3com WXR100 3CRWXR10095A 사용자 설명서

The first row of the display indicates the target host, the maximum 
number of hops, and the packet size. Each numbered row displays 
information about one hop. The rows are displayed in the order in which 
the hops occur, beginning with the hop closest to the WX switch.

The row for a hop lists the total time in milliseconds for each ICMP packet 
to reach the router or host, plus the time for the ICMP Time Exceeded 
message to return to the host.

An exclamation point (!) following any of these values indicates that the 
Port Unreachable message returned by the destination has a maximum 
hop count of 0 or 1. This can occur if the destination uses the maximum 
hop count value from the arriving packet as the maximum hop count in 
its ICMP reply. The reply does not arrive at the source until the destination 
receives a traceroute packet with a maximum hop count equal to the 
number of hops between the source and destination.

An asterisk (*) indicates that the timeout period expired before MSS 
received a Time Exceeded message for the packet.

If Traceroute receives an ICMP error message other than a Time Exceeded 
or Port Unreachable message, MSS displays one of the error codes 
described in Table 40 instead of displaying the round-trip time or an 
asterisk (*).

Table 40 describes the traceroute error messages.

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Table 40   Error messages for traceroute

!N

No route to host. The network is unreachable.

!H

No route to host. The host is unreachable.

!P

Connection refused. The protocol is unreachable.

!F

Fragmentation needed but Do Not Fragment (DNF) bit was set.

!S

Source route failed.

!A

Communication administratively prohibited.

?

Unknown error occurred.