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Bug #14216

open

ntopng causes OpenVPN server errors 'error - IP packet with unknown IP version=15 seen' when OpenVPN server interface is selected

Added by Damir Altus about 2 years ago. Updated over 1 year ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
OpenVPN
Target version:
-
Start date:
Due date:
% Done:

0%

Estimated time:
Plus Target Version:
Release Notes:
Default
Affected Version:
Affected Architecture:

Description

If the OpenVPN server interface is selected in the ntopng 'General Options' - 'Interfaces', it causes thousands of OpenVPN server error logs at random intervals.

The OpenVPN server logs say - 'error - IP packet with unknown IP version=15 seen'.

No clients need to connect to the server to cause the errors to start at random.
It is not a problem with server-client compression, even though that can cause same error messages (as mentioned, no client needs to connect for errors to start).
Clean reinstall does not solve the problem.

After deselecting the OpenVPN interfaces in ntopng 'General Options' - 'Interfaces', no errors occur.

I can reproduce the problem by selecting the OpenVPN server interfaces in ntopng settings.

More details and troubleshooting can be found at the forum thread I opened in 2021
https://forum.netgate.com/topic/166112/error-ip-packet-with-unknown-ip-version-15-seen

The problem was fixed couple of days ago
https://forum.netgate.com/topic/166112/error-ip-packet-with-unknown-ip-version-15-seen/10?_=1680269984466

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 #1

Updated by Danilo Zrenjanin about 2 years ago

I couldn't reproduce this issue on the 23.01 pfSense Plus release.

ntopng    net    0.8.13_10

Can you please advise what the pfSense version you're running is?

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 #2

Updated by Damir Altus about 2 years ago

Fresh install 2.6.0-RELEASE (amd64) with current packages.
ntopng net 0.8.13_10

There are other installed packages also - apcupsd, arping, arpwatch, bandwidthd, Cron, darkstat, frr, iperf, lldpd, mailreport, mtr-nox11, nmap, openvpn-client-export, pfBlockerNG-devel, RRD_Summary, Service_Watchdog, Status_Traffic_Totals, WireGuard.

The error persisted trough multiple reinstalls on different hardware, until I deselected the OpenVPN interfaces.

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 #3

Updated by aleksei prokofiev almost 2 years ago

I can not reproduce it. Tested on 2.7.0 

ntopng    net    0.8.13_10

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 #4

Updated by Lev Prokofev over 1 year ago

I'm not able to reproduce on

23.09-DEVELOPMENT (amd64)
built on 20230920-1314
FreeBSD 14.0-CURRENT

ntopng    net    0.8.13_10
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