Re: Fwd: Question about arp caches

Yisu Peng <yisupeng@xxxxxxxxx> · Wed, 30 Nov 2016 04:45:55 -0500



    Oh, I see. Thanks. Appreciate that.

    
    On 11/30/2016 3:42 AM, Anupam Kapoor
      wrote:

    
          On Wed, Nov 30, 2016 at 1:46 PM, Yisu
            Peng <yisupeng@xxxxxxxxx>
            wrote:

            So, how is the kernel
              check those staled arp entries? Or, what is the mechanism
              that the kernel uses to find the out of date entries?
          
          
          ok sure, well, each
            neighbor entry (struct neighbour) has a 'timer' (which is
            created during neighbor creation i.e.
            during neigh_alloc(...)). this timer gets 'serviced' by
            'neigh_timer_handler(...)', which is the per neighbor
            garbage collector handler. 
          

          when the state of
            the neighbor becomes NUD_FAILED, the neighbor is collected
            via invokation of 'neigh_release(...)' as indicated earlier.
          

          --
          kind regards
          anupam
          

                In the beginning
                    was the lambda, and the lambda was with Emacs, and
                    Emacs was the lambda. 
              
            
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