Fujitsu SPARC Enterprise M4000, Service Manual

Page: 58 / 310

2-34 SPARC Enterprise M4000/M5000 Servers Service Manual • December 2010
2.7.5 Using the
ping
Command
The
ping
command sends ICMP ECHO_REQUEST packets to network hosts.
Depending on how the
ping
command is configured, the output displayed can
identify troublesome network links or nodes. The destination host is specified in the
variable
hostname .
2.7.5.1 Options
TABLE 2-16
describes options for the
ping
command and how those options can help
troubleshooting.
The following example shows output for the
ping -s
command.
TABLE 2-16
Options for
ping
Option Description How It Can Help
hostname The probe packet is sent to
hostname and returned.
Verifies that a host is active on the network.
-g hostname Forces the probe packet to route
through a specified gateway. By identifying different routes to the target host, those
individual routes can be tested for quality.
-i
interface Designates which interface to
send and receive the probe
packet through. Enables a simple check of secondary network interfaces.
-n
Replaces host names with IP
addresses. Used when an address is more beneficial than a host name.
-s
Pings continuously in one-second
intervals. Ctrl-C aborts. Upon
abort, statistics are displayed. Helps identify intermittent or long-duration network events.
By piping
ping output to a file, activity overnight can later
be viewed at once.
-svR
Displays the route the probe
packet followed in one-second
intervals. Indicates probe packet route and number of hops.
Comparing multiple routes can identify bottlenecks.
# ping -s san-ff2-17-a
PING san-ff2-17-a: 56 data bytes
64 bytes from san-ff2-17-a (10.1.67.31): icmp_seq=0. time=0.427 ms
64 bytes from san-ff2-17-a (10.1.67.31): icmp_seq=1. time=0.194 ms
^C
----san-ff2-17-a PING Statistics----
2 packets transmitted, 2 packets received, 0% packet loss
round-trip (ms) min/avg/max/stddev = 0.172/0.256/0.427/0.102
#