Re: IPv4 v IPv6
On Monday 17 June 2019 05:59:52 am Jonathan Dowland wrote:
> On Mon, Jun 17, 2019 at 10:05:11AM +0100, mick crane wrote:
> >Without knowing anything about it I'm wondering if I should request
> > an IPv6 range from my ISP to use locally.
>
> You don't need a global IPv6 address allocation in order to have local
> IPv6 addresses. Much like 127.0.0.0/8 (etc.) for IPv4 there are
> reserved ranges.
>
> If you want to have globally-accessible IPv6 addresses for machine(s)
> in your home, then you would need to request a range from your ISP (if
> they aren't already assigning you one). But I would start with
> learning a bit more about it first, and experimenting in the local
> range if that helps.
>
> >A network card have IPv4 and IPv6 addresses that are different, not
> >the same address in different notation ?
>
> That's right.
>
> >Then with firewalling do you need to specify both IPv4 and IPv6
> > ranges ?
>
> Yes, generally, anywhere you may have specified an IPv4 address or
> range you would need to rethink or add IPv6 equivalents.
But that opens yet another container of worms. If I arbitrarily assign
ipv6 local addresses, and later, ipv6 shows up at my side of the router,
what if I have an address clash with someone on a satellite circuit in
Ulan Bator. How is that resolved, by unroutable address blocks such as
192.168.xx.xx is now?
What I've read so far has not addressed this serious security concern. Or
even mentioned it. If in the future all addressing is by dhcpd6, how do
the other machines on my local net, advertise their presence to the
other machines on my local net. So I can still ssh -Y vna.coyote.den for
instance, if I can ever make ssh work to a win-10-home edition box.
Thats a rarely used hookup at best. Presently the hosts file duplicated
on all machines fill's this requirement.
These are the questions I'll need to address if and when ipv6 shows up on
my side of the router. And the wiki pages I've read, haven't discussed
it.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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