Re: The speed of my relay are decreasing and my rely now is out of the Tor statistics

[Scott Bennett <bennett@xxxxxxxxxx>]

     On Mon, 15 Feb 2010 18:27:51 +0100 Gitano <ran6oony7r9deku5@xxxxxxxxxxxxxx>
wrote:
>Scott Bennett wrote:
>
>>> dynamic IP that changes roughly weekly, and it saw traffic fairly
>>> consistently throughout the week with a slight dip for the 1-2 hours after
>>> the IP changed.
>>>
>>      Have you tried it since the switch to consensus documents?  As I noted
>> in my most recent posting to OR-TALK, a newly initialized relay does not
>> appear in the next consensus document issued, but rather in the one that
>> follows it.  That right there accounts for up to two hours' delay in clients
>> finding out about the new relay.  Now that new consensus documents are
>> usually not fetched by clients every hour anymore, but rather on a seemingly
>> random interval ranging from ~30 min. to ~2 hrs. 30 min., a client might
>> very well not know about a new relay for over four hours.
>>      Changing the IP address causes reinitialization, including reachability
>> and data rate capacity testing.  Given the right timing of the IP address
>> change, the authorities' own reachability testing of relays in the directory
>> might fall at a time when the address being tested had changed, but before
>> the relay in question had discovered that its address had changed,
>> reinitialized itself, and published its new descriptor, causing the
>> authorities to decide that the relay was no longer reachable and to drop the
>> relay from the next consensus.  That, in turn, would mean that clients would
>> not know that a new descriptor were available and thus would not download it
>> from a directory server.  It would not be surprising to me at all to find
>> cases where some fraction of the client population did not know about a
>> relay becoming operational at a new IP address for well over four hours.
>> Given that the most recent consensus document on my system at this moment
>> claims that TorDwarf's capacity is only "24", that relay will only be chosen
>> once in a while for a circuit and therefore will probably show very little
>> traffic for the first two or three hours after reinitialization at a new IP
>> address.
>
>Maybe there is another 'race condition' with dynamic DNS-Addresses. In
>the last few months my Tor-Bridge worked perfect without any address
>information in the config file. No problems with IP changes (which
>occurred every night!).
>
>For a normal node with DirPort enabled (like TorDwarf) I must enter a
>public address in the config file:
>###
>Feb 14 15:17:15.383 [info] resolve_my_address(): Address 'picolo'
>resolves to private IP address '10.0.1.2'. Tor servers that use the
>default DirServers must have public IP addresses.
>###
>
>So I set up "Address bitbox.dynalias.net".
>
>Last IP change: 2010-02-15 03:17:06
>
>Tor log:
>###
>Feb 15 03:18:02.728 [notice] Your IP address seems to have changed to
>87.122.140.203. Updating.
>Feb 15 03:18:02.774 [info] consider_testing_reachability(): Testing
>reachability of my ORPort: 87.122.140.203:9001.
>Feb 15 03:19:03.613 [info] consider_testing_reachability(): Testing
>reachability of my ORPort: 87.122.140.203:9001.
>Feb 15 03:20:04.738 [info] consider_testing_reachability(): Testing
>reachability of my ORPort: 87.122.140.203:9001.
>###
>
>What happens if 'bitbox.dynalias.net' is not updated before (or within)
>this testing period of 2 minutes?
>
     Remember that the way tor detects that the IP address "seems to have
changed" is by asking a name server for the A RR for bitbox.dynalias.net. and
noticing that the address returned in the A RR is not the same as the last
time tor checked on it.  So your question is meaningless because the DNS
update *has to have already occurred* for tor to notice the change.
     When I've seen this happen on my system, typically dhclient would pick
up the new address from the ISP's DHCP server, then sometime within the next
10 min. inadyn would check the interface configuration (or whatever inadyn
does to check the current address), notice the new IP address, and submit
the update to the server at dyndns.org, then sometime within the next 20
minutes or so, tor would check for the A RR, notice the change, and
reinitialize itself.  It's a lengthy process, mostly spent waiting for timers
to go off.


                                  Scott Bennett, Comm. ASMELG, CFIAG
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