[ixpmanager] Trouble adding v6 /64

[Martin J. Levy]

All,

    https://tools.ietf.org/html/rfc5963
    IPv6 Deployment in Internet Exchange Points (IXPs)

Martin

> On Jan 15, 2018, at 3:52 AM, Nick Hilliard <nick at inex.ie> wrote:
> 
> Nishal Goburdhan wrote:
>> ie, when you apply for your next block of IPv4 addresses for your
>> peering lan, at afrinic, you won’t be getting addresses assigned from
>> 196.223.x, but from 196.60.y.   so the “consistency” that you are aiming
>> for, would be unrealised in the future.  unless, of course, you plan to
>> change your IPv6 addresses at the same time - and that’s a totally
>> unnecessary pain.
> 
> Agreed that explicitly tying the IPv6 address to the exact ipv4 address
> is something that will bite in future years.  We had several iterations
> of IPv6 addressing at INEX before we realised that there was no
> compelling argument to encode information of any form in ipv6 addresses,
> and that doing so would invariable cause problems down the line where
> the terms for encoding the information changed, but there wasn't a
> compelling reason to renumber the ipv6 address.
> 
> In other words, the for anything other than simplest: start off at
> address number 0 and increment.  We eventually decided to make the
> decimal representation  of the last ipv4 octet the same as the hex
> representation of the last octet in ipv6, i.e.
> 
> 186.6.36.6 - 2001:7f8:18::6
> 186.6.36.150 - 2001:7f8:18::150
> 
> We considered plenty of other schemas along the way (e.g. ipv4 address
> mapping, ASN encoding, and curiously a scheme which guaranteed that each
> IPv6 address would end up in a different multicast group for ND
> announcements (long story, but there were some nasty bugs in the early
> days of Cisco 6500 kit, ouch)).
> 
> Obviously, each IXP is different, and you can do whatever you want from
> the UI in 4.7.0.
> 
> The only encoding that INEX uses in either IPv4 or IPv6 is to reserve
> all single-digit addresses for IXP use only (and we didn't even succeed
> at this, oops).
> 
> Nick
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