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Chap 10 IP Addressing

Chap 10 IP Addressing. Andres, Wen-Yuan Liao Department of Computer Science and Engineering De Lin Institute of Technology andres@dlit.edu.tw http://www.cse.dlit.edu.tw/~andres. Overview. The details of IP address classes, network and node addresses, and subnet masking

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Chap 10 IP Addressing

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  1. Chap 10 IP Addressing Andres, Wen-Yuan Liao Department of Computer Science and Engineering De Lin Institute of Technology andres@dlit.edu.tw http://www.cse.dlit.edu.tw/~andres

  2. Overview • The details of IP address classes, network and node addresses, and subnet masking • The concepts you need to understand before configuring an IP address

  3. Subnetting • The purpose of IP address • The role of host network on a routed network • The role of broadcast addresses on a routed network • The assignment of router interface and network IP addresses

  4. IP address • 32-bit dotted-decimal format • Router interfaces must be configured with an IP address

  5. The role of host network • A host address • all 1s: IP broadcast • all 0s: "this network" or "the wire itself" • The routing table contains entries for network or wire addresses

  6. Broadcast Addresses • The messages are intended to be seen by every host on a network • Directed broadcasts • Be directed into a specific network/subnet • All 1s in the host portion of the address • Flooded broadcasts (255.255.255.255) • Local broadcasts

  7. Router Commands • ip addresses command • ip host command • ip name-server command • Enable and disable DNS on a router • Show hosts command

  8. ip addresses command • Establish the logical network address of an interface • term ip netmask-format: specify the format of network masks • bit count • dotted-decimal (default) • Hexadecimal

  9. ip host command • Make a static name-to-address entry in the router's configuration file

  10. ip name-server • Defines which hosts can provide the name service • Maximum of six IP addresses

  11. Show hosts command • Display a cached list of host names and addresses

  12. Verifying Address Configuration • Verification commands • The telnet and ping commands • The trace command

  13. trace command • traceis supported by IP, CLNS, VINES, and AppleTalk • !H-- Not forwarded by the router, usually due to an access list • P-- The protocol was unreachable • N-- The network was unreachable • U-- The port was unreachable • *-- Time out

  14. Summary • 32-bit logical address: IP address • Broadcast messages • ip address / ip host / ip name-server / show hosts • telnet, ping, and trace

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