Re: Length of Ethernet frame
You left out the type/length field: 2 You don't count the preamble (it is used to sync the frame). Thus, DA: 6 SA: 6 Length/Type: 2 Data: 1500 FCS: 4 = 1518. Regards, MLC "M. A." [EMAIL PROTECTED] wrote in message 000a01c02c2d$b1f640b0$[EMAIL PROTECTED]">news:000a01c02c2d$b1f640b0$[EMAIL PROTECTED]... 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
Re: Length of Ethernet frame
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]
Re: Length of Ethernet frame
Hello, Sometimes they don't count the preamble Regards, Leonard Ong, ST, CCNP RS+Voice, CCDP RS, CSE, SAIRGNU LCP, MCP, BCP PT. Internusa Data Digitalindo **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]
Length of Ethernet frame
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
