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Re: ndp

Fernando Gont <> writes:

> On 02/18/2013 06:57 AM, Ignatios Souvatzis wrote:
>> On Mon, Feb 18, 2013 at 07:40:58AM +0100,
>> wrote:
>>> exists there a maximum size of the ndp table? how can I determine
>>> the maximum number of entries?
>>> currently 'ndp -a | wc -l' reports 1492 entries and I am not sure if
>>> is a problem or not.
>> *Currently*, the ndp and the arp table are implemented as part of
>> the routing PATRICIA tree (but have link-level addresses instead of
>> network addresses as next-hop). So there's no limit different other
>> than the general routing table limitations. Hm, I think mostly
>> kernel memory limitations.
> That is actually a problem: it can be exploited for DoS purposes. --
> even a remote address scanning attack might cause that as a side effect.

That may be true of most uses of a routing-table like structure.  I
am inclined to keep mechanisms for limits on entries separate from the
data structure choice, because what I think we want is resilience
against attack and good performance in normal cases.

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