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Re: [secdir] Secdir review of draft-ietf-isis-trill

Stewart Bryant <stbryant@cisco.com> Mon, 20 December 2010 19:03 UTC

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Date: Mon, 20 Dec 2010 19:05:01 +0000
From: Stewart Bryant <stbryant@cisco.com>
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To: Donald Eastlake <d3e3e3@gmail.com>
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Cc: ietf@ietf.org, secdir@ietf.org, Erik Nordmark <nordmark@acm.org>, draft-ietf-isis-trill@tools.ietf.org, Sam Hartman <hartmans-ietf@mit.edu>
Subject: Re: [secdir] Secdir review of draft-ietf-isis-trill
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On 20/12/2010 18:43, Donald Eastlake wrote:
> Hi,
>
> On Mon, Dec 20, 2010 at 11:42 AM, Sam Hartman<hartmans-ietf@mit.edu>  wrote:
>>>>>>> "Radia" == Radia Perlman<radiaperlman@gmail.com>  writes:
>>     Radia>  No objections.  Radia
>>
>>
>> Can I get someone to confirm that the text in the proposed sentences is
>> substantially true?
>> I think so but I'm not an IS-IS expert.
> LSPs have sequences number, etc., and are idempotent. I think only
> Hellos have the potential replay Denial of Service problem. So I would
> suggest changing to:
>
> "Even when the IS-IS
> authentication is used, replays of Hello packets can create
> denial-of-service conditaions; see RFC 6039 for details. These issues
> are similar in scope to those discussed in section 6.2 of
> draft-ietf-trill-rbridge-protocol, and the same mitigations may apply."
>
> Thanks,
> Donald
... as I recall from discussions with the ISIS WG the changes that were 
made to ISIS for TRILL make it more vulnerable to a hello attack than 
vanilla ISIS. This I understand is because there is more work to be done 
in processing a TRILL hello. Is that correct?

- Stewart

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