[tor-relays] max TCP interruption before Tor circuit teardown?

Dan Staples danstaples at disman.tl
Sun Nov 3 15:27:25 UTC 2013

This morning I got my first Tor traffic flood since upgrading to 2.4.x.
Logs didn't say anything about not being able to handle the amount of
circuit creation requests, but it showed a 200x increase in active TAP
circuits (~400k/hour) and the traffic pattern is the same: Advertising
100kb bandwidth, but slammed with ~2Mb traffic.

When I saw it, I checked my relay's flags, and it has the stable flag,
and has been tagged stable for at least 3 days. It's been up for 7 days.

I would love to contribute data to help correlate w/ your findings
Gordon. Any metrics or logs that would be particularly helpful? I
currently use NTop to measure traffic, but it's not very granular.

I also currently don't use any iptables rules to throttle, but am happy
to experiment with that if you want me to try out any particular


On 11/01/2013 05:30 PM, Gordon Morehouse wrote:
> huh, well, near as I can tell, I didn't get Stable for any time represented yesterday (2013-10-31) for the node VastCatbox.
> So maybe that theory is incorrect.  In that case I don't know what would trigger the SYN flood behavior other than Roger's idea about becoming an introducer for a popular HS, but... eh... seems like a stretch, a node offering 2.5Mbps that isn't flagged Stable?
> -Gordon
> On Fri, 1 Nov 2013 13:10:17 +0100, David Serrano <tor at dserrano5.es> wrote:
>> On 2013-10-31 10:04:02 (-0700), Gordon Morehouse wrote:
>>> I can't
>>> verify it, but my suspicion is this is happening when I get my Stable
>>> flag (I have no idea if I'd gotten it back this morning or not) or
>>> shortly thereafter.
>> You can use https://metrics.torproject.org/relay-search.html and enter
>> your IP address to figure that out.
>> -- 
>>  David Serrano
>>  GnuPG id: 280A01F9
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