I'm setting up a new Linode and while I'm not using IPv6 directly at this time, I'd like to configure it to be IPv6-ready. In my "Remote Access" tab, I see the following under "DNS Resolvers":

97.107.133.4
207.192.69.4
207.192.69.5
2600:3c03::2
2600:3c03::3

However, I only see the IPv4 addresses above in /etc/resolv.conf and no mention of the IPv6 ones. The Linode documentation doesn't seem to mention this at all, either. IPv6 seems to be set up though and I can ping ipv6.google.com just fine.

You don't need them as a necessary condition of using IPv6. IPv6 is just a transport layer for DNS, and whether or not you use IPv6 to query DNS will not impact the results of the query(*).

The reason the IPv6 resolvers don't appear there is because DHCPv4 is used to populate /etc/resolv.conf automatically, and it doesn't know about the IPv6 resolvers. You are more than welcome to disable DHCP and use a static network configuration, which will let you do whatever you want with /etc/resolv.conf.

(*) For pedants: We'll assume all the DNS servers involved neglect the source IP address of the query when deciding which records to return. That's true in this case.

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Thanks for the help! I'm using static networking actually. While we're on the subject, can you tell me if my /etc/network/interfaces file looks correct? I'm running Debian 6. I added in IPv6 support, but I'm not sure if I did it correctly.

# localhost 

auto lo
iface lo inet loopback

# eth0 interface 

auto eth0 eth0:0

# public

iface eth0 inet static
   address   [Linode IPv4 IP]
   netmask   255.255.255.0
   gateway   [Linode IPv4 Gateway IP]

# private

iface eth0:0 inet static
   address   [Linode IPv4 Private IP]
   netmask   255.255.128.0

# IPv6

iface eth0 inet6 static
   pre-up   modprobe ipv6
   address  [Linode IPv6 IP]
   up       echo 0 > /proc/sys/net/ipv6/conf/all/autoconf
   netmask  64
   gateway  fe80::1

After restarting, I noticed /proc/sys/net/ipv6/conf/all/autoconf was still set to 1 instead of 0. `ping6 fe80::1` also doesn't seem to work? But I'm able to `ping6 ipv6.google.com` just fine. Here's the output of `ip -6 address show eth0`:

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 [Linode IPv6 IP]/64 scope global dynamic 
       valid_lft 43199sec preferred_lft 43199sec
    inet6 [Linode IPv6 Link-Local IP]/64 scope link 
       valid_lft forever preferred_lft forever

My network config looks something like:

auto eth0
iface eth0 inet static
    address 97.107.134.213
    netmask 255.255.255.0
    gateway 97.107.134.1
    up /sbin/ip addr add 2600:3c03::f03c:91ff:fe96:1dc9 dev eth0 # main
    up /sbin/ip -6 route add default via fe80::1 dev eth0
    up /sbin/ip addr add 2600:3c03::13:3025/64 dev eth0 preferred_lft 0 # mail.sodtech.net
    up /sbin/ip addr add 2600:3c03::13:3123/64 dev eth0 preferred_lft 0 # ntp.sodtech.net
    up /sbin/ip addr add 2600:3c03::13:3142/64 dev eth0 preferred_lft 0 # xn--1xa.hoopycat.com
    up /sbin/ip addr add 2600:3c03::13:3700/64 dev eth0 preferred_lft 0 # mo.lestor.net
    # ....

I don't turn off autoconf or do anything particularly unusual. If it works, it works. -rt

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