Using The J-Web Traceroute Tool - Juniper J2300 User Manual

J-series™ Services Router User Guide
Field
number packets received
percentage packet loss
round-trip min/avg/max/stddev =
min-time / avg-time / max-time / std-dev
ms
If the Services Router does not receive ping responses from the destination host
(the output shows a packet loss of 100 percent), one of the following might apply:
For more information about ICMP, see RFC 792, Internet Control Message Protocol.

Using the J-Web Traceroute Tool

You can use the traceroute diagnostic tool to display a list of routers between
the Services Router and a specified destination host. The output is useful for
diagnosing a point of failure in the path from the Services Router to the destination
host, and addressing network traffic latency and throughput problems.
The Services Router generates the list of routers by sending a series of ICMP
traceroute packets in which the time-to-live (TTL) value in the messages sent to each
successive router is incremented by 1. (The TTL value of the first traceroute packet
is set to 1.) In this manner, each router along the path to the destination host replies
with a Time Exceeded packet from which the source IP address can be obtained.
Alternatively, you can use the CLI
(See "Using the traceroute Command" on page 228.)
To use the traceroute tool:
222
Using J-Web Diagnostic Tools
Description
number —Number of ping responses received from host.
percentage —Number of ping responses divided by the number of ping requests,
specified as a percentage.
min-time —Minimum round-trip time (see time= time field in this table).
avg-time —Average round-trip time.
max-time —Maximum round-trip time.
std-dev —Standard deviation of the round-trip times.
The host is not operational.
There are network connectivity problems between the Services Router and
the host.
The host might be configured to ignore ICMP echo requests.
The host might be configured with a firewall filter that blocks ICMP echo
requests or ICMP echo responses.
The size of the ICMP echo request packet exceeds the MTU of a host along
the path.
The value you selected in the Time-to-Live box was less than the number of
hops in the path to the host, in which case the host might reply with an
ICMP error message.
command to generate the list.
traceroute