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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

Exercises

Network design and configuration

(c) A. Mariën - Ubizen

transparent nat

Transparent NAT

(c) A. Mariën - Ubizen

before 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

(c) A. Mariën - Ubizen

after nat ok

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

after nat need arp fix

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

rfc 1027
RFC 1027
  • Using ARP to implement transparent subnet gateways
  • Describes transparent subnet division using ARP

(c) A. Mariën - Ubizen

before
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

after
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

gateway arp
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

gateway routes
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

arp for load balancing
ARP for loadbalancing
  • N systems can handle same request
  • Use ARP proxy to provide loadbalancing

(c) A. Mariën - Ubizen

network card in promiscuous mode
Network card in promiscuous mode
  • What does it mean?
  • What does it imply?

(c) A. Mariën - Ubizen