how to ping & use specific network card

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http://unix.stackexchange.com – i have 3 network cards , 1 Lan (wired) , 1 wireless network card & 1 is wireless usb how do i ping from specific network card ? & how do i use specific network card for specific application example i want to ping google from wlan1 example for specific application i want to use firefox or transmission from wan1 Lan ip > Working Properly pin -I wlan1 google.com route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface UG 0 0 0 eth0 (HowTos)