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

[teor <teor2345@xxxxxxxxx>]

On 19 Jan 2018, at 06:06, Quintin <tor-admin@portaltodark.world> wrote:

No outbound filters, this is my config:

*filter

:INPUT ACCEPT [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

-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

COMMIT

If I stop tor then "dig @127.0.0.1 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 @127.0.0.1 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 192.42.93.30 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.

T

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