bind strange udp ports

[Mark Andrews]

> Hi, 
> 
> I'm running bind 9.4.2 and I've noticed that when bind starts, it binds
> in two different sequential udp ports.(udp, udp6). For example:
> 
> 
> udp        0      0 0.0.0.0:32827           0.0.0.0:*
> 20546/named         
> udp6       0      0 :::32828                :::*
> 20546/named 
> 
> 
> Does anyone know what is the purpose of these two ports and how I can
> disable them?

See the FAQ

Q: Why is named listening on UDP port other than 53?

A: Named uses a system selected port to make queries of other nameservers.
   This behaviour can be overridden by using query-source to lock down the
   port and/or address. See also notify-source and transfer-source.

> 
> thanks
> 
> 
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org