disabling client use of SLAAC

John Payne john at sackheads.org
Sun Mar 7 04:33:53 CET 2010

On Mar 6, 2010, at 6:42 PM, Bernhard Schmidt <berni at birkenwald.de>  

> On 06.03.2010 22:41, Mark Smith wrote:
> Bernhard
>>> Autoconf doesn't work for on>64 bit prefixes, so extending it to  
>>> an 80
>>> is a [interesting] way of disabling it completely.
>> So is announcing RA Prefix Information options without the
>> autonomous address-configuration flag set. I'd doubt anybody
>> would be willing to standardise hack like that when there is  
>> already a
>> proper way to stop nodes autoconfiguring addresses.
> Except it doesn't work everywhere, for example it's not available in  
> the most recent NX-OS 4.2 (Cisco Nexus 7000). You can either do  
> "ipv6 nd suppress-ra" on that platform (which had (has?) the nasty  
> problem of one RA being sent during software upgrade, hello SLAAC on  
> >500 cluster hosts), or use a prefixlen != /64.

That also doesn't stop 6500s from responding to RS queries which is  
enough for some Linux boxes to auto configure, it seems....

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