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Re: [Idr] Fwd: New Version Notification for draft-spaghetti-idr-bgp-sendholdtimer-05.txt

Robert Raszuk <robert@raszuk.net> Mon, 15 August 2022 12:07 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 15 Aug 2022 14:07:22 +0200
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To: Job Snijders <job@fastly.com>
Cc: Gyan Mishra <hayabusagsm@gmail.com>, "idr@ietf. org" <idr@ietf.org>
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Subject: Re: [Idr] Fwd: New Version Notification for draft-spaghetti-idr-bgp-sendholdtimer-05.txt
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Job,

Sure you can custom craft "EBGP peer from hell" easily.

The point was that forcing such behaviour in any decent shipping BGP
implementation is not easy.

Thx,
R

On Mon, Aug 15, 2022 at 1:45 PM Job Snijders <job@fastly.com> wrote:

> On Mon, Aug 15, 2022 at 12:50:42PM +0200, Robert Raszuk wrote:
> > Please also observe that testing this is not that easy. It first
> > requires broken BGP implementation and either instrumented BGP I/O to
> > stop accepting arriving messages or forced by TCP peer's zero-window.
> > We are dancing here around a very unlikely/marginal event to occur in
> > practice.
>
> Wrong. Testing this is super easy! Ben Cartwright-Cox authored running
> code that triggers the problem in 100% of COTS vendors 100% of the time.
>
> We call this the 'peer from hell', described 2 years ago:
> https://mailarchive.ietf.org/arch/msg/idr/DQTWtKesQs6sd8M7rYN6UMCd_QE/
>
> PCAPs of being connected to a 'peer from hell' are available at:
> https://mailarchive.ietf.org/arch/msg/idr/wViscLxTTcfFI_YGtb3Viq7-RhQ/
>
> Kind regards,
>
> Job
>

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