Is it normal for the service node to receive access from a large number of internal IPs?

Yes it is, and the internal IP address accessed will change when the service instance is migrated, and the principle is as follows:

In Packet Forwarding Mode, CLB uses IP within the public service network segment to perform health checks on backend service nodes;

In Request Proxy Mode, CLB uses an internal network proxy IP for health checks and request forwarding; in an intranet mode, it uses the IP in the subnet where CLB is located as the proxy IP; In extranet mode, IP within the public service network segment is used as the proxy IP (and will be unified to use the IP in the subnet as the proxy IP). It should be noted that the proxy IP address is not fixed, when the CLB resource instance is migrated, in order to ensure the normal operation of the service, the proxy IP address used will change.

View the public service network segment in various regions.