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

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

Quintin

On Thu, Jan 18, 2018 at 12:42 PM nusenu <nusenu-lists@xxxxxxxxxx> wrote:

<tor-admin@portaltodark.world> wrote:
> Resent under the correct alias.
>
> I'm having high amounts of failures on this VPS (PulseServers). I run a
> local unbound instance, and see an incredible amount of:
> Jan 17 19:27:33 torexit unbound: [559:0] notice: sendto failed: Operation
> not permitted
> Jan 17 19:27:33 torexit unbound: [559:0] notice: remote address is
> 198.97.190.53 port 53
> Jan 17 19:27:33 torexit unbound: [559:0] notice: sendto failed: Operation
> not permitted
> 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
> Jan 17 19:27:33 torexit unbound: [559:0] notice: remote address is
> 192.35.51.30 port 53
> Jan 17 19:27:33 torexit unbound: [559:0] notice: sendto failed: Operation
> not permitted
>
> To give proportion to "incredible amount",
> Jan 17 19:21:32 torexit rsyslogd: imjournal: 9897 messages lost due to
> rate-limiting
> Jan 17 19:22:02 torexit journal: Suppressed 1216 messages from
> /system.slice/unbound.service
> Jan 17 19:22:32 torexit journal: Suppressed 1209 messages from
> /system.slice/unbound.service
> Jan 17 19:23:02 torexit journal: Suppressed 1827 messages from
> /system.slice/unbound.service
> Jan 17 19:23:32 torexit journal: Suppressed 2333 messages from
> /system.slice/unbound.service
> Jan 17 19:24:02 torexit journal: Suppressed 3029 messages from
> /system.slice/unbound.service
> Jan 17 19:24:32 torexit journal: Suppressed 2822 messages from
> /system.slice/unbound.service
> Jan 17 19:25:02 torexit journal: Suppressed 2715 messages from
> /system.slice/unbound.service
> Jan 17 19:25:32 torexit journal: Suppressed 3166 messages from
> /system.slice/unbound.service
> Jan 17 19:26:02 torexit journal: Suppressed 4093 messages from
> /system.slice/unbound.service
> Jan 17 19:26:32 torexit journal: Suppressed 45878 messages from
> /system.slice/unbound.service
> Jan 17 19:27:02 torexit journal: Suppressed 30125 messages from
> /system.slice/unbound.service
> Jan 17 19:27:32 torexit journal: Suppressed 31764 messages from
> /system.slice/unbound.service
> Jan 17 19:28:02 torexit journal: Suppressed 31229 messages from
> /system.slice/unbound.service
>
> Could it be limits from the VPS provider on the amount of outbound udp/53
> connections?

To me this looks more like a local problem?
Are you doing any packet filtering on the host (outbound)?

Does DNS work on that host if you try manual queries?

From the IPs in your logs I assume your unbound is configured to query
recursively itself (no upstream forwarding) that is good, can you confirm that
and provide your unbound config + iptalbes -vnL?

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