If the MTU is smaller than the size of the ping packet, packet loss will occur, in which case, you need to change the size of the ping packet to a value smaller than the MTU or change the ping operation. In this case, check whether the MTU of the outbound interface along the path is smaller than the size of the ping packet. If this command is run, it indicates that packet fragmentation is not supported. Check whether the ping operation is properly performed.Ĭheck whether the ping -f command is run.The parameter -vpn-instance vpn-name specifies the VPN instance to which the pinged destination address belongs. To ping a private network address from a PE, you need to run the ping -vpn-instance vpn-name destination-address command. Check the device and link status and clear the fault. If the ping operation can succeed only after -t is increased to a very long value, there is a possibility that a fault occurs on the device or link. To solve this problem, increase the value of -t. If the preceding information is displayed, it indicates that the ping failure occurs because the configured link transmission delay is shorter than the actual delay.
PING 10.1.1.1: 56 data bytes, press CTRL_C to breakĮrror: Sequence number = 1 is less than the correct = 2! If ping packet loss occurs because the configured link transmission delay is shorter than the actual delay, the following information is displayed: ping -v -t 1 10.1.1.1 Therefore, you can specify proper values for -t and -v to check whether the ping failure is caused by a long link transmission delay. The ping operation succeeds if a Response packet is received within a specified period, and the ping operation fails if no Response packet is received within the specified period. The parameter -v is used to display unexpected Response packets by default, such packets are not displayed. By default, the timeout period is 2000 ms. In this command, the parameter -t is used to set the timeout period for waiting for a Response packet from the destination end.