[asterisk-users] Asterisk 14.0.2 opens a high numbered UDP port

[George Joseph]

On Thu, Oct 13, 2016 at 12:35 PM, Brandon B. <bbinab at gmail.com> wrote:

> What part of Asterisk 14.0.2 opens the random, high numbered (33094
> currently) UDP port? This port is opened even without any channel drivers
> loaded.
>
> $ sudo netstat -ltunp | grep asterisk
> udp        0      0 0.0.0.0:51488 0.0.0.0:*
>  13830/asterisk
> udp        0      0 0.0.0.0:5060 0.0.0.0:*
>  13830/asterisk
> udp        0      0 :::42516 :::*
> 13830/asterisk
>
>
>
Those ports are used by the underlying pjproject DNS resolver.  The
resolver is always listening on those ports for DNS query responses.  1 for
IPV4 and 1 for IPV6.  Your firewall should only be allowing responses to
flow through to those ports that match outgoing requests.





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-- 
George Joseph
Digium, Inc. | Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
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