 | 1 | initial version |
"Sent" is the key word here; the destination MAC address is the MAC address to which a packet is being sent, so that's the address to check. The source MAC address just says who's sending it; they can send broadcast or unicast packets, so the source address can't tell you whether it's broadcast or unicast.
By the way, there's another possibility - multicast - so:
The IG bit is the low-order bit of the first byte, so if, for example, it's 0x80, it's unicast, as that bit is clear, but if it's 0x81, it's multicast, as that bit is set.
