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Exercises

Exercises. Network design and configuration. Transparent NAT. internet. Before NAT. WebServer. 188.54.20.2. router. firewall. LAN HUB. LAN HUB. 10.20.0.0/16. 188.54.20.0/24. internet. After NAT: OK?. “188.54.20.2”. WebServer. 10.20.0.2. router. firewall. LAN HUB. LAN HUB.

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Exercises

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  1. Exercises Network design and configuration (c) A. Mariën - Ubizen

  2. Transparent NAT (c) A. Mariën - Ubizen

  3. internet Before NAT WebServer 188.54.20.2 router firewall LAN HUB LAN HUB 10.20.0.0/16 188.54.20.0/24 (c) A. Mariën - Ubizen

  4. internet After NAT: OK? “188.54.20.2” WebServer 10.20.0.2 router firewall LAN HUB LAN HUB 188.54.20.0/24 10.20.0.0/16 “188.54.20.2” 10.20.0.2 (c) A. Mariën - Ubizen

  5. internet After NAT: Need ARP fix! “188.54.20.2” WebServer MACIF2 10.20.0.2 MACIF1 router firewall LAN HUB LAN HUB 188.54.20.0/24 10.20.0.0/16 MACIF1 = ARP(188.54.20.2) “188.54.20.2” 10.20.0.2 (c) A. Mariën - Ubizen

  6. RFC 1027 • Using ARP to implement transparent subnet gateways • Describes transparent subnet division using ARP (c) A. Mariën - Ubizen

  7. Before Machine C 10.4.5.2 MACC Machine A 10.4.5.1 MACA HUB Machine B 10.4.5.3 MACB Machine D 10.4.5.4 MACD (c) A. Mariën - Ubizen

  8. After Machine C 10.4.5.2 MACC Machine A 10.4.5.1 MACA HUB MACgwright 10.4.5.254 gateway HUB Machine B 10.4.5.3 MACB Machine D 10.4.5.4 MACD MACgwleft 10.4.5.253 (c) A. Mariën - Ubizen

  9. Gateway ARP • Left • Macgwleft = ARP(10.4.5.2) • Macgwleft = ARP(10.4.5.4) • Macgwleft = ARP(10.4.5.253) • Right • Macgwright = ARP(10.4.5.1) • Macgwright = ARP(10.4.5.3) • Macgwright = ARP(10.4.5.254) (c) A. Mariën - Ubizen

  10. Gateway routes • Route to host 10.4.5.1 via 10.5.4.253 • Route to host 10.4.5.3 via 10.5.4.253 • Route to host 10.4.5.2 via 10.5.4.254 • Route to host 10.4.5.4 via 10.5.4.254 (c) A. Mariën - Ubizen

  11. ARP for loadbalancing • N systems can handle same request • Use ARP proxy to provide loadbalancing (c) A. Mariën - Ubizen

  12. Network card in promiscuous mode • What does it mean? • What does it imply? (c) A. Mariën - Ubizen

  13. (c) A. Mariën - Ubizen

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