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|Oracle Solaris Administration: IP Services Oracle Solaris 10 1/13 Information Library|
You can use the ping command to determine the status of a remote host. When you run ping, the ICMP protocol sends a datagram to the host that you specify, asking for a response. ICMP is the protocol responsible for error handling on a TCP/IP network. When you use ping, you can find out whether an IP connection exists for the specified remote host.
/usr/sbin/ping host [timeout]
In this syntax, host is the name of the remote host. The optional timeout argument indicates the time in seconds for the ping command to continue trying to reach the remote host. The default is 20 seconds. For additional syntax and options, refer to the ping(1M) man page.
$ ping hostname
If host hostname is accepting ICMP transmissions, this message is displayed:
hostname is alive
This message indicates that hostname responded to the ICMP request. However, if hostname is down or cannot receive the ICMP packets, you receive the following response from the ping command:
no answer from hostname
$ ping -s hostname
Example 8-13 ping Output for Detecting Packet Dropping
The ping -s hostname command continually sends packets to the specified host until you send an interrupt character or a time out occurs. The responses on your screen resemble the following:
& ping -s host1.domain8 PING host1.domain8 : 56 data bytes 64 bytes from host1.domain8.COM (172.16.83.64): icmp_seq=0. time=1.67 ms 64 bytes from host1.domain8.COM (172.16.83.64): icmp_seq=1. time=1.02 ms 64 bytes from host1.domain8.COM (172.16.83.64): icmp_seq=2. time=0.986 ms 64 bytes from host1.domain8.COM (172.16.83.64): icmp_seq=3. time=0.921 ms 64 bytes from host1.domain8.COM (172.16.83.64): icmp_seq=4. time=1.16 ms 64 bytes from host1.domain8.COM (172.16.83.64): icmp_seq=5. time=1.00 ms 64 bytes from host1.domain8.COM (172.16.83.64): icmp_seq=5. time=1.980 ms ^C ----host1.domain8 PING Statistics---- 7 packets transmitted, 7 packets received, 0% packet loss round-trip (ms) min/avg/max/stddev = 0.921/1.11/1.67/0.26
The packet-loss statistic indicates whether the host has dropped packets. If ping fails, check the status of the network that is reported by the ifconfig and netstat commands. Refer to Monitoring the Interface Configuration With the ifconfig Command and Monitoring Network Status With the netstat Command.