Specifications

Niagara Release 2.3
Revised: May 22, 2002 Niagara Networking & Connectivity Guide
Chapter 2 Configuration and Troubleshooting Tools
Connectivity Troubleshooting Utilities
2–22
• In the first two examples, a host was pinged using its IP address, then its name.
• In the third example a switch was used (-a) to show the name while pinging by
IP address.
• The host responded in under 10 milliseconds in each of the above instances,
showing good connectivity.
• The fourth examples shows the response you see when an IP address is not
responding.
Note The ICMP protocol can be blocked (filtered) by routers and firewalls. That means if
you ping a host that is located on the other side of a blocking device, you will see the
“Request timed out” message rather than a “Reply” message, even if the host is
available.
tracert The tracert (traceroute) utility shows the path taken by an IP packet between the
source and the destination address. It is also an ICMP-based protocol, so it is subject
to the filtering restrictions mentioned in the previous note.
For example, if the host Saturn failed to reply with the ping command (or replied
slowly), the administrator could use
tracert to trace the path of the communication
between the two hosts to determine where the communication fault lay.
Typical use for the tracert command for a Windows-based host is:
tracert <ipaddress>
or
tracert <hostname>
where
<ipaddress> is the IP address of the host you want to check connectivity to.
<hostname> is the name of the host you want to check connectivity to.
Note On most other operating systems, the command is typed “traceroute”, but the
Windows command is typed “tracert”.
Figure 2-13 shows an example of a traceroute to the host www.bbs.co.uk.