dhcpv6 configuration

[shafi at bbnl.co.in]

Hi,

    I have installed isc-dhcp-server in ubuntu 12.04 and configured the 
dhcpv6 . customer can get ipv6 address and dns address from my dhcpv6 
server.but they are not able to reach  up to my gateway.here i have 
mention my configuration.hope i mesh up something here please help me 
what to do.

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default-lease-time 600;
max-lease-time 7200;
subnet6 2404:1f00:31::/48 {
         # Range for clients
         range6 2404:1f00:31::2 2404:1f00:31::254;
         # Additional options
         option dhcp6.name-servers 2001:4860:4860::8888;
         option dhcp6.domain-search "bbnl.in";
}


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Regards
shafi