Hi Martin, Hi Group,
The preamble does not count to the length of the frame. Between the source
MAC adress and the data field there is a 2 byte typecode field in Ethernet
v2 (Arpa). In Ethernet IEEE 802.3 there is the 2 byte length field instead
of the type field.
Ethernet v2 (ARPA) Frameformat:
DA: 6 octets
SA: 6 octets
Type: 2 octets
Payload(Data): up to 1500 octets
Frame Check Sequence (FCS): 4 octets
sum: 1518 octets
greetings,
Reinhold
--
Reinhold Fischer [EMAIL PROTECTED]
CCNP/SunCSA/HP Certified Consultant for Network Management
On Mon, 2 Oct 2000, M. A. wrote:
> Dear group,
>
> I have one question which has bugged me for ages, that is, what exactly is the
>maximum length for an Ethernet frame (assuming no other encapsulation like ISL)? The
>number 1518 keeps on getting mentioned, but I just can't seem to work that number out:
>
> The way I see is:
>
> Preamble: 8
> DA: 6
> SA: 6
> Data: 1500
> FCS: 4
>
> All those add up to 1524!!!! How do people get the number of 1518???
>
> Much appreciate any help!
>
> Martin
>
>
**NOTE: New CCNA/CCDA List has been formed. For more information go to
http://www.groupstudy.com/list/Associates.html
_________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
