Network configuration problem

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http://askubuntu.com – I am beginner with Ubuntu 12.04 and I have the following problem with my network configuration. I have 4 PC with following configuration: wireless router with IP: with Internet access PC1 eth0 IP: SM: GW: PC2 eth0 IP: SM: GW: wlan0 IP: SM: GW: PC3 wlan0 IP: SM: GW: PC4 wlan0 IP: SM: GW: PC2 has Wireless card connected with the wireless router and an Ethernet card connected with an cable to the PC1, with dif (HowTos)