Hello all I find the tcp is not fit for the high realtime communication in the LAN. For the small packets(e.g.64Bytes), some packets will be delayed for 30ms. It's too long. Are there any high realtime and stable protocol(opensource & commerical)? In the LAN communication, the delay time MUST be less than 10ms for the small packets. B.R. Lu - : 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