Larry Letterman wrote: > > 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.
A serial interface doesn't have a MAC address and the protocols used across a serial link don't have MAC addresses in their headers. If I misunderstood your point, just let me know. I'm sure you will! :-) Prisiclla > > 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=62318&t=62251 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
