[Pdns-users] Additional UDP ports

[Brian Candler]

On 22/11/2020 20:21, Yves Goergen via Pdns-users wrote:
> I've noticed that the PDNS server listens on more than the configured 
> ports. There are several other UDP ports open:
>
>> ss -ulpn |egrep 'State|pdns'
>> State  Recv-Q Send-Q  Local Address:Port  Peer Address:Port Process
>> UNCONN 0      0       192.168.81.35:53         0.0.0.0:* 
>> users:(("pdns_server",pid=1585,fd=5))
>> UNCONN 0      0           127.0.0.1:53         0.0.0.0:* 
>> users:(("pdns_recursor",pid=1077,fd=4))
>> UNCONN 0      0             0.0.0.0:19990      0.0.0.0:* 
>> users:(("pdns_server",pid=1585,fd=18))
>> UNCONN 0      0                [::]:53            [::]:* 
>> users:(("pdns_server",pid=1585,fd=6))
>> UNCONN 0      0                   *:13618            *:* 
>> users:(("pdns_server",pid=1585,fd=19))
>
> Here it's port numbers 19990 and 13618. Other servers seem to have 
> other port numbers.
>
> What does that mean? Is it used for something? Can it be configured away? 

AFAIK, pdns_server doesn't *listen* on those additional ports, but it 
creates and binds UDP sockets for the purpose of *sending* outbound 
packets - specifically, notifies to secondaries.

Regards,

Brian.

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