Question about arp caches

Shawn Peng yisupeng at
Tue Nov 29 02:19:19 EST 2016

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 at 
> <mailto:yisupeng at>> 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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