Hi all, I'm sure we all know that you can use ping and do-not-fragment to test the L3 MTU of a path. But can you do anything to test the L2 MTU? We have the L2 MTU on some interfaces set to 1592. L3 MTU is still set to 1500. I want to know that the L2 MTU is working as intended. Doing a MAC ping, which I thought would use L2, is still limiting it to 1500 byte packets before they are unsuccessful due to fragmentation being required. I haven't done a packet capture to test, but it seems like the MAC ping is using L3 packets, which makes sense if it needs to use ICMP so that the destination host responds. I have also tried ARP ping, but that appears to ignore the packet size. I'm hoping to do this all Mikrotik to Mikrotik, but may have to resort to using another device off the side. Any suggestions? Regards, Philip Loenneker | Network Engineer | TasmaNet