sakura-vps/FreeBSD/6rdについて、ここに記述してください。

http://research.sakura.ad.jp/2011/01/12/tunnel-6rd-freebsd/ /設定

FreeBSD 8.2 では　stf が使えるらしい。

lo0 の現状 

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=3<RXCSUM,TXCSUM>
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 
        inet6 ::1 prefixlen 128 
        inet 127.0.0.1 netmask 0xff000000 
        nd6 options=3<PERFORMNUD,ACCEPT_RTADV>

%grep ipv6 rc.conf 

#firewall_client_net_ipv6="2001:db8:2:1::/64" # IPv6 network prefix for
#firewall_simple_iif_ipv6="ed1" # Inside IPv6 network interface for "simple"
#firewall_simple_inet_ipv6="2001:db8:2:800::/56" # Inside IPv6 network prefix
#firewall_simple_oif_ipv6="ed0" # Outside IPv6 network interface for "simple"
#firewall_simple_onet_ipv6="2001:db8:2:0::/56" # Outside IPv6 network prefix
ipv6_enable="NO"                # Set to YES to set up for IPv6.
ipv6_network_interfaces="auto"  # List of network interfaces (or "auto").
ipv6_defaultrouter="NO"         # Set to IPv6 default gateway (or NO).
#ipv6_defaultrouter="2002:c058:6301::"  # Use this for 6to4 (RFC 3068)
ipv6_static_routes=""           # Set to static route list (or leave empty).
#ipv6_static_routes="xxx"       # An example to set fec0:0000:0000:0006::/64
#ipv6_route_xxx="fec0:0000:0000:0006:: -prefixlen 64 ::1"
ipv6_gateway_enable="NO"        # Set to YES if this host will be a gateway.
ipv6_router_enable="NO"         # Set to YES to enable an IPv6 routing daemon.
ipv6_router="/usr/sbin/route6d" # Name of IPv6 routing daemon.
ipv6_router_flags=""            # Flags to IPv6 routing daemon.
#ipv6_router_flags="-l"         # Example for route6d with only IPv6 site local
#ipv6_router_flags="-q"         # If you want to run a routing daemon on an end
#ipv6_network_interfaces="ed0 ep0"      # Examples for router
#ipv6_prefix_ed0="fec0:0000:0000:0001 fec0:0000:0000:0002"  # Examples for rtr.
#ipv6_prefix_ep0="fec0:0000:0000:0003 fec0:0000:0000:0004"  # Examples for rtr.
#ipv6_ifconfig_ed0="fec0:0:0:5::1 prefixlen 64" # Sample manual assign entry
#ipv6_ifconfig_ed0_alias0="fec0:0:0:5::2 prefixlen 64" # Sample alias entry.
ipv6_default_interface="NO"     # Default output interface for scoped addrs.
stf_interface_ipv6_ifid="0:0:0:1"       # IPv6 interface id for stf0.
stf_interface_ipv6_slaid="0000" # IPv6 Site Level Aggregator for stf0
ipv6_faith_prefix="NO"          # Set faith prefix to enable a FAITH
ipv6_ipv4mapping="NO"           # Set to "YES" to enable IPv4 mapped IPv6 addr
ipv6_ipfilter_rules="/etc/ipf6.rules"   # rules definition file for ipfilter,