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Unit4b_MobileIP - Unit 4.4 Mobile IP A Routing Example...

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Unit 4.4 Mobile IP
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1.0.0.1 1.0.0.2 1.0.0.254 a c 3.0.0.254 a a 3.0.0.253 3.0.0.252 c c 2.0.0.253 2.0.0.3 b 2.0.0.4 4.0.0.5 4.0.0.252 b b b b Host 1 Host 2 Host 3 Host 4 Host 5 Router A Router B Router C A Routing Example: 1.0.0.1 2.0.0.4 Target/Prefix-Length Next Hop Interface 1.0.0 .0 / 24 3.0.0.254 c 2.0.0 .0 / 24 direct b 3.0.0 .0 / 24 direct c Router B’s routing table Ethernet A Network Prefix = 1.0.0 High-Speed Fiber Backbone Network Prefix = 3.0.0 Ethernet B Network Prefix = 2.0.0 Ethernet C Network Prefix = 4.0.0
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1.0.0.1 1.0.0.2 1.0.0.254 a c 3.0.0.254 a a 3.0.0.253 3.0.0.252 c c 2.0.0.253 2.0.0.3 b 2.0.0.4 4.0.0.5 4.0.0.252 b b b b Host 1 Host 2 Host 3 Host 4 Host 5 Router A Router B Router C A Routing Example: 1.0.0.1 2.0.0.4 Target/Prefix-Length Next Hop Interface 1.0.0 .0 / 24 3.0.0.254 c 2.0.0 .0 / 24 direct b 3.0.0 .0 / 24 direct c Router B’s routing table Ethernet A Network Prefix = 1.0.0 High-Speed Fiber Backbone Network Prefix = 3.0.0 Ethernet B Network Prefix = 2.0.0 Ethernet C Network Prefix = 4.0.0 ?
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Mobility Problem The packet is undeliverable Host 4 is not connected to Ethernet B . Router B will then send a Host Unreachable error message back to Host 1. Q: How to solve it?
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Solution 1: Host-Specific Route Place host-specific routes in the routing tables of Router A, B, and C as follows: Target/Prefix-Length Next Hop Interface 2.0.0.4 / 32 3.0.0.252 c Target/Prefix-Length Next Hop Interface 2.0.0.4 / 32 3.0.0.252 c Target/Prefix-Length Next Hop Interface 2.0.0.4 / 32 direct b Router A Router B Router C Is this a good solution?
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