A=1 L=0 PIO

[Bjørn Mork]

Mikael Abrahamsson <swmike at swm.pp.se> writes:
> On Tue, 16 Aug 2016, Sander Steffann wrote:
>
>>> I'm trying to figure out what a "normal" currently deployed in the field IPv6 host would do if it receives an RA with PIO /64 where L=0 and A=1.
>>
>> On an implementation level what I have seen on Linux is that the L flag determines whether the route 2001:db8::/64 -> eth0 is installed or not.
>
> Ok, thanks everybody. So it'll still do A=1 style addressing (EUI64,
> privacy extension addressing etc)? Will it perform DAD?

Use the source, Luke1

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/net/ipv6/addrconf.c#n2523

That is:

 if (L) then add route
 if (A) then do autoconf

Without any side looking at the other flag.  Specifically: The value of
L does not affect the interpretation of A.  Which is pretty much what
RFC 4861 says too, AFAICT

So the answers to both your questions is "yes".


Bjørn