Proxy ARP

  • Make two crossover cables using a piece of the Cat 5 twisted pair cable, connectors, and crimping tool.
  • Get connected to the router via a console port.
  • Specify 192.168.1.1/24 and 192.168.2.1/24 addresses in its Ethernet interfaces.
  • Enter no ip proxy-arp command in both Ethernet interfaces.
  • Switch these interfaces on using no shutdown command in the interface configuration mode.
  • Configure the computers in the following way.
Parameter Computer 1 Computer 2
IP Address 192.168.1.2 192.168.2.2
Subnet mask 255.255.0.0 255.255.0.0
Gateway IP 192.168.1.1 192.168.2.1
  • Connect the computers to the router ports using the cables you made. You can use routers or host objects in GNS3.
  • Make sure that the computers receive replies to the ICMP echo-queries from their default gateways.
  • Make sure that one cannot gain access to the computer 2 from the computer 1 (using ICMP too).
  • Use the sniffer and arp –a command of the PC OS in order to find out what is exactly happening in the network. Tell about your observations to the instructor.
  • Enter ip proxy-arp command for both Ethernet interfaces of the router.
  • Take a look at what is going to be changed in the accessibility of one of the computers from the other.
  • Use the sniffer and arp –a and arp -d commands of the PC OS (or clear ip arp and show ip arp for a Cisco router) in order to find out what is exactly happening in the network. Tell about your observations to the instructor.

Download the PDF file with the description of the lab.

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