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The Still Useful, but Still Short Life of an Ethernet Frame

Nov 24,2008 by alperen

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The Still Useful, but Still Short Life of an Ethernet Frame

Earlier, R1 began its logic when it received an Ethernet frame that was addressed to itself. Likewise, R2 begins its logic the same way. In this case, R2 receives the frame that R1 sent to R2's Ethernet address, with the frame containing the original packet Hannah sent to the web server. This first step in R2's logic matches R1's:

1.
Check the incoming frame's FCS. If errors exist, discard the frame.

2.
If no errors were found, discard the Ethernet header and trailer, leaving the original IP packet.

In the sample internetwork, after R2 receives a frame, it is left with the same IP packet, whose source IP address is 8.1.1.1 (Hannah), and whose destination is 130.4.3.3 (web server).


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