学步园

ping 返回结果解释：

 

!      Each exclamation point indicates receipt of a reply. 

.      Each period indicates the network server timed out while waiting for a reply. 

U      A destination unreachable error PDU was received. 

Q      Source quench (destination too busy). 

M      Could not fragment. 

?      Unknown packet type. 

&      Packet lifetime exceeded.

 

 

 

IP Traceroute返回结果解释： 

 

*        The probe timed out 

A        Administratively prohibited (example, access-list) 

Q        Source quench (destination too busy) 

I        User interrupted test

U        Port unreachable 

H        Host unreachable 

N        Network unreachable 

P        Protocol Unreachable 

T        Timeout 

?        Unknown packet type

转载：http://blog.chinaunix.net/uid-20530497-id-2048996.html