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NTP idle ports and ethernet interfaces


 
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# 1  
NTP idle ports and ethernet interfaces

I did a netstat -an and saw that ntp was listening on 4 UDP ports for each interface. Is this insecure because they are UDP ports and I don't see them in a listen state, is that because they are just a client.

Thank you.

*.ntp Idle
111.111.111.111.123 Idle
222.222.222.222.123 Idle
localhost.ntp Idle
# 2  
They are not insecure because it is UDP. UDP does not have a LISTEN state. That is TCP only. If your concerned about NTP security(and you should be) then look at the "restrict" option in ntp.conf for a client or server. See the documentation for details.
# 3  
Thank you.
 

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