[6bone] IPv6 Site Multicast

[Harish Nair]

Hi,

I have a question about IPv6 site Multicasting. Our IPv6 network here is
composed of two subnets. Subnet 1 has prefix 3ffe:b80:17d2:1 and subnet 2
has prefix 3ffe:b80:17d2:2. Each subnet has a FreeBSD Router in its
domain. The two FreeBSD routers are "IPv6" connected using gif tunnels
using the existing IPv4 routing framework. The router in subnet 1 is
connected to freenet6 (through another gif tunnel.

Router 1
--------

gif0: flags=8251<UP,POINTOPOINT,RUNNING,ALLMULTI,MULTICAST> mtu 1280
        inet6 fe80::260:8ff:fe11:d903%gif0  prefixlen 64
        physical address inet 128.4.1.3 --> 128.4.2.16
gif1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
        inet6 fe80::260:8ff:fe11:d903%gif1  prefixlen 64
        inet6 3ffe:b80:3:197b::2 --> 3ffe:b80:3:197b::1  prefixlen 128
        physical address inet 128.4.1.3 --> 206.123.31.114


Router 2
--------
gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
        inet6 fe80::250:daff:fedd:5333%gif0  prefixlen 64
        physical address inet 128.4.2.16 --> 128.4.1.3

Our requirement is to set up NTP multicast servers at our site (subnet1
and subnet2). The NTP IPv6 site multicast address is ff05::101. An NTP
packet sent to this address (or any address starting with ff05::) from any
machine on subnet1 or subnet2 should be received by all machnies on both
subnets. The router on subnet 1 should drop all ff05 packets received from
freenet6 and should not route any ff05 poackets over to freenet6.

I would aprreciate any help in this regard...

Thanks,
Harish