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Re: ipv6 question

Michael Fleming wrote:
On Sun, 31 May 2009 23:38:52 +0200
Michael Casey <michaelcasey73 gmail com> wrote:


I just want to ask one big question :)

If I would have an IPv6 address [home pc, behind a router -
supporting ipv6 e.g.: openwrt, ISP gives ipv6], then I can see an
IPv6 address with ifconfig, on the PC e.g.: "Z"
So that's my "very unique address". - "Z"

Can that be "seen on the internet", the "Z" address? so anyone can
ping me from outside, or do an nmap?

Yes, if the IPv6 address has a "global" prefix (2001:: 2002:: etc) -
fe80:: etc are "link local" addresses and are site specific - they
won't be available to the wider Internet.

I have a related question. If I set up a tunnel to forward IPv6 thru IPv4, the existing setups seem to use part of my IPv4 address as part of the IPv6 address. Fair enough, but is there some way to get a permanent IPv6 allocation, such that if my primary ISP goes out for any reason, I can use my secondary instead? I'd like to set up some servers on VMs in my DMZ[1] for testing.

Or are there private addresses what the router gives to my pc.: eg.:
with ipv4 a router could give and that IP couldn't be
pinged/nmapped from outside (More Secure???)
Because I heard that there will be no NAT with IPv6?

There's no NAT in IPv6, at least in the "traditional" IPv4 way.

 If you're only getting fe80:: et. al addresses (the link-local
 addresses as above) you should be fine however.

What will happen to e.g.: a windows xp pc using IPv6? The "C$, D$....
shares" will be visible to anyone if they know the password?
sorry for the trivial question... :S :) and thank you for any answer

If the host isn't firewalled and has globally routed IPv6 allocations
then yes they would be available (they'd need to know Administrator
passwords for the admin shares above though)

[1] DMZ is setup like this:

Internet--(firewall)--[DMZ network, public servers]--(firewall)--pvt_net

Bill Davidsen <davidsen tmr com>
  "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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