IPv6 tunneling not routing packets

[Brook Milligan <brook%biology.nmsu.edu@localhost>]

I am trying to set up an IPv6 tunnel via Hurricane Electric’s tunnelbroker service, but packets are not routed through the tunnel.

After registering the tunnel, their instructions for NetBSD are to configure the network as follows:

ifconfig gif0 create
ifconfig gif0 tunnel x.x.x.x y.y.y.y
ifconfig gif0 inet6 X:X:X:X::2 Y:Y:Y:Y::1 prefixlen 128
ifconfig gif0 mtu 1480
route -n add -inet6 default Y:Y:Y:Y::1

where
x.x.x.x is the public IPv4 address of the local server,
y.y.y.y is the public IPv4 address of the remote tunnel server,
X:X:X:X::2 is the IPv6 address assigned to the local end of the tunnel, and
X:X:X:X::1 is the IPv6 address assigned to the remote end of the tunnel.

Afterwards, I should be able to ping6 X:X:X:X::1 successfully, i.e., send packets through the tunnel.  However, all I get is the following:

# ping6 Y:Y:Y:Y::1
PING6(56=40+8+8 bytes) X:X:X:X::2 --> X:X:X:X::1
100% packet loss

Here is the configuration of gif0 reported by ifconfig:

gif0: flags=0x8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1480
	tunnel inet x.x.x.x --> y.y.y.y
	status: active
	inet6 X:X:X:X::2/128 -> X:X:X:X::1 flags 0
	inet6 fe80::Z:Z:Z:Z%gif0/64 ->  flags 0 scopeid 0x5
	
Here is what I believe to be the relevant subset of the IPv6 routing table from netstat -rn -f inet6:

Internet6:
Destination                             Gateway                        Flags    Refs      Use    Mtu Interface
default                                 X:X:X:X::1                     UGS         -        -      -  gif0
X:X:X:X::1                              X:X:X:X::2                     UHC         -        -      -  gif0
X:X:X:X::2                              gif0                           UHl         -        -      -  lo0

Are there any kernel options that need to be enabled?  This is an 11.0_BETA kernel from late November.  

Or sysctl variables that need to be set?

I would geatly appreciate more eyes on this and ideas on how to troubleshoot the problem.  This is my first foray into IPv6 land and I’m not finding any useful debugging information.  Most everything says, now ping6 the remote end of the tunnel; it should work.

Thank you very much.

Cheers,
Brook