gistfile1.txt

root@wanjet1:~# cat /etc/wide-dhcpv6/dhcp6c.conf 
# Default dhpc6c configuration: it assumes the address is autoconfigured using
# router advertisements.

profile default
{
  information-only;

  request domain-name-servers;
  request domain-name;

  script "/etc/wide-dhcpv6/dhcp6c-script";
};
root@wanjet1:~# cat /etc/wide-dhcpv6/dhcp6c-script
#!/bin/sh
# dhcp6c-script for Debian/Ubuntu. Jérémie Corbier, April, 2006.
# resolvconf support by Mattias Guns, May 2006.

RESOLVCONF="/sbin/resolvconf"

[ -f /etc/default/wide-dhcpv6-client ] && . /etc/default/wide-dhcpv6-client

if [ -n "$new_domain_name" -o -n "$new_domain_name_servers" ]; then
    old_resolv_conf=/etc/resolv.conf
    new_resolv_conf=/etc/resolv.conf.dhcp6c-new
    rm -f $new_resolv_conf
    if [ -n "$new_domain_name" ]; then
        echo search $new_domain_name >> $new_resolv_conf
    fi
    if [ -n "$new_domain_name_servers" ]; then
        for nameserver in $new_domain_name_servers; do
            # No need to add an already existing nameserver
            res=$(grep "nameserver $nameserver" $old_resolv_conf)
            if [ -z "$res" ]; then
                echo nameserver $nameserver >> $new_resolv_conf
            fi
        done
    fi

    # Use resolvconf if available
    if [ -h "$old_resolv_conf" -a -x "$RESOLVCONF" ]; then
        for IFACE in $INTERFACES; do
            cat $new_resolv_conf | $RESOLVCONF -a $IFACE
        done
    else
        # To preserve IPv4 informations...
        cat $old_resolv_conf >> $new_resolv_conf
        chown --reference=$old_resolv_conf $new_resolv_conf
        chmod --reference=$old_resolv_conf $new_resolv_conf
        mv -f $new_resolv_conf $old_resolv_conf
    fi
fi

exit 0