Re: [RFC] Change default ipv6 network from fec0/10 (site local) to fe80/10 (link local)

[Samuel Thibault]

Hello,

Philippe Mathieu-Daudé, le mer. 27 janv. 2021 22:46:13 +0100, a ecrit:
> On 1/27/21 8:13 PM, Doug Evans wrote:
> > I happened to notice QEMU's default for the ipv6 network is fec0::/10
> > which is deprecated (RFC3879).
> > I think(!) an obvious replacement is fe80::/10, link local.

fe80::/10 is really a different thing, I don't think we want to use it.

We can use some prefix in fc00::/7, such as fd00::/8.
It "just" needs checking with various guest OS, to check that it doesn't
break the default behavior.

Samuel

Re: [RFC] Change default ipv6 network from fec0/10 (site local) to fe80/10 (link local)

[Philippe Mathieu-Daudé]

Hi Doug,

Cc'ing more developers.

On 1/27/21 8:13 PM, Doug Evans wrote:
> Hi.
> 
> This is just an information gathering question. I don't know enough to
> formally propose the change.
> I happened to notice QEMU's default for the ipv6 network is fec0::/10
> which is deprecated (RFC3879).
> I think(!) an obvious replacement is fe80::/10, link local.
> 
> Has anyone thought about this issue or know of reasons why we shouldn't
> make this change?

I'm a bit worried this could break various scripts and firewall rules
where this is the expected default range...

[RFC] Change default ipv6 network from fec0/10 (site local) to fe80/10 (link local)

[Doug Evans]

Hi.

This is just an information gathering question. I don't know enough to
formally propose the change.
I happened to notice QEMU's default for the ipv6 network is fec0::/10 which
is deprecated (RFC3879).
I think(!) an obvious replacement is fe80::/10, link local.

Has anyone thought about this issue or know of reasons why we shouldn't
make this change?