User`s guide

Configuring IP Routing
Managing IP routes and connections
MultiVoice Gateway for the MAX— User’s Guide Preliminary November 23, 1998 8-25
The elements of the syntax are as follows:
For example, to trace the route to the host Techpubs:
ascend% traceroute techpubs
traceroute to techpubs (10.65.212.19), 30 hops MultiVoice Gateway,
0 byte packets
1 techpubs.eng.ascend.com (10.65.212.19) 0 ms 0 ms 0 ms
Probes start with a TTL of one and increase by one until one of the following conditions
occurs:
1 The MultiVoice Gateway receives an ICMP port unreachable message.
The UDP port in the probe packets is set to an unlikely value, such as 33434, because the
target host is not intended to process the packets. A port unreachable message indicates
that the packets reached the target host and were rejected.
2 The TTL value reaches the maximum value.
By default, the maximum TTL is set to 30. You can specify a different TTL by using the
–m option; for example:
traceroute -m 60 techpubs
traceroute to techpubs (10.65.212.19), 60 hops MultiVoice Gateway, 0
byte packets
1 techpubs.eng.abc.com (10.65.212.19) 0 ms 0 ms 0 ms
Three probes are sent at each TTL setting. The second line of command output shows the
address of the router and round trip time of each probe. If the probe answers come from
different gateways, the address of each responding system is shown. If there is no response
Syntax element Description
-n Prints hop addresses numerically rather than symbolically and
numerically (this eliminates a name server address-to-name lookup
for each gateway found on the path).
-v Verbose output. Lists all received ICMP packets other than Time
Exceeded and ICMP Port Unreachable.
-m
max_ttl Set the maximum time-to-live (maximum number of hops) for
outgoing probe packets. The default is 30 hops.
-p
port Set the base UDP port number used in probes. Traceroute hopes that
nothing is listening on any of the UDP ports from the source to the
destination host (so an ICMP Port Unreachable message will be
returned to terminate the route tracing). If something is listening on a
port in the default range, this option can be used to pick an unused
port range. The default is 33434.
-q
nqueries Set the maximum number of queries for each hop. The default is 3.
-w
waittime Set the time to wait for a response to a query. The default is 3 seconds.
host The destination host by name or IP address.
datasize Set the size of the data field of the UDP probe datagram sent by
Traceroute. The default is 0. This results in a datagram size of 38 bytes
(a UDP packet carrying no data).