Um roteador nunca encaminhará um pacote com um endereço IPV6 unicast de link local.
Por favor, dê uma olhada neste exemplo: máquina linux com somente endereço de link local tentando pingar ipv6.google.com (endereço ipv6 do escopo global do google):
root@u1010:~# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:0c:29:2d:ff:26
inet addr:172.16.1.130 Bcast:172.16.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe2d:ff26/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:408884 errors:0 dropped:0 overruns:0 frame:0
TX packets:43885 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:151390854 (151.3 MB) TX bytes:6098973 (6.0 MB)
Interrupt:19 Base address:0x2000
root@u1010:~# ping6 ipv6.google.com
PING ipv6.google.com(pw-in-x68.1e100.net) 56 data bytes
From fe80::223:33ff:fe71:6827 icmp_seq=1 Destination unreachable: Beyond scope of source address
From fe80::223:33ff:fe71:6827 icmp_seq=2 Destination unreachable: Beyond scope of source address
From fe80::223:33ff:fe71:6827 icmp_seq=3 Destination unreachable: Beyond scope of source address
From fe80::223:33ff:fe71:6827 icmp_seq=4 Destination unreachable: Beyond scope of source address
e depuração ipv6 pacote no roteador mostra o seguinte ...
Mar 5 14:14:17.240: IPv6: Looking up 2001:XXXX:20::2 [Source FE80::20C:29FF:FE2D:FF26] in FIB
Mar 5 14:14:17.240: IPv6: FIB lookup for 2001:XXXX:20::2 succeeded. if=Tunnel0, nexthop 2001:XXXX:20::2
Mar 5 14:14:17.240: IPV6: source FE80::20C:29FF:FE2D:FF26 (Vlan200)
Mar 5 14:14:17.240: dest 2001:XXXX:20::2 (Tunnel0)
Mar 5 14:14:17.240: traffic class 0, flow 0x0, len 81+14, prot 17, hops 63, forwarding
Mar 5 14:14:17.240: IPv6-Fwd: Beyond scope of source address