hab die /etc/network/interfaces wie folgt abgeändert
	Code:
	# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto enp1s12
iface enp1s12 inet static
  address 192.168.2.0
  gateway 192.168.2.1
# This is an autoconfigured IPv6 interface
iface enp1s12 inet6 auto
# The primary network interface
auto enp1s7
iface enp1s7 inet static
 address 192.168.3.0
 gateway 192.168.3.1
# This is an autoconfigured IPv6 interface
iface enp1s7 inet6 auto
 ifconfig -a erzeugt folgende ausgabe
	Code:
	enp1s7: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.3.0  netmask 255.255.255.0  broadcast 192.168.3.255
        inet6 fe80::3e49:37ff:fe17:ea0c  prefixlen 64  scopeid 0x20<link>
        ether 3c:49:37:17:ea:0c  txqueuelen 1000  (Ethernet)
        RX packets 38358  bytes 2595218 (2.5 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 573092  bytes 859312843 (859.3 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
enp1s12: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.0  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 2003:e7:bd8:2e05:20b:dbff:fe41:3474  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::20b:dbff:fe41:3474  prefixlen 64  scopeid 0x20<link>
        ether 00:0b:db:41:34:74  txqueuelen 1000  (Ethernet)
        RX packets 4351  bytes 403742 (403.7 KB)
        RX errors 0  dropped 376  overruns 0  frame 0
        TX packets 364  bytes 50818 (50.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
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 1000  (Lokale Schleife)
        RX packets 5116  bytes 308152 (308.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5116  bytes 308152 (308.1 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 und es läuft. server ist aus beiden netzwerken erreichbar. Thx for help