FPGA board with multiple Ethernet connections (Gigabit Ethernet)

Hi,
I am searching for an FPGA board having multiple gigabit ethernet
connectivity support on it. To be more precise, I need to have
multiple RJ45 connectors and associated logic (PHY) on the FPGA board
so that I can process multiple (maximum 24) ethernet streams on the
FPGA. Can anyone suggest any such board? or any add-on module which
can be hooked up on some particuar FPGA board providing 24 ethernet
connections !

Best Regards
Farhan