On Mon, 05 Sep 2022 21:07:34 +0000, tincantech via Openvpn-users
<openvpn-users@lists.sourceforge.net> wrote:

>On Monday, September 5th, 2022 at 21:02, Bo Berglund <bo.bergl...@gmail.com> 
>wrote:
>
>> So now I have a client which is set to use persist-tun (I have no idea what 
>> this
>> does) and the forum thread indicates that commenting it out solves the 
>> reconnect
>> issue.
>> 
>> QUESTION:
>> ---------
>> Is it possible to send a command from the server to the client via the ccd
>> system on connect to NOT use persist-tun?
>> 
>> The reason is that it is impossible for me to access the router and deal with
>> its config since it is VERY remote now (1700 km).
>> If I could send this to the client on connect then it could hopefully solve 
>> the
>> problem.
>> But how would that be formulated in the ccd file for the client?

>
>Hi Bo,
>
>your best bet is to get the remote office admin to email you the router log, 
>after setting --verb 4 in the config.
>
>Unless you prefer the _wild stab in the dark_ approach.

Well, the "remote office" is populated by *one* non-technical person, who can
only manage the power switching of the router...

My options are AFAICT:

1. Do nothing and let him power cycle whenever the connection drops, but
   tell him to bring the router along when he travels to Sweden the next time.

2. Find a way to push the blocking of persist-tun via a ccd command for this
   client only. But it might not be possible if the persisted tun is in
   operation already when the client reaches the server?

I have successfully changed this client's tunnel IP address to one that I could
block LAN access for via iptables. Thanks again for pointing out my IP range
miscalculation for this!
Now working.

PS:
His router is an older ASUS RT-AC51U and I do not know the openvpn version it
uses, but my current RT-AC86U routers in Sweden use this:

admin@RT-AC86U:/tmp/home/root# openvpn --version
OpenVPN 2.3.2 arm-buildroot-linux-gnueabi [SSL (OpenSSL)] [LZO] [EPOLL]
[eurephia] [MH] [IPv6] built on Sep 11 2018

which is also not the most recent one...
But the ASUS firmware is fully updated.


-- 
Bo Berglund
Developer in Sweden



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