Address Resoultion Protocol Questions.

HI
If my router has two different networks connected to two ethernet interfaces and if a host in n/w 1 wants to communicate with a host in n/w 2 how the Address resolution protocol works in the below condition [Assume that all the arp tables of all the hosts and router are empty.]
1. THE DEFAULT GATEWAYS FOR ALL THE HOSTS IN BOTH THE NETWORKS ARE SET TO THEMSELVES.
My questions
1. Will the host in n/w 1 will arp for itself or will it arp for the router or will it arp for the destination. [Remember both the netwros are different]
Please explain the setp by step process. Many thanx

in this case if H1 itself is a gateway and it want to reach H2, source MAC address will be H1s MAC add and destination MAC address will be MAC addr of H2 or MAC addr of intermediate gateway between H1 and H2 if any depending on the below cases.
1. If H1 is directly conected to H2, then when H1 will send ARP broadcast, H2 will send its MAC addr in ARP reply packet.
2. if there is a Layer 3 device acting as gateway between H1 and H2, then H1 will send ARP broadcast message and gateway of H1 will respond with ARP reply with its MAC address because L3 device won't forward broadcast packets to another network. H1 can use this MAC addr to build frame to send it across to H2.
below links can give you overview of default gateway concept.
http://www.microsoft.com/technet/community/columns/cableguy/cg0903.mspx
http://en.wikipedia.org/wiki/Default_gateway
http://www.inetdaemon.com/tutorials/internet/ip/default_gateway.shtml
hope this helps ..

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Bill,
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Address Resoultion Protocol Questions.

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