tech-net archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

Re: Cannot get IPv6 router working

On Jul 1, 2009, at 7:51 AM, Greg Troxel wrote:

"Steven M. Bellovin" <> 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

/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

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.

Yup, I discovered that about 10 minutes ago with the help of Linux -- its radvd gave a warning message about that, which I don't think that rtadvd does.

Home | Main Index | Thread Index | Old Index