Cisco Newbie wrote: > > 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 > >
Yep. If the IP packet is destined for a non-Ethernet WAN interface, the appropriate L2 header is encapsulated around it. In the case of T1 PPP, an "HDLC-like" header is used. There no longer is any source or destination MAC address to be found. They are both stripped off at the ingress Ethernet interface of the router. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=62280&t=62251 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
