netdev - Re: arp

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Message-ID: <20150322230848.GA8989@gondor.apana.org.au>
Date:	Mon, 23 Mar 2015 10:08:48 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org,
	roland@...estorage.com
Subject: Re: arp_hash

On Sun, Mar 22, 2015 at 06:58:50PM -0400, David Miller wrote:
>
> But I do not agree with the idea that it is in any way possible to
> stop someone with root access on the physical network from crudding up
> our ARP hash tables.

But you don't need root access to exploit the neighbour hash
table.  You just need a sufficiently large (e.g., /16) route
to a network and anybody on the system can then generate traffic
to it.

Granted these days hardly anybody on IPv4 would have such a route
but if you do then the hash table makes you exposed.

And for IPv6 everybody is potentially exposed.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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