Reminding arp
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Reminding - ARP. Two machines on a given network can communicate only if they know each other’s physical network address ARP (Address Resolution Protocol) serves for mapping from high-level IP address into low level MAC address. 10.4.10.91 00:11:22:33:44:55:bc. Reminding – ARP.

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Reminding - ARP

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Reminding arp

Reminding - ARP

  • Two machines on a given network can communicate only if they know each other’s physical network address

  • ARP (Address Resolution Protocol) serves for mapping from high-level IP address into low level MAC address.


Reminding arp1

10.4.10.91

00:11:22:33:44:55:bc

Reminding – ARP

ARP Response (00:11:22:33:44:55:12)

ARP Request (10.4.10.90)

10.4.10.90

00:11:22:33:44:55:12

10.4.10.86

00:11:22:33:44:55:2e

10.4.10.20

00:11:22:33:44:55:6b

10.4.10.23

00:11:22:33:44:55:40


Proxy arp

Proxy ARP

  • Proxy ARP (also called promiscuous ARP or ARP hack) is a technique used to map a single IP network prefix into two physical addresses.

    • Using the same network address space for more than one physical address

  • Assume that there are 2 networks A and B connected by router R that runs Proxy ARP

  • Using Proxy ARP, R can use the same net id for both networks.


Proxy arp1

10.10.1.5

10.10.1.3

10.10.1.4

Proxy ARP

Network A: 10.10.1.x/24

R

PPP

.

Network B:

10.10.1.x/24


Proxy arp2

Proxy ARP

  • Router R replies to ARP requests that are generated by hosts on the PPP connection (Network B), in which the target IP is on network A, namely it sends its MAC address.

    • R know which hosts are connected through the PPP.

  • These host assume that the destination host are on the same physical network.

  • In their ARP table the router MAC address is associated with the destination IP address.


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