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Lecture07 - Address Resolution Protocol - inked

Lecture07 - Address Resolution Protocol - inked - Address...

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10/28/2009 1 CNIT 240 CNIT 240 – Data Communications & Networks Address Resolution Protocol How to communicate? Most applications only deal with IP (Layer 3) addressing Network communications requires Layer 2 connectivity Provided by Ethernet How do we map Layer 3 addresses to Layer 2 addresses?
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10/28/2009 2 Address Resolution Direct Mapping Requires the ability to choose BOTH the Layer 2 address and the Layer 3 address Function: P A = f (I A ) & I A = f (P A ) These pairs can be intuitively identified for all hosts to use Ideally requires no change to add/remove hosts Why won’t this work for IP over Ethernet? Dynamic Binding Requires broadcast capability Does not require: code recompile, centralized repository of mappings, significant overhead ARP Allows a host to find the physical address of a target host on the same physical network, given only the target’s network address Physical Address – Ethernet MAC Network Address – IP Address A low-level protocol that hides the physical network addressing, which permits arbitrary assignment of Layer 3 addresses to Layer 2 hosts
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