TCP/IPv6 Configuration and Management Manual (G06.24+)

Manage the NonStop TCP/IPv6 Subsystem
HP NonStop TCP/IPv6 Configuration and Management Manual—524523-008
6-30
Displaying a Datagram’s Route to a Network Host by
Using the Tracer Utility
Examples:
This command directs the output of a trace to be sent to a remote system named
\IDEV to a disk file named $fiti.trace.traceout on the local system.
>TACL TRACER/OUT $fiti.trace.traceout/IDEV
This command directs the output of a trace to be sent to a remote system named
\IDEV to a disk file named $wpo.trace.traceout on the system named \igate.
>TACL TRACER/OUT \igate.$wpo.trace.traceout/IDEV
[ -d ]
sets the SO_DEBUG option on the socket being used.
[ -m max-ttl ]
specifies the maximum time-to-live value (or number of hops) used in out-going
probe packets. If you do not specify this option, the Tracer Utility uses the default
value of 30 hops.
[ -n ]
specifies that the address of each gateway be printed numerically rather than both
symbolically and numerically. Therefore, only the IP address, rather than the
address and gateway name, appears in the output. Specifying -n avoids having
the Tracer Utility do a time-consuming address-to-name lookup. HP recommends
use of this option.
[ -p port-num ]
specifies the base UDP port number used in probes. If you do not specify this
option, the Tracer utility uses the default value 33434 for port-num.
The UDP port number, whether it is the default number or a number you specify
through this option, should not be an actual port range on the remote host to which
the probe is destined. The remote host should not process the probe packet.
Instead, the remote host should send back a ICMP_UNREACH_PORT message to
conclude route tracing. The Tracer Utility informs you of this occurrence by printing
an exclamation point either on your screen or in the disk file you specified.
Specifying the -p option is useful when the default value (33434) does specify an
actual port range on the destination host. In such cases, the -p option lets you
specify an unused port range.
[ -q nqueries ]
specifies the number of probes, or queries, for each TTL. If you do not specify this
option, the Tracer Utility uses the default value 3 for nqueries.