"Steven M. Bellovin" <smb%cs.columbia.edu@localhost> writes: > 21:26:30.393860 IP6 (hlim 255, next-header: ICMPv6 (58), length: 56) > fe80::211:xxxx:xxxx:xxxx > ff02::1: [icmp6 sum ok] ICMP6, router > advertisement, length 56 > hop limit 64, Flags [none], pref medium, router lifetime 1800s, > reachable time 0s, retrans time 0s > source link-address option (1), length 8 (1): 00:yy:yy:yy:yy:yy > 0x0000: 00yy yyyy yyyy > prefix info option (3), length 32 (4): 2001:zzz:z:zzz::/56, Flags > [onlink, auto], valid time 2592000s, pref. time 604800s > 0x0000: 38c0 0027 8d00 0009 3a80 0000 0000 2001 > 0x0010: zzzz zzzz zzzz 0000 0000 0000 0000 > > Both speak v6 successfully with manually configured v6 addresses on that > net. /56?? It's fine for you to get a /56 from your provider (static or BGP), but the convention is that prefixes for a link are /64. So that's probably running afoul of a sanity check later, at least for stateless autoconfiguration. If you have a /56, then that leaves you 8 bits for subnets. Assuming your tunnel uses some other addresses from your provider, I would assign subnet 1 to your lan, and then use more as needed. Hence 2001:pppp:pppp:ppp1::/64 as your prefix.
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