[tor-bugs] #1263 [Tor Relay]: ICMP and DNS problems under load

Tor Bug Tracker & Wiki torproject-admin at torproject.org
Fri Nov 12 02:02:56 UTC 2010


#1263: ICMP and DNS problems under load
------------------------------+---------------------------------------------
 Reporter:  grumpy3           |         Type:  defect   
   Status:  new               |     Priority:  minor    
Milestone:  Tor: unspecified  |    Component:  Tor Relay
  Version:  0.2.1.22          |   Resolution:  None     
 Keywords:                    |       Parent:           
------------------------------+---------------------------------------------
Changes (by nickm):

  * milestone:  => Tor: unspecified


Old description:

> OS: gentoo linux up to date
>
> File Edit Options Buffers Tools Help
> when Tor does not run, the OS and the network is running as
> expected. When Tor runs with 256kBps and 512kBps burst, after
> about 15minutes after the available bw to Tor is fully used, some
> network capabilities of the system are degraded:
>
> * ping -f 8.8.8.8 reports more than 70% of packet loss
> * traceroutes don't finish (stars for every nodes)
> * DNS requests (w/ dig) fail to query _any_ DNS server 9 times
>   over 10
>
> All that is fully functional when Tor is not running.
>
> Moreover, with that setup, Tor reports the following lines in the
> logs:
>
> 00:39:26 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
> 00:39:26 [WARN] eventdns: All nameservers have failed
> 00:33:25 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
> 00:33:25 [WARN] eventdns: All nameservers have failed
> 00:32:59 [NOTICE] eventdns: Nameserver 8.8.4.4 is back up
> 00:32:59 [WARN] eventdns: All nameservers have failed
> 00:29:54 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
> 00:29:54 [WARN] eventdns: All nameservers have failed
> 00:26:43 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
> 00:26:42 [WARN] eventdns: All nameservers have failed
>
> load of the system is near 0, there is no memory problems.
>
> If I set the available bw to Tor to 2MBps, Tor uses only about
> 400kBps. I have no logs like above, and the dig command can reach
> the servers 9 times over 10. The traceroute command also perform
> nearly as well as without Tor.
>
> I can't assess right now if the ISP has kind of traffic
> filtering. Checks about that are ongoing.
>

> [Automatically added by flyspray2trac: Operating System: Other Linux]

New description:

 OS: gentoo linux up to date

 File Edit Options Buffers Tools Help
 when Tor does not run, the OS and the network is running as
 expected. When Tor runs with 256kBps and 512kBps burst, after
 about 15minutes after the available bw to Tor is fully used, some
 network capabilities of the system are degraded:

 * ping -f 8.8.8.8 reports more than 70% of packet loss
 * traceroutes don't finish (stars for every nodes)
 * DNS requests (w/ dig) fail to query _any_ DNS server 9 times
   over 10

 All that is fully functional when Tor is not running.

 Moreover, with that setup, Tor reports the following lines in the
 logs:

 00:39:26 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
 00:39:26 [WARN] eventdns: All nameservers have failed
 00:33:25 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
 00:33:25 [WARN] eventdns: All nameservers have failed
 00:32:59 [NOTICE] eventdns: Nameserver 8.8.4.4 is back up
 00:32:59 [WARN] eventdns: All nameservers have failed
 00:29:54 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
 00:29:54 [WARN] eventdns: All nameservers have failed
 00:26:43 [NOTICE] eventdns: Nameserver 8.8.8.8 is back up
 00:26:42 [WARN] eventdns: All nameservers have failed

 load of the system is near 0, there is no memory problems.

 If I set the available bw to Tor to 2MBps, Tor uses only about
 400kBps. I have no logs like above, and the dig command can reach
 the servers 9 times over 10. The traceroute command also perform
 nearly as well as without Tor.

 I can't assess right now if the ISP has kind of traffic
 filtering. Checks about that are ongoing.


 [Automatically added by flyspray2trac: Operating System: Other Linux]

--

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1263#comment:6>
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