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Re: ISP support models Re: IPv6 NAT?

2008-02-19 16:23:24
Hi, Iljitsch,

From: "Iljitsch van Beijnum" <iljitsch(_at_)muada(_dot_)com>

On 19 feb 2008, at 16:30, Spencer Dawkins wrote:

If you really want this, you can simply create a loopback interface
with address fc00::1 on it and users can type "http:// [fc00::1]/" (ok,
so the brackets are annoying, but no NAT helps against that) and the
users can connect to that address regardless of what the addresses
used on the LAN are.

Were you thinking that the loopback interface would be on the "working
machine" Dan mentioned, or the inner interface on the LAN router  device 
(in
my case, 192.168.10.1 would be my wireless router plugged into my  cable
modem) that is having connectivity issues on its outer interace?

Because I'm almost sure the second case is what Dan's talking about...

Yes, and that's what I'm talking about, too. I sometimes forget that  not 
everyone spends their days configuring routers  :-)  where  loopback 
interfaces have a very different function than they do on  hosts. Since 
you're sending all your packets to the router, the  packets addressed to 
the router's FC00::1 address, which is tied to  the loopback interface 
simply because loopback interfaces never go  down, will be processed 
locally so you get to manage the router.  Obviously this only works for 
your default gateway, and, as I said  before, a good service discovery 
mechanism is still a very good idea.

Ah - thanks. Since we were talking about the user's view from a host, I was 
off in RFC 3330-land.

Thanks,

Spencer, who was thinking of

   127.0.0.0/8 - This block is assigned for use as the Internet host
   loopback address.  A datagram sent by a higher level protocol to an
   address anywhere within this block should loop back inside the host.
   This is ordinarily implemented using only 127.0.0.1/32 for loopback,
   but no addresses within this block should ever appear on any network
   anywhere [RFC1700, page 5]. 


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