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Troubleshooting Question

Random Timeout when pinging firewall

Adam Lane
Adam Lane asked
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Last Modified: 2020-10-09
One of my clients has been experiencing random internet drops or lag. Their switch, firewall, and cable modem are brand new, and even switched to a new ISP recently. After doing some troubleshooting and elimination, I found that pinging between servers and workstations is normal, but packets will drop randomly between 2-10 minutes when pinging from the LAN to the gateway/firewall. The switch is a Netgear GS348PP Unmanaged PoE switch. The firewall is a SonicWall TZ350 running SonicOS Enhanced 6.5.4.4-44n firmware and SonicROM 5.6.2.2. One thing that sticks out in the event log is about every 4 or 5 minutes, "IP address conflict detected..." Source: X0 (LAN interface), but that does not correlate with the timeouts. I'm positive there is nothing else on the network with the same IP as the gateway. I'm not exactly sure where to go from here. It should also be noted that my client uses a cloud VoIP service, and phone connectivity and call quality are not affected when these random timeouts happen.
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