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module09-ipforwV3

module09-ipforwV3 - IP Forwarding Relates to Lab 3 Covers...

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1 IP Forwarding Relates to Lab 3. Covers the principles of end-to-end datagram delivery in IP networks.
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2 Delivery of an IP datagram Ethernet Token Ring LAN Ethernet H1 R1 R2 R3 R4 H2 Network of Ethernet switches Point-to-point link Point-to-point link IP View at the data link layer layer: Internetwork is a collection of LANs or point-to-point links or switched networks that are connected by routers
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3 H1 R1 R2 R3 R4 H2 10.2.1.0/24 20.1.0.0/16 10.1.2.0/24 10.1.0.0/24 10.3.0.0/16 20.2.1.0/28 Delivery of an IP datagram IP View at the IP layer: An IP network is a logical entity with a network number We represent an IP network as a “cloud” The IP delivery service takes the view of clouds, and ignores the data link layer view
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4 Tenets of end-to-end delivery of datagrams The following conditions must hold so that an IP datagram can be successfully delivered 1. The network prefix of an IP destination address must correspond to a unique data link layer network (=LAN or point-to-point link or switched network). (The reverse need not be true!) 2. Routers and hosts that have a common network prefix must be able to exchange IP dagrams using a data link protocol (e.g., Ethernet, PPP) 3. Every data link layer network must be connected to at least one other data link layer network via a router. 1. The network prefix of an IP destination address must correspond to a unique data link layer network (=LAN or point-to-point link or switched network). (The reverse need not be true!) 2. Routers and hosts that have a common network prefix must be able to exchange IP dagrams using a data link protocol (e.g., Ethernet, PPP) 3. Every data link layer network must be connected to at least one other data link layer network via a router.
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5 Routing tables Each router and each host keeps a routing table which tells the router how to process an outgoing packet Main columns: 1. Destination address: where is the IP datagram going to?
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