Home
Help
Search
Login
Register
OPNsense Forum
»
Archive
»
20.7 Legacy Series
»
Why do I have NTP traffic to random IP's?
« previous
next »
Print
Pages: [
1
]
Author
Topic: Why do I have NTP traffic to random IP's? (Read 2745 times)
opnrules
Newbie
Posts: 4
Karma: 0
Why do I have NTP traffic to random IP's?
«
on:
July 30, 2020, 11:27:06 pm »
From time to time NTP connections to IPs like 185.83.169.27 are made.
Why and how can I block them? I don't see an option for this particular protocol in the rules.
I have my VPN providers DNS IP configured.
«
Last Edit: July 30, 2020, 11:35:15 pm by opnrules
»
Logged
aesth
Newbie
Posts: 17
Karma: 1
Re: Why do I have NTP traffic to random IP's?
«
Reply #1 on:
July 31, 2020, 12:31:38 am »
NTP is port 123
Logged
lrosenman
Full Member
Posts: 197
Karma: 8
Re: Why do I have NTP traffic to random IP's?
«
Reply #2 on:
July 31, 2020, 01:35:24 am »
The system defaults to OPNsense pool NTP servers. You really DO want NTP to do it's thing so that your system time is accurate and not drifting.
Time is CRITICAL for certificate and SSL validation.
attached is what my system is currently using.
«
Last Edit: July 31, 2020, 01:37:26 am by lrosenman
»
Logged
opnrules
Newbie
Posts: 4
Karma: 0
Re: Why do I have NTP traffic to random IP's?
«
Reply #3 on:
July 31, 2020, 01:40:36 am »
Thanks for the explanation. Can I not simply have time synced via my specified DNS servers?
Logged
lrosenman
Full Member
Posts: 197
Karma: 8
Re: Why do I have NTP traffic to random IP's?
«
Reply #4 on:
July 31, 2020, 01:43:43 am »
DNS is *NOT* NTP.
NTP servers synchronize to GPS and other stratum 1 servers.
DNS is purely for Domain Name (Human Readable)-> IP address (and other info). It has NOTHING to do with time.
Please read up on NTP.
http://www.ntp.org/ntpfaq/NTP-s-def.htm
Logged
siga75
Full Member
Posts: 187
Karma: 11
Re: Why do I have NTP traffic to random IP's?
«
Reply #5 on:
July 31, 2020, 07:41:18 am »
You can specify custom NTP servers on services -> network time -> general
but this is not really needed, default is a good setting, especially since you don't seems to be an expert on this topic
Logged
https://www.signorini.ch
Protectli Pfsense Mi7500L6 Intel 7Th Gen Core I7 7500U 16Gb Ddr4 Ram
512Gb Msata Ssd
6 X Intel Gigabit Ethernet
senseless
Newbie
Posts: 4
Karma: 0
Re: Why do I have NTP traffic to random IP's?
«
Reply #6 on:
September 13, 2020, 12:21:36 am »
I am wondering the same. Why does OPNsense try to contact the following IPs with UDP/123 (i.e. NTP) 185.17.70.106, 212.25.1.1, etc. (see picture attached)? These are not the default OPNsense NTP Servers (which by the way at the moment are configured as "do not use").
Where are the NTP servers show in the picture configured?
Logged
Print
Pages: [
1
]
« previous
next »
OPNsense Forum
»
Archive
»
20.7 Legacy Series
»
Why do I have NTP traffic to random IP's?