[olug] IPv6

Justin Reiners justin at hotlinesinc.com
Thu Jul 4 05:41:48 UTC 2013

I am getting a /48 for work. Should have it Monday of cl pulls their head
out of their ass. I figure we are getting thousands of AAAA record hits a
day, might as well. I will be following this thread closely

Most of the confirmations you asked are what I have been told.
On Jul 4, 2013 12:36 AM, "Lou Duchez" <lou at paprikash.com> wrote:

> Anyone have a handle on IPv6, is anyone using it?  I'm finding lots of
> information about IPv6 on the Internet, but not a lot about what to expect
> trying to actually use it.  So I thought I'd ask you.
> 1)    I have found a page that says IPv6 IPs will predictably follow this
> format: bits 1-48 are assigned by my ISP, bits 49-64 are for me to set up
> distinct networks (subnets), and 65-128 are for device assignments on my
> networks.  Is that how it really works?
> 1a)    So any device that needs to get to the Internet will need an IPv6
> address that starts with the 48 bits assigned by the ISP, right?
> 1b)    If the first 48 bits of all Internet-accessing device IPs are set
> by the ISP, it sounds like it will be a gigantic pain in the hinder when I
> change ISPs: changing ISPs will mean changing 128-bit IPs.
> 2)    NAT ceases to be an issue for normal routing, right?  My computer's
> IP as seen by other people on my LAN will be the same as my computer's IP
> as seen from across the Internet.  I will still need to go through a router
> to actually get to the Internet, there just won't be any NAT happening.
> 2a)    This means that I need to explicitly add rules to my firewall to
> provide the protections inherent under NAT: incoming traffic to my networks
> is allowed only if ESTABLISHED / RELATED or if I have a port open to that
> device.  Come to think of it I've already got those rules under IPv4 so
> maybe I won't need to do anything conceptually different.
> 2b)    What does this do to networks with multiple gateways?  I've got a
> friend's network set up to use an alternate connection to a different ISP
> in case the primary one goes down.  This isn't a problem under IPv4 thanks
> to the magic of NAT, but without NAT, how could I pull that off?
> 3)    At present, in IPv4, I get a dynamic IP from my ISP.  Under IPv6,
> will those first 48 bits be static?
> 3a)    Any privacy concerns with that?  Connecting via a non-fixed address
> is "safer" if you're doing anything where anonymity is in your best
> interests.
> 4)    To set up dhcpd on my Linux box, I'm going to need to know the first
> 48 bits, and factor that into my dhcpd config files, right? (Either that or
> else write some sort of script that parses my router's IPv6 address to get
> those first 48 bits.)
> 5)    If I understand correctly, the first 16 bits of an IP address will
> specify the ISP.  That allows for only 65536 ISPs, minus whatever IP ranges
> are used for other purposes (your fec0's and the like).  Isn't that, uh,
> begging to run out?  There are thousands of ISPs in the United States
> already.  Or will only a few of those 65536 be given out to the US and
> those thousands of ISPs will share the first 16 bits?
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