From: Ned (ccie2004@excite.com)
Date: Wed Jul 14 2004 - 23:58:57 GMT-3
Can anyone shed a little light on the difference between ethernet types (802.2, 802.3, Ethernet 2) and what is the minimum and maximum frame size. I have read different information on various sites. Also, when referred to I always assume in relation to ethernet that when they say octet it means the same as bytes like for eg. max ethernet frame is 1518 octets(?? is that correct).
My thoughts:
802.2 (Ethernet 2) has the type field
802.3 has the length field
**That's the general difference but can someone elaborate. For eg. DSAP, SSAP. What ethernet type is commonly used and how to tell which one is being used without a packet analyzer.
Max User Data: 1460 Bytes
Max Frame Size: 1518 Bytes (1460 + 20( ip header) + 20 (tcp header) + 18 Bytes for the Ethernet Header (this does not include the preamble and the Start of frame Delimiter)
What would the payload be? (would it include the ethernet header or would it be 1500 which is the 1460 + tcp header + ip header)
I have asked quite a few questions but I really want to make sure I have a good understanding of this and if I don't I would really like to. Thanks a bunch.
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