lec9 - UCI University of California Irvine EECS 161...

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EECS 161 - Introduction to Computer Networking Scott Jordan Local Area Networks / Ethernet UCI University of California, Irvine Ethernets connected by Routers: (Walrand fig. 2.5) A Packet Router is like a Packet Switch, but it can also modify the packet header (in particular the Ethernet addresses).
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EECS 161 - Introduction to Computer Networking Scott Jordan Local Area Networks / Ethernet UCI University of California, Irvine Ethernets connected by Routers: Example: At source, Ethernet header contains ( s,r 1 ). IP header contains ( S,D ). Router R ’s routing table contains an entry ( D, E 2 ). It copies the packet to Ethernet E 2 and modifies the Ethernet header from ( s,r 1 ) to ( r 2 ,d ).
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EECS 161 - Introduction to Computer Networking Scott Jordan Local Area Networks / Ethernet UCI University of California, Irvine Ethernets connected by Routers: Note the router needs both a routing table and an ARP table. Also note that the router completely segments the Ethernets, e.g. E 1 doesn’t need to know Ethernet addresses on E 2 .
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lec9 - UCI University of California Irvine EECS 161...

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