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From: David Miller <davem@davemloft.net>
Subject: Re: [PATH] dev: reusing unregistered ifindex values in net_device
Date: Thu, 18 Nov 2010 08:01:39 -0800 (PST)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 18 Nov 2010 16:37:08 +0100

> Two bugs 
> 
> 1) ifindex is not initialized : you'll be suprised of random values
> 
> 2) ifindex should not be reused. You'll be surprised so applications can
> break. SNMP comes to mind.

Right, the current algorithm is intentionally trying to avoid new
devices from using indexes that were used by another device in the
past.