paltry
rates I see in our atlas entries.
These are the rate limiting-related settings I'm running in torrc:
RelayBandwidthRate 2300 KB
RelayBandwidthBurst 2500 KB
BandwidthRate 2300 KB
BandwidthBurst 2500 KB
Not using any MaxAdvertisedBandwidth settings anymore -- I commented
them out a week or so ago at last restart after reading that you
shouldn't set these if you are looking to get more traffic.
The most likely explanation is, we just don't have the upstream
bandwidth we think we do. But I consistently get speedtest.net upstream
tests above 20 megabits/sec to different speedtest sites around eastern
US "hubs" (atlanta, virginia, ie, places that have bandwidth). So I
don't understand.
Thanks
On 09/13/2016 09:38 PM, teor wrote:
On 14 Sep 2016, at 11:34, jensm1 <jen...@bbjh.de> wrote:
Addendum: Did a bit of research (or rather checked some random relays on Atlas).
It seems like it's not only my relay that experienced a significant drop at the
same time. I can't find anything obvious these relays have in common. new/old,
large/small, guard/exit/middle, different countries and ASes.
So it might be BWAuth related after all.
I don't think you need to worry about this in the short term - it is entirely
normal for a relay's consensus weight to fluctuate.
But here's my analysis, based on recent authority votes.
8 authorities vote on your relay
8 have the relay's observed bandwidth as 1112 (kilobytes per second)
4 measure your bandwidth, as:
377
394
1680
2820
https://collector.torproject.org/recent/relay-descriptors/votes/
The consensus has your weight as the low-median of these values: 394.
https://collector.torproject.org/recent/relay-descriptors/consensuses/2016-09-14-00-00-00-consensus
When your relay is measured again in another week, it might be that a figure
closer to ~1500 becomes the low-median. If so, your observed bandwidth might
end up being used as your consensus weight.
The long-term fix for bandwidth measurement this is for the Tor network to
geographically distribute more bandwidth authorities, or use a distributed
bandwidth measurement system (this is an unsolved problem for untrusted
distributed networks).
It is possible that connections between your relay and other relays are blocked
or slowed by some kind of firewall. This seems unlikely, because you're on the
default ports. Do you block any outgoing ports from your tor instance? Has your
provider imposed a bandwidth cap?
Tim
Am 14.09.2016 um 02:49 schrieb jensm1:
That's exactly what baffles me. I didn't make any changes to the relay
configuration since updating to 0.2.8.7. I've always had some fluctuations in
the Advertised Bandwidth as reported by Atlas, but I assume these are from the
BWAuth measurements?
The only thing on my end, that I could imagine, is that the VPS provider
changed something in his configuration. But since I don't see any interruption
of the servers uptime (neither in Tor, nor in Debian, nor in the VPS control
panel), I assume this couldn't be anything drastic like moving the VM to a
different host machine.
Am 14.09.2016 um 02:10 schrieb teor:
On 13 Sep 2016, at 23:30, jensm1 <jen...@bbjh.de>
wrote:
I last restarted the relay five days ago (update to 0.2.8.7). Can a restart
really cause the consensus weight to drop several days later? If it drops
within a few hours, I'd get that, but what would delay that response that much?
(Not complaining, just genuinely curious.)
I'm really not sure - any flag changes should have an impact within an hour.
Several days later is more likely to be bandwidth authority measurement - is
your relay up and capable of transmitting as much traffic as it was before it
was restarted?
Are its ports open to all other relays?
Can it open connections to other relays, regardless of their ports?
Did you make any other config changes at the same time?
Tim
Am 13.09.2016 um 10:37 schrieb teor:
On 13 Sep 2016, at 18:05, jensm1 <jen...@bbjh.de>
wrote:
Hi,
I just realised that my relay 'itwasntme' lost most of its consensus
weight yesterday morning. The relay is only three weeks old, but it was
finally picking up some traffic, which now is gone again.
What could be the cause for this? Is there a problem with my relay or
configuration?
It looks like you just recently gained some consensus weight, then temporarily
lost it after you restarted your relay.
We're working on improving the stability algorithm so these temporary downtimes
don't affect relays as much.
But in any case, wait a week or two, and it will be back.
(If not, please let us know.)
Tim
Thanks for your help!
https://atlas.torproject.org/#details/F46C312E279185364F46EA06C58F7925280911E2
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