Quick Diagnosis

Procedure

1. Log on to the Smart Access Gateway console.
2. Navigate to the Device Settings page using one of the following methods:
   • Click the ID of the target Smart Access Gateway instance. On the instance details page, click Device Settings.
   • In the Operation column of the target Smart Access Gateway instance, click > Device Settings.
3. On the Device Settings page, click the Quick Diagnostic tab.
4. Click Diagnose. Smart Access Gateway checks the following items:

   Type	Item	Description
   SAG Configurations	LAN port configuration check	Checks the status and IP address configuration of the device's LAN ports.
   	WAN port configuration check	Checks the status of the device's WAN ports, the 4G connection, and the WAN port IP address configuration.
   	Management port configuration check	Checks the status and IP address configuration of the device's management port.
   	Leased line port configuration check	Checks the status and IP address configuration of the device's leased line port.
   	CIDR block conflict check	Checks for overlapping CIDR blocks among the device's configured ports.
   	Neighbor device status check	Checks if OSPF or BGP is enabled and, if so, verifies the neighbor status.
   	High availability configuration check	Checks whether high availability (HA) is enabled and, if so, verifies its operational status.
   Workload Quality	Control plane TCP connection check	Checks the connection status between the device and the control center.
   	Online status check	Checks whether the Smart Access Gateway device is connected to Alibaba Cloud.
   	Device expiration check	Checks if the device's service has expired.
   	CCN configuration check	Checks if the device is attached to a Cloud Connect Network (CCN) instance and verifies the CCN configurations.
   	Cloud and on-premises CIDR block conflict check	Checks for CIDR block conflicts between the device's ports and your cloud network.
   	VPN connection quality check	Measures the quality of the VPN connection to Alibaba Cloud, including average latency and packet loss.
   Network Quality	Internet connection quality check	Measures the quality of the device's Internet connection (via a WAN port or 4G), including average latency and packet loss.
   	DNS resolution check	Checks whether the device can correctly resolve domain names by using DNS.

5. After the diagnosis is complete, review the results and recommended actions on the page.
   The results are categorized by severity level:

   Severity	Description
   Critical	A critical issue was found that impacts network traffic. This requires immediate action.
   Warning	An issue was found that might affect your network. Consider addressing this issue.
   Normal	The item passed the check. No action is required.