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interfaces: dhclient-script regression in 19.1 #3197

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@tbandixen

Just want to be sure the dev are aware of "our" issue.

After 10-20 minutes of uptime all incoming connections are beeing dropped!
So, OpenVPN tunnels are dropped too. It was fine on 18.7.10.

In the General-system log I can see this every 20 minutes:

Feb 5 13:00:55	opnsense: /usr/local/etc/rc.newwanip: Dynamic DNS: (Success) No change in IP address
Feb 5 13:00:55	opnsense: /usr/local/etc/rc.newwanip: Dynamic DNS: updating cache file /var/cache/dyndns.org_0.cache: ***
Feb 5 13:00:50	opnsense: /usr/local/etc/rc.newwanip: Interface '' is disabled or empty, nothing to do.
Feb 5 13:00:50	opnsense: /usr/local/etc/rc.newwanip: IP renewal is starting on 'ovpns2'

Feb 5 13:00:49	kernel: ovpns2: link state changed to UP
Feb 5 13:00:44	kernel: ovpns2: link state changed to DOWN
Feb 5 13:00:44	opnsense: /usr/local/etc/rc.newwanip: Resyncing OpenVPN instances for interface WAN.

Feb 5 13:00:40	opnsense: /usr/local/etc/rc.newwanip: ROUTING: skipping IPv6 default route
Feb 5 13:00:40	opnsense: /usr/local/etc/rc.newwanip: ROUTING: keeping current default gateway '***'
Feb 5 13:00:40	opnsense: /usr/local/etc/rc.newwanip: ROUTING: setting IPv4 default route to ***
Feb 5 13:00:40	opnsense: /usr/local/etc/rc.newwanip: ROUTING: IPv4 default gateway set to wan
Feb 5 13:00:40	opnsense: /usr/local/etc/rc.newwanip: ROUTING: IPv6 default gateway set to wan
Feb 5 13:00:40	opnsense: /usr/local/etc/rc.newwanip: ROUTING: entering configure using 'wan'
Feb 5 13:00:39	opnsense: /usr/local/etc/rc.newwanip: On (IP address: ***) (interface: WAN[wan]) (real interface: re1_vlan10).
Feb 5 13:00:39	opnsense: /usr/local/etc/rc.newwanip: IP renewal is starting on 're1_vlan10'

after every execution of rc.newwanip (even manually) all connection are dropped.

I watch TV over the internet and every 20 minutes the stream hangs, so I have to rewind to build up the stream again.

Here is the forum post:
https://forum.opnsense.org/index.php?topic=11456.0

Is there any solution? What could it be?
According to github, the last changes to rc.newwanip where 5 month ago (https://github.com/opnsense/core/commits/master/src/etc/rc.newwanip).
I think it has something to do with the switch to HardenedBSD, but I am absolutly not a unix guy...

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