Set up a "virtual lab" in both VMware Fusion and VrirtualBox. Get roughly the same result in either environment. Packets do not seem to traverse the router itself. No firewall is even installed. HostA, the "router", has 2 NICs on different networks. HostB, the "client", single NIC. Adapters are named to hint at their purpose. Everything is statically configured in /etc/networking/interfaces.
On HostA
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hosta $ ip addr
1: lo
inet6 ::1/128
2: isp0
inet6 2001:db8:f::1/64
inet6 ff80::.../64
3: lan0
inet6 2001:db8:f::2/64
inet6 ff80::.../64
hosta # sysctl -w net.ipv6.conf.all.forwarding=1
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hostb $ ip addr
1: lo
inet6 ::1/128
2: lan0
inet6 2001:db8:f::123/64
inet6 ff80::.../64
hostb $ ip -6 route
2001:db8:f::/64 dev lan0
defailt via 2001:db8:f::2
hostb $ ping 2001:db8:f::2
64 bytes...
hostb $ ping 2001:db8:f::1
From .. Address unreachable
hostb $
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hosta # tcpdump -i isp0
<nothing>
hosta # tcpdump -i lan0
...ICMP6, neighbor solicitation, who has...
hosta #
Everything says that IPv6 is not to be NATted in any way, and the block of Unique Global Addresses are to be used internally and simply routed. I am presuming that I am given a block of 2001:db8f::1/64 for the purposes of testing.
Any help would be greatly appreciated.