Mailinglist Archive: opensuse (908 mails)

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Re: [opensuse] Re: dhcpv6-pd
On 06/07/2016 08:14 AM, Per Jessen wrote:
James Knott wrote:

On 06/07/2016 07:18 AM, Per Jessen wrote:
You can split that /56 into multiple /64s with openSUSE as a router.
Also, why do you think your addresses will change? Dhcpv6-pd uses
something called DUID which ties your prefix to the hardware, so
it shouldn't change.
If it doesn't change why are we even bothering with this whole
discussion? Just configure your IPv6 prefix it statically and you're
On IPv4, my dhcp address changed so seldom, it was virtually static.
However, on rare occasion, my ISP did network changes that required
address changes. If I had done used static config, I might find
myself without a working address or conflicting with someone else.
The same applies with dhcpv6-pd. The aprefix will likely not change,
but you don't do anything to keep it from happening if necessary.
To answer your own question - that is precisely why Koenraad thinks
his "addresses will change".

The question is how often. If frequently, as some ISPs do with IPv4,
then yes he has a problem. If seldom, as is the case with my IPv4
address, then no, it's not, as changes will be rare.

Incidentally, with my ISP, the IPv4 lease time is 7 days. That means I
could power off my modem or router for almost a week and still retain
the address, as my ISP does not force unnecessary changes. I expect the
same will apply with my IPv6 prefix.

Here's some info on this:

As long as the ISP maps the prefix to the DUID, the prefixes should stay
the same, unless it becomes necessary for the ISP to make some change.
For example, this might happen when my ISP switches from /64 to another
prefix. It would also change, if I change hardware.

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