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Re: Cannot get IPv6 router working



"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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