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Published byJuniper Cross Modified over 8 years ago
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(c) A. Mariën - Ubizen Exercises Network design and configuration
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(c) A. Mariën - Ubizen Transparent NAT
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(c) A. Mariën - Ubizen Before NAT internet router firewall LAN HUB WebServer 188.54.20.0/24 10.20.0.0/16 188.54.20.2
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(c) A. Mariën - Ubizen After NAT: OK? internet router firewall LAN HUB 188.54.20.0/24 10.20.0.0/16 “188.54.20.2” WebServer 10.20.0.2 “188.54.20.2”10.20.0.2
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(c) A. Mariën - Ubizen After NAT: Need ARP fix! internet router firewall LAN HUB 188.54.20.0/24 10.20.0.0/16 “188.54.20.2” WebServer 10.20.0.2 “188.54.20.2”10.20.0.2 MACIF1 MACIF2 MACIF1 = ARP(188.54.20.2)
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(c) A. Mariën - Ubizen RFC 1027 Using ARP to implement transparent subnet gateways Describes transparent subnet division using ARP
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(c) A. Mariën - Ubizen Before HUB Machine A 10.4.5.1 MACA Machine B 10.4.5.3 MACB Machine C 10.4.5.2 MACC Machine D 10.4.5.4 MACD
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(c) A. Mariën - Ubizen After HUB Machine A 10.4.5.1 MACA Machine B 10.4.5.3 MACB Machine C 10.4.5.2 MACC Machine D 10.4.5.4 MACD HUB gateway MACgwleft 10.4.5.253 MACgwright 10.4.5.254
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(c) A. Mariën - Ubizen 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)
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(c) A. Mariën - Ubizen 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
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(c) A. Mariën - Ubizen ARP for load balancing N systems can handle same request Use ARP proxy to provide load balancing
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(c) A. Mariën - Ubizen Network card in promiscuous mode What does it mean? What does it imply?
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(c) A. Mariën - Ubizen
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