Some of the reason may be the specs for detecting a collision and and/or runt type frames...However this may be incorrect..
Larry Letterman Cisco Systems [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Zeitz Sent: Wednesday, April 10, 2002 3:00 PM To: [EMAIL PROTECTED] Subject: RE: packet size [7:41079] Well, maybe the reason why its 64 bytes, is because of CSMA/CD parameters call for 64 bytes. Would this make sense? Now what about CRC? Is that extra bits, or is CRC part of CSMA/CD. I am asking a lot of questions today :O Looking at some of this, I am surpised how little Doyles Vol 1 and 2 TCP/IP mention this stuff. Maybe its more for the CCIE outline. -----Original Message----- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Wednesday, April 10, 2002 5:18 PM To: [EMAIL PROTECTED] Subject: RE: packet size [7:41079] The minimum size for an Ethernet frame is 64 bytes. This includes the Ethernet header and FCS, but not the preamble or inter-frame gap. The minimum Ethernet frame size has to do with the ability of a sender to recognize a collision reflecting back from the other side of a maximum-sized Ethernet segment, while still sending the frame. The minimum size for Token Ring is 18 bytes, if I recall. This includes the header and FCS, but not the starting or ending delimiter or the frame status byte. I didn't know IP had a minimum, although RFC 791 does say that "Every internet destination must be able to receive a datagram of 576 octets either in one piece or in fragments to be reassembled." Priscilla At 04:05 PM 4/10/02, Larry Letterman wrote: >64 bytes ... > >Priscilla is this correct... > > >Larry Letterman >Cisco Systems >[EMAIL PROTECTED] > > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of >Brian Zeitz >Sent: Wednesday, April 10, 2002 12:32 PM >To: [EMAIL PROTECTED] >Subject: packet size [7:41079] > > >Oops I found the answer, I thought it was over 500, cause I was looking >at IPV6 specs. > > > > > Minimum Packet Size > > >According to Ethernet specifications, the size of a packet should be >between 64 Bytes and 1518 Bytes. Therefore, the minimum packet size is >64 Bytes. ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=41118&t=41079 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
