Das Netzwerk ist einfach ...
Der Pi hängt mit Wlan und Kabel am Router und soll über AP0 eine eigenes Netzwerk aufbauen DNS incl. DHCP
root@raspberrypi:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether dc:a6:32:18:e9:69 brd ff:ff:ff:ff:ff:ff
inet 192.168.0.44/24 brd 192.168.0.255 scope global dynamic eth0
valid_lft 1911sec preferred_lft 1911sec
inet6 2a02:2455:ae6:4c00:dea6:32ff:fe18:e969/64 scope global dynamic mngtmpaddr noprefixroute
valid_lft 1119364sec preferred_lft 514564sec
inet6 fe80::dea6:32ff:fe18:e969/64 scope link
valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether dc:a6:32:18:e9:6a brd ff:ff:ff:ff:ff:ff
inet 192.168.0.42/24 brd 192.168.0.255 scope global dynamic wlan0
valid_lft 1925sec preferred_lft 1925sec
inet6 fe80::dea6:32ff:fe18:e96a/64 scope link
valid_lft forever preferred_lft forever
4: ap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether dc:a6:32:18:e9:6a brd ff:ff:ff:ff:ff:ff
inet 192.168.4.1/24 brd 192.168.4.255 scope global ap0
valid_lft forever preferred_lft forever
inet 192.168.4.10/28 scope global ap0
valid_lft forever preferred_lft forever
inet6 fe80::dea6:32ff:fe18:e96a/64 scope link
valid_lft forever preferred_lft forever