found some questions/answers depending on older versions of debian. I'm using a newer one (3.18.11+) and I try to get dhcpcd with static IP addresses running.
etc network interface
auto lo
iface lo inet loopback
auto eth0 iface eth0 inet manual
allow-hotplug wlan0
auto wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
dhcpcd.conf
interface eth0
static ip_address=192.168.1.111/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1 8.8.8.8
interface wlan0
static ip_address=192.168.1.112/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1 8.8.8.8
hostname .... default content
Result of this configuration with eth0 connected to the router
- ip address is 192.168.1.111/24 (dont understand the /24)
- can ping 192.168.1.111 from my pc
- no internet connection, it seams something wrong with name resolution
- I can open the router login mask from Raspberry with http://192.168.1.1