In most cases you will only re-write the source mac address when traversing across a L3 device. If you go across a layer 2 network, all the mac address's would typically be part of the same broadcast domain and not need to be changed.
If you go across a T1 or Frame it will still be mapped to or have an assigned IP Address that constitutes a layer 3 hop and write its mac address in the frame. However if I am wrong here, Priscilla or Howard or Chuck will let me know...:) Larry Letterman Network Engineer Cisco Systems ----- Original Message ----- From: "Cisco Newbie" To: Sent: Friday, January 31, 2003 11:42 AM Subject: RE: MAC Address [7:62251] > First, thanks for all that responded. One clarification that I need address > is the following: > > If I cross a L3 router and the outgoing interface is something other than > Ethernet, will the L2 frame show a new MAC address? In other words, if my > outgoing interface is say T1 PPP or even a dial-up, should I be seeing a new > MAC address? > > Is it only when I cross a L3 device AND my outgoing interface is a share > medium like Ethernet that a new MAC address will be placed on the frame? > > Thanks. > > > > --------------------------------- > Do you Yahoo!? > Yahoo! Mail Plus - Powerful. Affordable. Sign up now [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=62306&t=62251 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
