Alert Caused by Carrier Link Failure
Problem description
Problem phenomenon and analysis
(2) View the commonalities and details of scatter points
It was found that they are all on the same Host, and Host is 219.X.X.47 (Beijing Telecom)
(3) View the error Probe packet capture. From the analysis of the packet capture, after the DNS server parsed out Host IP, the client tried to establish a TCP connection with the server, but the server never responded, resulting in an unsuccessful connection establishment.
Problem recurrence
Summarize
2. Unable to parse Error are all on the same Host
3. Error was not found when Probe reappeared.
1.
(1) If you don’t receive it, it means the operator lost it on the road.
(2) If received, it means there is no problem with the operator.
2.
(1) After receiving Request, if it is sent, it means that the operator lost it on the road.
(2) After receiving Request, if it is not sent, it means there is a problem with the corresponding server.