The address of the remote endpoint of the tunnel
(i.e., the destination address used in the outer IP
header). If the address is unknown or the tunnel is
not a point-to-point link (e.g., if it is a 6to4
tunnel), the value is 0.0.0.0 for tunnels over IPv4 or
:: for tunnels over IPv6. The type of this object is
given by h3cTunnelIfAddressType.