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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