Re: [Openvpn-users] OpenVPN tunnel stopped working (no traffic) after upgrade to OpenVPN 2.7 (Fedora 44)

Hi,

On 14/05/2026 21:53, Piotr Dobrogost wrote:
>> This (and also on the local LAN interface to see if they are actually
>> getting out).
> 
> [miner@hostx ~]$ sudo tcpdump -i enp5s0 icmp
> dropped privs to tcpdump
> tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
> listening on enp5s0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
> 21:35:04.694647 IP hostx > xyz.sfx.pl: ICMP hostx udp port 46099
> unreachable, length 141
> 21:35:05.718684 IP hostx > xyz.sfx.pl: ICMP hostx udp port 46099
> unreachable, length 141
> 21:35:06.742366 IP hostx > xyz.sfx.pl: ICMP hostx udp port 46099
> unreachable, length 141
> 21:35:07.766012 IP hostx > xyz.sfx.pl: ICMP hostx udp port 46099
> unreachable, length 141
> 21:35:08.790908 IP hostx > xyz.sfx.pl: ICMP hostx udp port 46099
> unreachable, length 141
> 

This looks interesting, but please don't filter for "icmp", because on 
the uplink interface you can't see what's inside the OpenVPN packets.
So here you are filtering for "outern ICMPs".

Please rather filter for "host xyz.sfx.pl" and do the test again.


Regards,



-- 
Antonio Quartulli