Re: Question about arp caches

Shawn Peng <yisupeng@xxxxxxxxx> · Tue, 29 Nov 2016 02:19:19 -0500



    I find a lot references of the function neigh_release(), can you
      direct me to the one that releases a staled arp entry? Thanks.

    
    On 11/29/2016 12:50 AM, Anupam Kapoor
      wrote:

    
          On Tue, Nov 29, 2016 at 10:40 AM,
            Shawn Peng <yisupeng@xxxxxxxxx>
            wrote:

            
              I'm
                reading the code about arp protocol. It seems like the
                kernel uses

                the neigh_table structure to keep track of caches,
                right? 
            
            
              yes.
              

              There
                should

                be some code that remove the stale entries in the cache,
                but I didn't

                find the code that does this job. Does anyone have an
                idea?
            
            
              look
                at neigh_release(...) and neigh_destroy(...). basically,
                neigh_release(...) decrements the reference count of a
                neighbor, and neigh_destroy(...) frees it when this
                reference count reaches zero.
               
          
          --
          kind regards
          anupam
          

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