[tor-bugs] #8215 [Tor]: Simple Relay: random unknown UDP port in listen mode

[Tor Bug Tracker & Wiki]

#8215: Simple Relay: random unknown UDP port in listen mode
--------------------------+-------------------------------------------------
    Reporter:  elgo       |       Owner:                  
        Type:  defect     |      Status:  closed          
    Priority:  normal     |   Milestone:  Tor: unspecified
   Component:  Tor        |     Version:                  
  Resolution:  not a bug  |    Keywords:  tor-relay       
      Parent:             |      Points:                  
Actualpoints:             |  
--------------------------+-------------------------------------------------
Changes (by nickm):

  * keywords:  => tor-relay
  * status:  new => closed
  * resolution:  => not a bug
  * milestone:  => Tor: unspecified


Comment:

 >No one can explain this listening UDP socket?

 rransom could explain it! ;)  And he did:
 >That looks like a DNS client port. (Tor relays test their DNS-resolution
 configuration, even though they shouldn't be willing to perform DNS
 queries for clients.)

 Seriously, it probably *is* a DNS client port.  Servers use it so that
 they can make DNS requests if they decide to.

 The missing factor to understand is that a DNS client port is not the same
 as a DNSPort.  One of them (the one you have, the one rransom is talking
 about) is for *making* DNS requests -- the other (configured by DNSPort)
 is for *accepting* DNS requests and relaying them onto the Tor network.

 If this is still unclear, please feel free to ask more questions, here or
 on on help at rt.torproject.org

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8215#comment:4>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online