[tor-relays] Nameservers fail and come back at the same time?

[s7r]

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Hello,

This isn't new, and it happens with any DNS resolver (ISP resolver,
Google or OpenDNS, custom DNS resolver on localhost running unbound or
bind, etc.).

I have experienced it on all the exits I ever run, it's the most
common warning. There's a ticket for it opened by me:

https://trac.torproject.org/projects/tor/ticket/11600

When I opened the ticket, we thought it may be a libevent issue; that
makes the nameserver look down while it is not, but see comment 6 in
the linked ticket - that might be a cause also.

In the mean time until we resolve this just keep the exit running with
a localhost unbound or bind resolver and don't use Google or OpenDNS
resolvers. It's best that an exit relay runs its own resolver.

On 2/1/2016 5:46 AM, Tristan wrote:
> After sending tor a HUP, I now have errors from OpenDNS and Google
> DNS servers. I opened a support ticket with the provider to find
> out how to use their provided nameservers. Looks like I just need
> to keep fiddling. At any rate, I'm still getting plenty of traffic,
> and the servers come back almost instantly, so it shouldn't be
> making too much of an impact.
> 
> Thanks for the help!
> 
> On Jan 31, 2016 5:41 PM, "Tim Wilson-Brown - teor"
> <teor2345 at gmail.com <mailto:teor2345 at gmail.com>> wrote:
> 
> 
>> On 1 Feb 2016, at 10:38, Tristan <supersluether at gmail.com 
>> <mailto:supersluether at gmail.com>> wrote:
>> 
>> Well, my VPS nameservers are domain names, not IP addresses, so
>> I can't use them directly. In the meantime, I added Open DNS to 
>> resolv.conf, but I still get errors from Google DNS. Do I need
>> to reboot to apply changes to resolv.conf?
>> 
> You likely need to send a HUP to tor to get it to re-read your DNS 
> configuration.
> 
> Maybe Google DNS is not reliable from your location, so you could 
> put another name server first? Or perhaps investigate resolving
> your VPS DNS manually, then using their IP addresses as well?
> 
> Tim
> 
>> On Jan 31, 2016 3:27 PM, "Tim Wilson-Brown - teor" 
>> <teor2345 at gmail.com <mailto:teor2345 at gmail.com>> wrote:
>> 
>> 
>>> On 1 Feb 2016, at 08:19, SuperSluether <supersluether at gmail.com
>>> <mailto:supersluether at gmail.com>> wrote:
>>> 
>>> I'm not sure how many DNS servers are configured because I 
>>> never configured them. I just installed Tor and edited the 
>>> torrc file with my port, exit policy, and bandwidth options. 
>>> Where would I add/configure DNS servers?
>> 
>> Typically, by editing /etc/resolv.conf. But some platforms
>> automatically generate it using the files in
>> /etc/resolvconf/resolv.conf.d/
>> 
>> It should be fairly straightforward, if not, search the Internet
>> for a HOWTO for your platform.
>> 
>> Tim
>> 
>> Tim Wilson-Brown (teor)
>> 
>> teor2345 at gmail dot com PGP 968F094B
>> 
>> teor at blah dot im OTR CAD08081 9755866D 89E2A06F E3558B7F
>> B5A9D14F
>> 
>> 
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>> 
>> _______________________________________________ tor-relays
>> mailing list tor-relays at lists.torproject.org 
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> 
> Tim Wilson-Brown (teor)
> 
> teor2345 at gmail dot com PGP 968F094B
> 
> teor at blah dot im OTR CAD08081 9755866D 89E2A06F E3558B7F
> B5A9D14F
> 
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