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Re: [lisp] Eric Rescorla's Discuss on draft-ietf-lisp-rfc6830bis-20: (with DISCUSS and COMMENT)

Dino Farinacci <farinacci@gmail.com> Mon, 15 October 2018 02:20 UTC

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From: Dino Farinacci <farinacci@gmail.com>
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Date: Sun, 14 Oct 2018 19:20:05 -0700
Cc: Benjamin Kaduk <kaduk@mit.edu>, IESG <iesg@ietf.org>, draft-ietf-lisp-rfc6830bis@ietf.org, Luigi Iannone <ggx@gigix.net>, lisp-chairs@ietf.org, albert.cabellos@gmail.com, "BRUNGARD, DEBORAH A" <db3546@att.com>, fmaino@cisco.com, "lisp@ietf.org list" <lisp@ietf.org>
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To: Eric Rescorla <ekr@rtfm.com>
Archived-At: <https://mailarchive.ietf.org/arch/msg/lisp/230AAfTwxSOxGod8TqQyyR1qB7s>
Subject: Re: [lisp] Eric Rescorla's Discuss on draft-ietf-lisp-rfc6830bis-20: (with DISCUSS and COMMENT)
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> > Well this is true, but 6833bis discusses RLOC-reachability and there
> > is a RLOC-probe cache that will tell the ITR when it last heard from
> > the RLOC.
> 
> Just to be clear, it's not "last heard from" that you need, but
> rather "last verifiably responded".

Right agree. 

> > > S 16.
> > >>    Map-Versioning is a Data-Plane mechanism used to signal a peering xTR
> > >>    that a local EID-to-RLOC mapping has been updated, so that the
> > >>    peering xTR uses LISP Control-Plane signaling message to retrieve a
> > >>    fresh mapping.  This can be used by an attacker to forge the map-
> > >>    versioning field of a LISP encapsulated header and force an excessive
> > >>    amount of signaling between xTRs that may overload them.
> > > 
> > > Can't I also set a super-high version number, thus gagging updates?
> > 
> > It doesn’t matter the value. All that matters is that it changed and you should do to the mapping system to get an updated RLOC-set.
> 
> Hmm... S 5.1 of 6834-bis suggests that you can just discard it.

Luigi - what do you think. Do we need rewording?

Dino

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