Proxy ARP allows router to respond to ARP request that is intended for remote host - Networking

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• Prajakta Pandit   -Posted on 20 Oct 15
  
  - Proxy ARP can help machines on a remote subnets without configuring routing or a default gateway.
  
  - Proxy ARP is the technique in which on host, usually a router, answers ARP requests intended for another machine.
  
  Advantages of Proxy ARP :
  
  - The main advantage of proxy ARP is that it can be added to a single router on a network and does not disturb the routing tables of the other routers on the network.
  
  - Proxy ARP must be used on the network where IP hosts are not configured with a default gateway or do not have any routing intelligence.
  
  Disadvantages of Proxy ARP :
  
  - Hosts have no idea of the physical details of their network and assume it to be a flat network in which they can reach an destination by sending an ARP request. But using ARP for everything has disadvantages, these are :
  
      1. It increases the amount of ARP traffic on the segment.
  
      2. Hosts need larger ARP tables in order to handle IP-to-MAC address mappings.
  
      3. Security can be undetermined.
  
  

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