3Com 3CRWX120695A, 3CRWX440095A manual Error messages for traceroute, WX4400# traceroute server1

traceroute 161

Examples — The following example traces the route to host server1:

WX4400# traceroute server1

traceroute to server1.example.com (192.168.22.7), 30 hops max, 38 byte packets 1 engineering-1.example.com (192.168.192.206) 2 ms 1 ms 1 ms

2 engineering-2.example.com (192.168.196.204) 2 ms 3 ms 2 ms 3 gateway_a.example.com (192.168.1.201) 6 ms 3 ms 3 ms

4 server1.example.com (192.168.22.7) 3 ms * 2 ms

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 36 instead of displaying the round-trip time or an asterisk (*).

Table 36 describes the traceroute error messages.

Table 36 Error messages for traceroute

Field	Description
!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.