Re: [PATCH] IPv6: Fix Prefix Length of Link-local Addresses

On Thu, Oct 10, 2002 at 09:00:34AM +0900, Yuji Sekiya wrote:

At Wed, 09 Oct 2002 16:45:04 -0700 (PDT),
** David S. Miller [off-list ref] wrote:

quoted

   The reason we change the prefix length  from /10 to /64 is
   following spec and adapting other imprementations.

I think Derek's explanation shows that the specification
allows the /10 behavior.

Hmm... we interpret the spec as /64 prefix.

quoted

Also, I suspect that since Derek works for Cisco, some "other
implementations" behave how he describes. :-)

I have cisco box which installed IPv6 IOS.
But it defines no prefix length at an interface,

FastEthernet4/1 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::201:64FF:FEA3:ED55

and outgoing interface of routing table is NULL ? :-)

L   FE80::/10 [0/0]
     via ::, Null0, 7w0d

Turn on 'debug ipv6 nd',  'debug ipv6 icmp',  'debug ipv6 pack d'

Then do 'ping ipv6' specify a link local of say fe80:1910::10 and
an egress interface,  and watch what happens.

DF

At Thu, 10 Oct 2002 01:04:39 +0100,
Derek Fawcus [off-list ref] wrote:

Turn on 'debug ipv6 nd',  'debug ipv6 icmp',  'debug ipv6 pack d'

Then do 'ping ipv6' specify a link local of say fe80:1910::10 and
an egress interface,  and watch what happens.

OK.

Oct 10 09:09:15: ICMPv6-ND: DELETE -> INCMP: FE80:1910::10
Oct 10 09:09:15: ICMPv6-ND: Sending NS for FE80:1910::10 on FastEthernet4/1
Oct 10 09:09:15: IPV6: source FE80::201:64FF:FEA3:ED55 (local)
Oct 10 09:09:15:       dest FF02::1:FF00:10 (FastEthernet4/1)
Oct 10 09:09:15:       traffic class 224, flow 0x0, len 72+8, prot 58, hops 255, originating
Oct 10 09:09:15: IPv6: Sending on FastEthernet4/1
Oct 10 09:09:15: IPv6: Encapsulation failed

Encapsulation failed ... ??? :-)

-- Yuji Sekiya