On a modem, you will need to run a script (generally this is done by the Internet provider) to clear the ARP table. On a server, you will require an elevated command prompt. I appreviate interface as int to save on typing. On a PC or Server, the command is netsh interface ip delete arpcache. For example, if you replace one network device with another, assigning the same static IP, existing network devices may need to have ARPCACHE cleared. Since the ARP cache resolves MAC address with IP address, the reason to clear the cache is if there is a duplication of an IP address in the table. If I am wrong, then prove me wrong please.I may learn some thing good from you as I am still on the learning stage. Secondly, my answer relates to your reply on the top of discussion, real time applications means VOIP or Video confrencing and you know how it helps and if you clear how it effects.įinally, I found the best option which is DAI would be better approach to configure on your network.
so you can imagine what broadcasts msgs will do. When you clear the arp cache, devices will have to resolve the mac address again, hence they start sending the arp request which is actually the broadcast, and here we are not talking about lab enviroment, where you have only two pcs, I am talking about real work scenario where you may have more than 40 pcs attached to the network. I know I could have been wrong but the interviewer was very fast and I had to no time to think on anything and just answer that straight away becasue interview last for more than an hour and half, so you can imagine. Sent from Cisco Technical Support iPhone App In most cases you try not to clear the ARP tables unless you really have to. Clearing the ARP tables fixed the issue in this case as at this point the new router could take over and respond to ARP requests from the switches using proxy ARP. The switches could ping and ARP the new router but still thought many addresses outside of the local subnet needed to be sent to the old router. the switches with no default gateway assigned still had many entires in their ARP tables pointing to the old router who didn't have routes back to the home office anymore. The old router was given a different LAN IP. The new router was setup with the same IP as the old to keep the default gateway the same. This is where the router can respond to an ARP request to an address that isn't on the local subnet. Prior to my hiring, the LAN switches are setup with no default gateway and could only contact the home office through a process known as proxy ARP. I had a probably rare situation where a remote site needed a router upgrade while the old stayed up.
I didn't really see anyone that gave a scenario when clearing the ARP cache is needed as opposed to rebooting a router or switch.
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