An enterprise network is as follows.

Note: In Huawei firewalls, the usage of the ping command is somewhat different, as follows:

1. Introduction to ping: It is mainly used to check the network connection and whether the host is reachable. Based on the ICMP protocol, after the source sends an ICMP echo request (ECHO-REQUEST) message to the destination, it determines whether the destination is reachable based on whether the destination end ICMP echo reply (ECHO-REPLY) packet is received. .

-a: Sets the source IP address for sending ECHO-REQUEST packets, which is usually used when testing VPN.

-c: Number of times the ECHO-REQUEST packet is sent. The default is 5.

-f: Sets the sent packet to be fragmented. If the MTU value is smaller than the packet size, the packet will be discarded.

-t: The timeout period for waiting for a response after the ECHO-REQUEST is sent. The default is 2s, that is, the response is not reachable within 2s.

-s: Set the message size (excluding IP and ICMP headers);