hello, I added my own 8 byte header using skb_push function in front of transport header in ip_build_and_send_pkt function ip_output.c file before skb_push for IP header. same thing i did in ip_rcv function in ip_input.c to strip off headers. but when i boot that image and ping the effects in ping packet will not reflect and after some time i got kernel BUG at slab 1130! Is am i missimg some other modifications.i am new to this kernel development. If any one having other suggestion please reply me. regards, Parag. __________________________________ Do you Yahoo!? Yahoo! Photos: High-quality 4x6 digital prints for 25¢ http://photos.yahoo.com/ph/print_splash - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html