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Executing Commands
For upcoming labs and courses, you will require many different commands. Probably the most basic
of these is ‘ping ’. Try running the following command to ping the Google OpenDNS Server (8.8.8.8)
located at 10.203.1.5
What is ‘ping’?
The
command you just ran, ‘ping’, is a command designed to test the connectivity between two
networked computers. Simply put, the ping command sends ICMP
packets from your computer
to the target computer (in this case, 10.203.1.5), which then returns the packets to your computer.
Your computer measures the journey time of each individual packet, deriving metrics from this,
thus giving you useful information about the network connection and possibly the machine you’re
‘pinging’.
Example
tundra:~ msai135$ ping -c 5 -n 10.203.1.5
PING 10.203.1.5 (10.203.1.5): 56
data bytes
64 bytes from 10.203.1.5: icmp_seq=0 ttl=63 time=0.536 ms
64 bytes from 10.203.1.5: icmp_seq=1 ttl=63 time=0.562 ms
64 bytes from 10.203.1.5: icmp_seq=2 ttl=63 time=0.645 ms
64 bytes from 10.203.1.5: icmp_seq=3 ttl=63 time=0.668 ms
64 bytes from 10.203.1.5: icmp_seq=4 ttl=63 time=0.640 ms
--- 10.203.1.5 ping statistics ---
5 packets transmitted, 5
packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.536/0.610/0.668/0.052 ms
tundra:~ msai135$
ping -c 5 -n 8.8.8.8
Ping the IP Address 10.203.1.5
for a count of 5 (-c 5), outputting
numerical values only (-n)
