Hello I want to create something that recieves the input packets ( Tcp/IP) and then filter them . I don't know which board or fpga family is more usefull. please guide me. Thanks.
Try https://www.google.ch/#q=fpga+board+tcp%2Fip A similar question was discussed at Beitrag "TCP/IP Stack auf FPGA Boards" Maybe Google translator gives you a sufficiently readable English version.
The information you gave us are not sufficient to give a useful response (i.e. requirements, your background/knowledge, ...) . I would suggest you take a FPGA dev kit where an IP stack is already available as demonstration. This is the starting point for your application. For example this http://www.microsemi.com/products/fpga-soc/design-resources/dev-kits/smartfusion2/smartfusion2-development-kit#overview has magnetics and optical Ethernet interfaces, an FPGA with integrated microcontroller and a software stack for IP, for example in this demo design: http://www.microsemi.com/document-portal/doc_download/132605-dg0472-running-webserver-and-tftp-server-on-smartfusion2-devices-using-lwip-and-freertos-libero-soc-v11-5-demo-guide