FreeBSD ipv6 rc.conf settings issue

[Matthew Seaman]

Gary Kline wrote:

 
> This caught my interest this morning so I set up a commented-out trial in
> /etc/rc.d for my ipv6 entry; the one I had in my database /etc/namedb/* files
> blew my connection sky-high recently.
> 
> Does this seem plausible:
> 
> 
> #
> ## ipv6 config
> #
> 
> # ipv6_enable="YES"
> # ipv6_defaultrouter="2002:d1b4:d5d2::"
> # ipv6_default_interface="em0"
> # ipv6_gateway_enable="YES"
> 
> given that my Adress record is 	209.180.213.210 ?
> 
> tia, gents,

So you're using 6to4 tunnelling as described in stf(4)?  That's a quite
different setup to what has been discussed previously in this thread. 
I think 6to4 is, if not deprecated, certainly not the normal way of getting
IPv6 connectivity nowadays.  Generally you'ld get an address space allocation
from your ISP, or failing that, a tunnel broker like Hurricane Electric[*].

Anyhow, as stf(4) says, you need to encode your IPv4 address as hex in the
6to4 address -- that looks correct:

% perl -e 'map { printf "%x\n", $_ } split( /\./, shift );' 209.180.213.210
d1
b4
d5
d2

However 2002:d1b4:d5d2:: is *your* network address, and having it as the default router sounds wrong to me.  You need to assign addresses from that
range to your hosts -- which you can do automatically by enabling rtadvd(8)
on your gateway machine and rtsold(8) on your clients.  Also, to use 6to4
you need to create a 'stf0' interface and make that the ipv6_default_interface.

This is all independent of setting up IPv6 related items in your DNS.  Get
the IPv6 connectivity working first -- use ping6 and traceroute6 with IPv6
numbers to confirm connectivity, and then worry about DNS settings.

	Cheers,

	Matthew

[*] Which is pretty crazy given that the prediction is IPv4 space is
going to run out around 2012[+].  All of the major ISPs and NSPs really
should be providing IPv6 natively by now.

[+] Potential for another IT-feeding-frenzy-panic scenario like the run
up to Y2K.  Make sure IPv6 is on your CV...

-- 
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey     Ramsgate
                                                  Kent, CT11 9PW

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