Re: IPv6 and DNS

[Ivan Shmakov <ivan@gray.siamics.net>]

>>>>> Johan Kullstam <kullstj_ml@verizon.net> writes:

[…]

 > My ISP does not offer IPv6.

	With a static IPv4 address, setting up 6to4 is as simple as
	adding a bit to interfaces(5), like:

## An 6to4 tunnel
auto 6to4
iface 6to4 inet6 v4tunnel
    ## IPv4 address: 192.0.2.34
    ## $ printf 2002:%x%02x:%x%02x::1\\n 192 0 2 34
    address  2002:c000:222::1
    netmask  16
    local    192.0.2.34
    endpoint 0.0.0.0
    ## Use the following 6to4 gateway (anycast) if it works
    gateway  ::192.88.99.1
    ## Use an HE.NET router if it doesn't
    # gateway  ::216.66.80.98
    ## Mark our routes not explicitly configured as unreachable
    post-up   ip route add unreachable "$IF_ADDRESS"/48 || true
    post-down ip route del unreachable "$IF_ADDRESS"/48 || true
    ## AIUI, IPv6 forwarding cannot be enabled on a per-interface basis
    # post-up  sysctl -w net.ipv6.conf."$IFACE".forwarding=1

	(Don't forget # ifup -a after the edits are done.)

	Or, a 6in4 tunnel may be requested at http://tunnelbroker.net/.
	The relevant interfaces(5) bit would be like:

## A he.net 6in4 tunnel
auto he-ipv6
iface he-ipv6 inet6 v4tunnel
    address  2001:db8:1234:5678::2
    netmask  64
    ## Local IPv4 address
    local    192.0.2.34
    ## Remote IPv4 address (that of the 6in4 router)
    endpoint 192.0.2.211
    gateway  2001:db8:1234:5678::1
    ## Add unreachable's as appropriate
    # post-up   ip route add unreachable 2001:db8:1234:4200/56 || true
    # post-down ip route del unreachable 2001:db8:1234:4200/56 || true
    ## AIUI, IPv6 forwarding cannot be enabled on a per-interface basis
    # post-up  sysctl -w net.ipv6.conf."$IFACE".forwarding=1

	Should the IPv4 address be dynamic (but not NAT'ed, RFC 1918
	one), simply installing Miredo (# apt-get install miredo) would
	give one a single IPv6 address.

	And in the case of NAT'ed IPv4, it's still possible to register
	for a free-of-charge tunnel service at http://sixxs.net/ and use
	AICCU (# apt-get install aiccu.)

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