If one runs an iperf connection between a node 'A' and a node 'B' is it possible that the arp entry expires from one of the nodes. [I have a simple mininet topology and while running an iperf connection between two hosts -- one of the arp expires -- Can be checked using wireshark!]. My main question is why does arp expire mid connection. Isn't the arp entry supposed to expire when the entry is idle?
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1Yes, the timers of the neighbour cache should be rewinded by active connections. Not sure what can cause this to fail. – eckes Oct 01 '17 at 05:15
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ARP expires where? One of the nodes? Are they on the same subnet? – Oct 01 '17 at 22:33
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The nodes are on the same subnet. A has the entry of B and B has the entry for A. B is the server while A is the client and entry of A on B expires. – George J. Adams Oct 02 '17 at 16:28
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Most likely not. An arp cache entry doesn't get deleted if the network stack deems it as being referenced, so even a stale entry won't "fail" from a packet sending/forwarding perspective and will remain in the ip neighbor cache. The traffic itself has to go idle for a period of time before neighbor cache entries are removed.
rjmcmahon
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