netdev - Re: [RFC PATCH] dont create cached routes from ARP requests

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Date:	Wed, 22 Sep 2010 20:34:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	uweber@...aro.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] dont create cached routes from ARP requests

From: Ulrich Weber <uweber@...aro.com>
Date: Wed, 22 Sep 2010 18:22:09 +0200

> Do we really have to cache routes based on ARP requests?
> Are there any other reasons than expecting new connections?
> 
> Attached is a patch to skip caching for ARP requests
> not related to local IP addresses or ARP proxy.
> 
> Background: At home I have two Internet connections, DSL and Cable.
> DSL is the primary uplink while Cable is the secondary.
> My Cable ISP is flooding me with ARP request from 10.0.0.0/8,
> which creates routes via the primary uplink.
> There are thousands of cached routes and after some time
> I get "Neighbour table overflow" messages.

If you get neighbour table overflows, something is holding a reference
to the routing cache entry and/or the neighbour entries those routing
cache entries are attached to.

If these really are transient entries, they should be trivially
garbage collected and not cause any problems at all.
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