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110 Chapter 2
Programming Fundamentals
Using the LAN to Control the Analyzer
Check that the hostname and IP address are correctly entered in the
node names database.
If you are using a UNIX environment, ping each node along the
route between your workstation and the analyzer, starting with the
your workstation. Ping each gateway, then attempt a ping of the
remote file server.
If the analyzer still does not respond to ping, then you should
suspect a hardware problem with the analyzer. To check the
analyzer performance, refer to "Verify the Analyzer Performance" in
this chapter.
Intermittent Response
If you received 1 to 8 packets back, there is probably a problem with
the network. Because the number of packets received depends on
your network traffic and integrity, the number might be different for
your network.
Use a LAN analyzer or LAN management software to monitor
activity and determine where bottlenecks or other problems are
occurring. The analyzer will still function, but communications over
the LAN will be slower.
On a single-client/single-server network, the most likely cause of
intermittent response to an echo request is a hardware problem with
the LAN module installed in the PC, the cable, or the analyzer. To
check the analyzer, refer to "Verify the Analyzer Performance" later
in this chapter.
The Standard UNIX PING Command
Synopsis ping [-r] [-v] [-o]
host [packetsize] [count]
Description The ping command sends an echo request packet to the host
once per second. Each echo response packet that is returned is listed on the
screen, along with the round-trip time of the echo request and echo response.
Options and Parameters -r Bypasses the routing tables, and sends the
request directly to the host.
-v Reports all packets that are received, including the response
packets.
-o Requests information about the network paths taken by the
requests and responses.
host The host name or IP address.
packetsize The size of each packet (8 bytes - 4096 bytes).
count The number of packets to send before ending ping (1-(2
31
-1)).
If count is not specified, ping sends packets until
interrupted.