NE40 directly connects PC. Ping NE40 at PC. Packet with less than 1472 bytes can be pinged, but packet with 1473 bytes cannot be pinged.
1. At NE40 check through debug ip icmp command and it is found that there are icmp echo and echo reply packet on the device. It indicates that the device receives ping packet of PC and responds. NE40 is not problematic.
2. Check PC configuration and it is found that PC operates firewall. Close firewall and packets can be pinged whether it is large or small.