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FAQ-What 'P' in NE40 tracert Results Means

Publication Date:  2012-07-27 Views:  283 Downloads:  0
Issue Description
The destination IP address can be pinged. The !P mark appears when tracert operation is performed.
Output display of normal tracert:
PING 56 data bytes, press CTRL_C to break
Reply from bytes=56 Sequence=1 ttl=254 time = 15 ms
Reply from bytes=56 Sequence=2 ttl=254 time = 20 ms
Reply from bytes=56 Sequence=3 ttl=254 time = 15 ms
Reply from bytes=56 Sequence=4 ttl=254 time = 21 ms
Reply from bytes=56 Sequence=5 ttl=254 time = 15 ms

--- ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 15/17/21 ms
。Output display with "!P":
traceroute to 30 hops max,40 bytes packet
1 29 ms 29 ms 30 ms
2 20 ms !P 79 ms !P 20 ms !P 
Alarm Information
Handling Process
IP indicates that a destination unreachable ICMP error message is returned for the UDP packets sent through tracert .Tracert identifies the destination unreachable ICMP messages of different types and outputs corresponding information. 
Root Cause