This object represents the number of octets to be placed into the ARR Data portion of the request message, when using SNA protocols. For non-ARR protocols' RTT request/responses, this value represents the native payload size. REMEMBER: The ARR Header overhead is not included in this value. For echo probes the total packet size = (IP header(20) + ICMP header(8) + 8 (internal timestamps) + request size). For echo, pathEcho and pathJitter default request size is 28. For udp probe, default request size is 16 and for jitter probe it is 32. For dlsw probes default request size is 0. The minimum request size for echo, pathEcho and pathJitter is 28 bytes, for udp it is 4 and for jitter it is 16. For udp and jitter probes the maximum request size is 1500. For ethernetPing the default request size is 66. For ethernetJitter the default request size is 51.