Q & A on Minimum Frame Size for Ethernet Q: I read ur bk 'TCP/IP' & would like to enquire on the minimum Ethernet frame size. Minimum frame size is 64 bytes regardless of Ethernet II (DIX) or IEEE 802.3 right? However, when i used MS SMS Network Monitor (Ver2.0) to capture. I discover few packet that's less than 64 bytes. One of them is the BPDU protocol send out by cabletron smart switch, it's only 60 bytes. Is it True that the minimum frame size is 64 with minimum 46 bytes of data? A: The minimum frame size depends on how one measures. In a computer's memory, a frame consists of a 14-octet header plus a 46-octet data area. However, when transmitted over an Ethernet, the frame also includes a 4-octet CRC. So, I suspect that when a monitor reports a length of ``60 bytes'' it is giving the size in memory, without a CRC.