Thanks Mark,
I was not aware of that before.
Thanks again,
washam

2011/7/15 Mark Smith <[email protected]>:
> Hi,
>
> On Fri, 15 Jul 2011 11:01:30 +0800
> Washam Fan <[email protected]> wrote:
>
>> Hi,
>>
>> I don't know if it is legal when I manually set a unicast address with
>> IID=0. Linux allows that and RFC4291 doesn't explicitly prohibit that.
>> I assume it is legal, Right?
>>
>
> That's the subnet router anycast address, so you probably shouldn't use
> it without the anycast flag being set when you assign it. Using it as a
> conventional unicast address might make it interact
> unexpectedly/badly with things like duplicate address detection.
>
> See RFC5453, "Reserved IPv6 Interface Identifiers".
>
>
> Regards,
> mark.
>
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