Score:0

NTP Traffic, but NTP not installed

mw flag

I have recently started with OPNSense and have limited outgoing traffic to HTTP/s, SSH ports. When analyzing my blocked traffic i found sporadic outgoing NTP-Requests from my local Linux machine.

I am not very familiar with NTP.
I am now wondering a few things.

  1. The source port is always different. Is this normal behavior/ caused by the firewall block?

    192.168.1.101:52936
    192.168.1.101:54299
    192.168.1.101:45992
    ...
    
  2. I actually don't have NTP installed. So i don't quite understand why i even have NTP traffic?

in flag
Yes, source port is a random high-port, destination port is 123. Are you sure you dont have a NTP-client? Most distros have one preinstalled...
Coalbl4ck avatar
mw flag
Oh okay good to know. I have checked for both the ntp and openntpd package (Arch). So unless it is some really strange NTP-client that came as a dependency, i shouldn't really.
Score:0
cn flag

Many Linux distros ship with an NTP client enabled by default. Check your system for chrony or systemd-timesyncd. The latter is the default on most systemd-enabled distributions.

Coalbl4ck avatar
mw flag
Right, i actually have a systemd-timesyncd service running. Thanks for the answer! :)
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