Question about arp caches

Anupam Kapoor anupam.kapoor at
Tue Nov 29 00:50:46 EST 2016

On Tue, Nov 29, 2016 at 10:40 AM, Shawn Peng <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?

> 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

In the beginning was the lambda, and the lambda was with Emacs, and Emacs
was the lambda.
-------------- next part --------------
An HTML attachment was scrubbed...

More information about the Kernelnewbies mailing list