fedora mtu值的问题，求打救

[949911572]

# ping -f -l 1452 www.163.com
WARNING: probably, rcvbuf is not enough to hold preload.
PING 163.xdwscache.glb0.lxdns.com (112.90.179.64) 56(84) bytes of data.
^C
--- 163.xdwscache.glb0.lxdns.com ping statistics ---
22836 packets transmitted, 2245 received, 90% packet loss, time 4534ms
rtt min/avg/max/mdev = 25.130/277.058/335.576/48.320 ms, pipe 1453, ipg/ewma 0.198/320.176 ms


# ping -f -l 100 www.163.com
PING 163.xdwscache.glb0.lxdns.com (58.249.61.228) 56(84) bytes of data.
^C
--- 163.xdwscache.glb0.lxdns.com ping statistics ---
1271 packets transmitted, 1171 received, 7% packet loss, time 2339ms
rtt min/avg/max/mdev = 18.388/191.083/201.711/29.213 ms, pipe 100, ipg/ewma 1.842/198.380 ms

无论我用这个命令ping什么东西，即使是127.0.0.1都是不显示过程，没有一个个包的显示。而且都丢包，我设置越小，丢包率就越小，路由上的MTU值是1480。包在设为100的时候是丢包率7% .到底应该怎么办？