ARP Question

[dmce]

Could someone shed some light on this for me please?

If i have 3 computers on a network
A 192.168.1.1
B 192.168.1.2
C 192.168.1.3
and i send a packet from A to B, then ARP will ask for the MAC address of the node with IP 192.168.1.2. This entry is then added to the ARP table. Lets say for whatever reason i change the IP of B to 192.168.1.3 and C to 192.168.1.2.

Now if i send a packet to 192.168.1.2, it already has an entry in the ARP table for that IP but its for B and not C. So the packet goes to the MAC address for B and this is where it gets a little foggy for me. I would imagine the network layer at B eventually says this isnt my IP address? How is it ensured the packet will get to computer C? Does B reject and A then does ARP again?

 

[crashuk]

Could someone shed some light on this for me please?

If i have 3 computers on a network
A 192.168.1.1
B 192.168.1.2
C 192.168.1.3
and i send a packet from A to B, then ARP will ask for the MAC address of the node with IP 192.168.1.2. This entry is then added to the ARP table. Lets say for whatever reason i change the IP of B to 192.168.1.3 and C to 192.168.1.2.

Now if i send a packet to 192.168.1.2, it already has an entry in the ARP table for that IP but its for B and not C. So the packet goes to the MAC address for B and this is where it gets a little foggy for me. I would imagine the network layer at B eventually says this isnt my IP address? How is it ensured the packet will get to computer C? Does B reject and A then does ARP again?

http://www.google.com/microsoft?q=arp&hq=microsoft

 

[dmce]

Cheers. I pretty much know how arp works, my query was specific to a dynamic arp entry existing but me changing the ip of machines that exist in the arp cache.

I was also aware of arp cache having a time out.