Her some additional information:
root@vserver:/etc/openvpn/server# ip route get 192.168.63.1
192.168.63.1 via 192.168.99.4 dev tun0 src 192.168.99.1 uid 0
[root@ipfire ~]# ip route get 192.168.99.1
192.168.99.1 dev tun0 src 192.168.99.4 uid 0
ip route get 192.168.63.1
192.168.63.1 dev green0 src 192.168.63.254 uid 0
gerd@capricorn:~$ ip route get 192.168.99.1
192.168.99.1 via 192.168.63.254 dev enp3s0 src 192.168.63.1 uid 1000
on ipfire i can ping 192.168.99.1 and 192.168.63.1
but i cant ping 192.168.99.1 from 192.168.63.1 and vice versa…
So it seens ipfire has a problem… but this is the only machin where nothing changed during “upgrading” the net from net30 to subnet
Ciao Gerd