用来攻击可不好哦ping xxx.xxx.xxx.xxx -l 6550065500是包的最大值ping命令的详细参数，你自己看吧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] target_nameOptions:
-t
Ping the specified host until stopped.
To see statistics and continue - type Control-Br
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.
-i TTL
Time To Live.
-v TOS
Type Of Service.
-r count
Record route for count hops.
-s count
Timestamp for count hops.
-j host-list Loose source route along host-list.
-k host-list Strict source route along host-list.
-w timeout
Timeout in milliseconds to wait for each reply.
