[tor-relays] debugging unbound on 'torexit' failing DNS queries

teor teor2345 at gmail.com
Thu Jan 18 19:17:25 UTC 2018

> On 19 Jan 2018, at 06:06, Quintin <tor-admin at portaltodark.world> wrote:
> No outbound filters, this is my config:
> *filter
> -A INPUT -p icmp -j ACCEPT
> -A INPUT -i lo -j ACCEPT
> -A INPUT -p tcp -m comment --comment "SSH" -s x.x.x.x -m state --state NEW -m tcp --dport 22 -j ACCEPT
> -A INPUT -p tcp -m comment --comment "Tor" -m state --state NEW -m tcp --dport 80 -j ACCEPT
> -A INPUT -p tcp -m comment --comment "Tor" -m state --state NEW -m tcp --dport 443 -j ACCEPT
> -A INPUT -j REJECT --reject-with icmp-host-prohibited
> -A FORWARD -j REJECT --reject-with icmp-host-prohibited
> If I stop tor then "dig @ google.com" works 100%. It's seems like the pattern is that when tor traffic builds up so do DNS failures. And then my dig @ only succeeds about 0.1% of the time. At this stage large amounts these errors start appearing:
> > Jan 17 19:27:33 torexit unbound: [559:0] notice: remote address is port 53
> > Jan 17 19:27:33 torexit unbound: [559:0] notice: sendto failed: Operation not permitted

Try setting RelayBandwidthRate to 95% of your link capacity.
Then wait a few hours.

If you are still having issues:
* check if you have a lot of inbound connections from a small number of IPs,
* read recent threads for firewall rules to limit inbound connection load.

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