Ping Commands
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29 Terms
Ping command
A network diagnostic tool used to test connectivity between two devices using IP addresses.
Purpose of ping
To check if a device is reachable and responding on a network.
Basic ping syntax
ping [IP address] (e.g., ping 192.168.1.1)
What ping sends
Small data packets called ICMP echo requests.
What a reply means
The target device is reachable and responding.
Request timed out
The device did not respond within the time limit.
Destination host unreachable
Network or routing failure preventing access to the device.
0% packet loss
Perfect connection with all packets successfully received.
Packet loss
Percentage of sent packets that fail to reach or return from the target.
High packet loss meaning
Unstable or failing network connection.
100% packet loss
No communication with the target device.
Packet sent
Number of ping requests transmitted.
Packet received
Number of successful replies from the target device.
Ping checks what layer
Network layer (logical IP connectivity).
Ping does NOT test
Physical cable quality directly or signal strength directly.
TTL meaning
Time To Live, number of network hops a packet can take before expiring.
High TTL value meaning
Fewer network hops or closer device.
Low TTL value meaning
More routing hops away.
Reply from output meaning
Successful communication with the target IP.
Common use of ping in avionics
Testing Ethernet-based avionics systems and diagnostic connections.
Ping in maintenance
Used to verify connectivity between laptops and aircraft systems or LRUs.
First step in troubleshooting
Check connectivity using ping before deeper diagnostics.
If ping works
Device is powered and the network path is functioning.
If ping fails
Check power, IP address, cables, subnet, or device status.
Intermittent ping response
Possible loose connection or failing network component.
ICMP full name
Internet Control Message Protocol.
Ping target type
IP address only (not MAC address).
Why ping is useful
Quickly isolates whether a network connection is live or broken.