On 2018-12-10 at 18:16, Thomas Haller wrote:
> you need to have the routes configured properly, which depends on your
> environment.

Maybe should I ask on debian mailing-lists (not that much active, not
sure I can get more relevant help than here)?

> Well, NM should get it right automatically. If it doesn't,
> then you should look at the routes to understand what's wrong.
>
> What gives:
>
>   ip route

Currently I’m not at the needed local network, so doing it at home, with
normally configured network, I get:

galex-713@portable:~/doc/comp/src/pharo/opensmalltalk-vm$ ip route
default dev tun0 proto static scope link metric 50 
default via 192.168.1.254 dev enp0s25 proto static metric 100 
89.234.186.64/27 dev tun0 proto kernel scope link src 89.234.186.82 metric 50 
169.254.0.0/16 dev enp0s25 scope link metric 1000 
192.168.1.0/24 dev enp0s25 proto kernel scope link src 192.168.1.38 metric 100 

When enabling “VPN config > IPv4 Settings > Routes… > Use this
connection only for resources on its network” checkbox, I get this:

galex-713@portable:~/doc/comp/src/pharo/opensmalltalk-vm$ ip route
default via 192.168.1.254 dev enp0s25 proto static metric 100 
89.234.186.64/27 dev tun0 proto kernel scope link src 89.234.186.82 metric 50 
89.234.186.190 via 192.168.1.254 dev enp0s25 proto static metric 100 
169.254.0.0/16 dev enp0s25 scope link metric 1000 
192.168.1.0/24 dev enp0s25 proto kernel scope link src 192.168.1.38 metric 100 
192.168.1.254 dev enp0s25 proto static scope link metric 100 

I’m under Debian GNU/Linux stable, x86 (32bits).

Btw ifconfig:
galex-713@portable:~/doc/comp/src/pharo/opensmalltalk-vm$ /sbin/ifconfig
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.38  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 2a01:e0a:54:cb90:dd93:58f3:5591:dc39  prefixlen 64  scopeid 
0x0<global>
        inet6 fe80::6a50:6fa8:1bc9:b6d1  prefixlen 64  scopeid 0x20<link>
        ether 00:1f:16:14:45:a9  txqueuelen 1000  (Ethernet)
        RX packets 425383  bytes 300655547 (286.7 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 94334  bytes 15010937 (14.3 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 20  memory 0xf2700000-f2720000  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1  (Boucle locale)
        RX packets 1544  bytes 185223 (180.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1544  bytes 185223 (180.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
        inet 89.234.186.82  netmask 255.255.255.224  destination 89.234.186.82
        inet6 fe80::918:d4aa:a0ae:2b1d  prefixlen 64  scopeid 0x20<link>
        inet6 2a00:5884:8305::1  prefixlen 112  scopeid 0x0<global>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  
(UNSPEC)
        RX packets 12  bytes 1476 (1.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 12  bytes 808 (808.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

both interfaces are only present, but only tun0 works in the first case,
and only enps25 works in the second.
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