Ping troubleshooting helps identify whether a host can exchange ICMP echo traffic with another IP address. A failed ping is evidence to investigate, but it does not automatically mean the destination or entire network is offline.
1. Confirm the Test
Record the source device, destination, timestamp, exact message, and whether you are testing a hostname or IP address. Test an IP address first to separate connectivity from DNS.
2. Check the Local Interface
- Verify power, cable, Wi-Fi association, and interface state.
- Review error and drop counters.
- Confirm the adapter is not disabled.
3. Verify IP Configuration
Check the IP address, prefix or subnet mask, default gateway, and DNS servers. The two systems do not need the same IP address; each address must be unique. Hosts communicating directly on the same LAN must normally be in the correct shared subnet.
4. Test in Order
- Ping the local loopback address.
- Ping the local interface address.
- Ping another host on the same subnet.
- Ping the default gateway.
- Ping a remote IP address.
- Test the hostname and application.
5. Check ARP, VLANs and Routing
Inspect ARP or neighbor discovery, access VLANs, trunks, routing tables, next hops, and the return route. One-way routing can cause failed replies even when requests leave correctly.
6. Review Security Controls
Do not disable the firewall as a general troubleshooting step. Check whether host firewalls, network ACLs, or security devices intentionally block or rate-limit ICMP.
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