I'm using a PF_PACKET, SOCK_RAW socket to send ethernet packets. I write the dst MAC address, src MAC address, and proto into a buffer, then append my payload. I send the whole thing to the socket, using a length that includes the ethernet header and my payload. But, I think I've been using MTU wrong the whole time. Assuming a 'normal' MTU of 1500 on an ethernet NIC. Does that mean I have 14 bytes of ethernet payload, 1500 bytes of payload, and 4 bytes of ethernet CRC (I don't specify the CRC, I assume the driver appends that?), or does it mean I have 14 bytes of header, 1486 bytes of payload and a CRC? Am I correct in assuming that the CRC is taken care of for me? Can I see the CRC in user-space? Thanks, Ben -- Ben Greear (greearb@candelatech.com) http://www.candelatech.com Author of ScryMUD: scry.wanfear.com 4444 (Released under GPL) http://scry.wanfear.com http://scry.wanfear.com/~greear - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.rutgers.edu
