Re: Forwarding Packets With Link Local Destination Addresses

Alejandro Acosta <alejandroacostaalamo@gmail.com> Fri, 08 January 2021 01:34 UTC

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Subject: Re: Forwarding Packets With Link Local Destination Addresses
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From: Alejandro Acosta <alejandroacostaalamo@gmail.com>
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Date: Thu, 7 Jan 2021 21:34:28 -0400
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Hello,

   My apologies for using this thread, I have a valid point. My comment 
inline:


On 7/1/21 1:53 PM, Ron Bonica wrote:
>
> Folks,
>
> According to RFC 4291, “routers must not forward any packets with 
> Link-Local source or destination addresses to other links”.
>
> I interpret this statement to include packets that contain routing 
> headers. For example, it forbids an SRv6 packet whose final segment 
> has a locator that begins with FE80.
>
   In LACNIC we ran a project called Natmeter [1] for about 2 years, we 
obtained a lot of interesting data during this period [2].

   The case is the following, we detected some end-user devices with 
only Link Local addresses (exactly, no GUA nor ULA) that were 
successfully natted and using the web.

   Is it ok?, do you consider it as a forwarding of a packet? was it a 
crazy result? (we saw few samples of this)


Thanks,


[1] 
https://prensa.lacnic.net/news/en/research/lacnic-project-detects-massive-presence-of-nat-boxes-in-the-region

[2] Well, actually it still available with much less successful measurement


> Does everyone share this interpretation? If so, do RFC 4291 or RFC 
> 8200 make this sufficiently clear?
>
>                                                             Ron
>
>
> Juniper Business Use Only
>
>
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