are doing ping with do not fragment bit set and size 1500 byte? If so consider that when you send a packet bigger then max admitted MTU over the path, the packet must be fragmented; if you are using the "do not fragment" bit the packet will be discarded and an ICMP Can't Fragment Error packet is generated (type 3 (destination unreachable), code 4 (fragmentation needed but don't-fragment bit set).
If you specify size 1500 the real size of the packet is more then 1500 due to ICMP header
Assuming you mean packet size (not MTU which is a characteristic of network segment) I suppose some appliance in the network infrastructure will drop fragmented packet but it's strange. Try debug ip icmp to see which is the device that discard your packets.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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