This does not include the 18 bytes of Ethernet headers and FCS that surround the IP packet. There’s 20 bytes for the IP header, 20 bytes for the TCP header, leaving 1460 bytes for the data payload. So a standard IP packet is 1500 bytes long. For the sake of conversation, I’ll assume going forward that we are referring to TCP only but I did put the UDP header length in there just for reference. Here’s your average looking IP packet encapsulated in an Ethernet Header. One of the ones that often gets overlooked is MTU (Maximum Transmission Unit), MSS (Maximum Segment Size) and all of the funs tuff that comes along with it. There are so many low level pieces of a network stack that you don’t really have to know (although you should) to be an expert at something like OSPF, BGP, or any other higher level networking protocol. One of the truly fascinating things about networking is how much of it ‘just works’.
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