MTU, a.k.a. Maximum Transmission Unit, is the maximum size of a PDU. The de facto MTU for Ethernet (and thus the Internet in general) is 1500, which can be confirmed in ip addr output:
MTU, a.k.a. Maximum Transmission Unit, is the maximum size of a PDU. The de facto MTU for Ethernet (and thus the Internet in general) is 1500, which can be confirmed in ip addr output: