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[IPv6]Re: Mail regarding draft-mishra-6man-variable-iids

Gyan Mishra <hayabusagsm@gmail.com> Sat, 14 September 2024 03:11 UTC

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Fri, 13 Sep 2024 23:11:09 -0400
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To: Lorenzo Colitti <lorenzo@google.com>
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CC: Nagendra Kumar <nagendrakumar.nainar@gmail.com>, draft-mishra-6man-variable-iids@ietf.org, 6man <6man@ietf.org>
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Subject: [IPv6]Re: Mail regarding draft-mishra-6man-variable-iids
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On Fri, Sep 13, 2024 at 10:15 PM Lorenzo Colitti <lorenzo@google.com> wrote:

>
>
> On Fri, 13 Sept 2024, 14:26 Gyan Mishra, <hayabusagsm@gmail.com> wrote:
>
>> On Thu, Sep 12, 2024 at 4:58 PM Mike Simpson <mikie.simpson@gmail.com>
>> wrote:
>>
>>> Ok so ND cache exhaustion won’t happen with a /80 but will on a /64?
>>>
>>
>> 2^64 is 18,446,744,073,709,551,616
>> 2^48 is 281,474,976,710,656
>>
>
> This shows very clearly why this argument is flawed.
>
> Moving from /64 to /80 will not prevent or mitigate ND cache exhaustion.
> You can build a router with 1M ND cache entries per link (maybe), but you
> can't build a router with 281 trillion ND cache entries. It would require
> 8TB of RAM per link just for the ND cache.
>

    Gyan> Most routers have a ND cache limit option so it does appear the
NCE attack vector can be easily mitigated.

>

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