On Sep 15, 2017, at 6:02 AM, Nikolay Shopik <shopik@nvcube.net> wrote:

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On 11 Sep 2017, at 21:55, Owen DeLong <owen@delong.com> wrote:

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On Sep 11, 2017, at 3:35 AM, Nikolay Shopik <shopik+lists@nvcube.net> wrote:

On 10/09/2017 14:25, Saku Ytti wrote:

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However I don't think market would generally appreciate the implications linklocal brings to traceroute, where least bad option would be just to originate hop-limit exceeded from loop0, with no visibility on actual interface.

rfc5837 would help but it seems market universally ignore it for some reason unknown to me (lack of interest and IPv6 adoption?)

We find LL is simpler, operation wise at some cases.

How’s that work out for you on routers with the same MAC address on multiple interfaces when you’re trying to troubleshoot ECMP trace routes?

Owen

We dont have such cases where LL used but i belive rfc i mention is exactly solve that problem

It _MIGHT_ help in some circumstances if it were ubiquitously or universally implemented, however, as you yourself noted, it is not. You were offering advice to someone without investigating the characteristics of his network. That advice could well have negative tradeoffs which you neglected to mention. I felt a duty to point them out. Owen