Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80:: means FE80::/9

otroan@employees.org Wed, 08 March 2017 10:15 UTC

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Subject: Re: [v6ops] A proposal for draft-ietf-6man-rfc4291bis-07 - FE80:: means FE80::/9
Date: Wed, 08 Mar 2017 11:15:36 +0100
In-Reply-To: <CAO42Z2wOCe16Y5u=YNDQ9PRE5dPaEK3kvtFPnZRWOkUfKmZ2xg@mail.gmail.com>
To: Mark Smith <markzzzsmith@gmail.com>
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Mark,

[...]

>> E.g. you wouldn't say the packet was sent from the source FE80::/128.
> 
> You wouldn't say it, but you could say it, it would be correct.
> 
> Here's an example of their equivalence.
> 
> I assign an IPv6 address to an interface under Linux, and it shows it
> as a /128 prefix.
> 
> [root@opy mark]# ip -6 addr add 2001:db8::1 dev dummy0
> [root@opy mark]# ip -6 addr show dev dummy0
> 9: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 state UNKNOWN qlen 1000
>    inet6 2001:db8::1/128 scope global
>       valid_lft forever preferred_lft forever
>    inet6 fe80::c087:1cff:fe7a:413c/64 scope link
>       valid_lft forever preferred_lft forever
> [root@opy mark]#
> 
> I suppose under Linux, packets are sourced from /128s ;-)

Many implementations conflate configuring an address and configuring an onlink prefix / connected route.
That doesn't mean they are the same thing.

Aren't we already far out into the weeds with this discussion?

Ole