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

[SuperSluether]

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?

On 01/31/2016 03:08 PM, Tim Wilson-Brown - teor wrote:
>
>> On 1 Feb 2016, at 06:33, SuperSluether <supersluether at gmail.com 
>> <mailto:supersluether at gmail.com>> wrote:
>>
>> My exit node's consensus weight just jumped from 20 to 1750 
>> overnight. When I checked to see how things were going, my log file 
>> is full of nameserver problems, happening every couple of minutes:
>>
>> Jan 31 14:12:40.000 [warn] eventdns: All nameservers have failed
>> Jan 31 14:12:40.000 [notice] eventdns: Nameserver 8.8.4.4:53 is back up
>> Jan 31 14:18:35.000 [warn] eventdns: All nameservers have failed
>> Jan 31 14:18:35.000 [notice] eventdns: Nameserver 8.8.4.4:53 is back up
>> Jan 31 14:20:53.000 [warn] eventdns: All nameservers have failed
>> Jan 31 14:20:53.000 [notice] eventdns: Nameserver 8.8.4.4:53 is back up
>> Jan 31 14:20:59.000 [warn] eventdns: All nameservers have failed
>> Jan 31 14:20:59.000 [notice] eventdns: Nameserver 8.8.4.4:53 is back up
>>
>> But the "All nameservers have failed" and "Nameserver xxx is back up" 
>> messages happen in pairs /at the exact same time./ What's going on 
>> here, and is there a way to fix this? My VPS has 2 nameservers listed 
>> for it, should I be using those?
>
> The times in tor logs are anonymised by rounding to the nearest 
> second. So these entries are close together, but not necessarily at 
> the same time.
>
> How many DNS servers do you have configured?
> (It looks like it's only one. That's quite a fragile configuration.)
> If it fails a request by chance, but the next request succeeds, this 
> is the pattern of messages you'll see.
>
> Try adding a local caching resolver as the first listed name server.
>
> You might want to add your VPS DNS servers, and Google's other server 
> to the end of the list, too.
> (A benefit of using local DNS servers is that fewer networks see your 
> DNS requests.
> A drawback is that your VPS company then sees your DNS requests and 
> your traffic, but they could do this anyway.)
>
> 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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