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Only the Raspberry Pi 3 can boot from network without special software on an inserted SD Card (you need to use U-Boot or a sepcial bootcode.bin on older models).

The instructions for the Pi 3 are here. Since you have a Pi2 , an alternative approach is to use a rootfs over NFS , as demonstrated by PiNet.

BerryBoot (Linux only) supports booting via iSCSI or from Samba/Windows Shares.

Because the nature of the Pis booting process , you still cannot skip the official second-stage start.elf bootloader (which now gets delivered over network).

Only the Raspberry Pi 3 can boot from network without special software on an inserted SD Card (you need to use U-Boot or a sepcial bootcode.bin on older models).

The instructions for the Pi 3 are here. Since you have a Pi2 , an alternative approach is to use a rootfs over NFS , as demonstrated by PiNet.

BerryBoot (Linux only) supports booting via iSCSI or from Samba/Windows Shares.

Because the nature of the Pis booting process , you still cannot skip the official second-stage start.elf bootloader (which now gets delivered over network).

The Raspberry Pi can not boot from network without special software on an inserted SD Card (you need to use U-Boot).

An alternative approach is to use a rootfs over NFS , as demonstrated by PiNet.

BerryBoot (Linux only) supports booting via iSCSI or from Samba/Windows Shares.

Because the nature of the Pis booting process , you still cannot skip the official second-stage start.elf bootloader though.

Only the Raspberry Pi 3 can boot from network without special software on an inserted SD Card (you need to use U-Boot or a sepcial bootcode.bin on older models).

The instructions for the Pi 3 are here. Since you have a Pi2 , an alternative approach is to use a rootfs over NFS , as demonstrated by PiNet.

BerryBoot (Linux only) supports booting via iSCSI or from Samba/Windows Shares.

Because the nature of the Pis booting process , you still cannot skip the official second-stage start.elf bootloader (which now gets delivered over network).

The Raspberry Pi can not boot from network without special software on an inserted SD Card (you need to use U-Boot).

An alternative approach is to use a rootfs over NFS , as demonstrated by PiNet.

BerryBoot (Linux only) supports booting via iSCSI or from Samba/Windows Shares.

Because the nature of the Pis booting process , you still cannot skip the official second-stage start.elf bootloader though.

The Raspberry Pi can not boot from network without special software on an inserted SD Card (you need to use U-Boot).

An alternative approach is to use a rootfs over NFS , as demonstrated by PiNet.

BerryBoot (Linux only) supports booting via iSCSI or from Samba/Windows Shares.

Because the nature of the Pis booting process , you still cannot skip the official second-stage start.elf bootloader though.