命令格式：
ping ip地址 -l 字节数
注：上面的命令中 l 是字母l,不是数字1
网速等于≈(发送的字节数/返回的时间[毫秒])K字节
以上计算的结果速为字节(byte)，不是我们通常说的位(bps)
如：
C:/Documents and Settings/Administrator>ping 202.101.224.68 -l 1000
Pinging 202.101.224.68 with 1000 bytes of data:
Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251Reply from 202.101.224.68: bytes=1000 time=38ms TTL=251
Ping statistics for 202.101.224.68: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds: Minimum = 38ms, Maximum = 38ms, Average = 38ms
根据上述发送及返回的信息可以简单得出到地址202.101.224.68的网速为：
网速等于≈(发送的字节数/返回的时间[毫秒])K字节 ≈1000/38K字节 ≈26.32K字节
附：ping命令帮助说明
C:/Documents and Settings/Administrator>ping /?
Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS] [-r count] [-s count] [[-j host-list] | [-k host-list]] [-w timeout] [-R] [-S srcaddr] [-4] [-6] target_name
Options: -t Ping the specified host until stopped. To see statistics and continue - type Control-Break; To stop - type Control-C. -a Resolve addresses to hostnames. -n count Number of echo requests to send. -l size Send buffer size. -f Set Don't Fragment flag in packet (IPv4-only). -i TTL Time To Live. -v TOS Type Of Service (IPv4-only). -r count Record route for count hops (IPv4-only). -s count Timestamp for count hops (IPv4-only). -j host-list Loose source route along host-list (IPv4-only). -k host-list Strict source route along host-list (IPv4-only). -w timeout Timeout in milliseconds to wait for each reply. -R Trace round-trip path (IPv6-only). -S srcaddr Source address to use (IPv6-only). -4 Force using IPv4. -6 Force using IPv6.
C:/Documents and Settings/Administrator>