[c-nsp] IPV6 in general was Re: Large networks

Grzegorz Janoszka Grzegorz at Janoszka.pl
Thu Aug 27 06:14:37 EDT 2009


Phil Mayers wrote:
> Grzegorz Janoszka wrote:
>> Daniel Verlouw wrote:
>>> No real experience with HSRP though, can anyone shed some light on that?
>>> I understand it only works for link-local addresses?
>>
>> Yes, unfortunately it is only link-local. I am just trying to figure 
>> it out how to marry link-local with our global ipv6 assignments.
> 
> That's now the way it works AFAICT.
> 
> Basically, the routers still send router-advertisments. However, the 
> link-local address in the next-hop is the HSRPv6 virtual IP, and floats 
> between the active & backup.
> 
> So you only *need* the link-local.

But it is strange indeed. We tell everyone that v6 is just the same as 
v4, but just the issues as above makes our customers scary.

So, we assign 2001:0db8:85a3:08d3::/64 on a customer port, with a 
gateway fe80:0db8:85a3:08d3::1 - how does it look? Is it the same as we 
do with v4? :)

Do you have any plans for such IP division? I just thought about 
replacing first 16 bits of public v6 address with fe80, but maybe you 
have better ideas.

-- 
Grzegorz Janoszka


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