NetScaler SD-WAN Path Continuously Flipping Between GOOD/BAD/DEAD on WAN Links

Something to observe here is whether the GOOD/BAD/DEAD is occurring while the link is idle, or while the link is under load traffic. The following information covers all cases, but this is the "most common root cause" for each scenario: Idle - speed/duplex mismatch, ARP issue, IPS/IDS device and ...