Frame addresses as it traverses Network

Have a question or want to start a discussion? Post it! No Registration Necessary.  Now with pictures!

Threaded View


When a host communicates with another host with a router separating them
(between them), do the host use each others MAC address as the source and
destination addresses, or do they use the MAC address of the Routers port
that they are connected to?
Hoping for "routers MAC address" as answer.
www.cisco.com/warp/public/105/5.html Leeds me to believe the hosts use the
MAC address of the routers  interface, but this may be for a special
situation when useing proxy arp.  Other online sources state "Even thoe the
frames are passing through a router, the source and destination MAC
addresses will not change during the data transmission.  They indicate the
frame will contain the destination and source address of the respective
host.
If the answer is in the Sybex or Boson books, I couldnt find it.

Please help.

Steve C.







Re: Frame addresses as it traverses Network


Steve C wrote:

Quoted text here. Click to load it

MAC addresses stay on the subnet.  So when your talking to a PC across
a router, your PC will use the router's mac as the destination address.
The other PC will see the packet *coming from* the router's mac address.

--

hsb


"Somehow I imagined this experience would be more rewarding" Calvin
**************************ROT13 MY ADDRESS*************************
Due to the volume of email that I receive, I may not not be able to
reply to emails sent to my account. Please post a followup instead.
********************************************************************


Re: Frame addresses as it traverses Network


Thank you thank you thank you!  Sometimes the more studying you do, the more
confused you get.

Quoted text here. Click to load it




Re: Frame addresses as it traverses Network


Hansang Bae wrote:
Quoted text here. Click to load it


Just to clarify,


   Please view in a fixed-width font such as Courier.


  /---\\    ------------------>>>>>
 |PC-A |   +-----------+--------+
 |     |   | DEST MAC  |SRC MAC | ------|
  \\---/    | E0 MAC    |PC-A    |       |
           +-----------+--------+       |
                                        |
                                        |
                                        |      +-------+
                                        ------>|RTR -E0|
                                               |       |
                                               |       |
                                        |------|RTR -E1|
                                        |      +-------+
                                        |
                                        |
           <<<<<<<<----------------------
   ----
  /    \\   +----------+---------+
 | PC-B |  | SRC  MAC | DEST MAC|
  \\    /   | E1 MAC   | PC-B    |
   ----    +----------+---------+


--

hsb


"Somehow I imagined this experience would be more rewarding" Calvin
**************************ROT13 MY ADDRESS*************************
Due to the volume of email that I receive, I may not not be able to
reply to emails sent to my account. Please post a followup instead.
********************************************************************


Site Timeline