Processing IPv6 Router Advertisements

[Fernando Gont]

Hello, Jinmei,

> Your understanding of what's happening is correct, and it's an 
> intentional behavior.  The relevant part of the source code is the 
> following snippet of: 
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet6/ip6_input.c?rev=1.81.2.4;content-type=text/plain

Thanks so much for this pointer (and for pointing the specific section
in your book that explains this in detail).



> 2.5.6.  Link-Local IPv6 Unicast Addresses
> 
> Link-Local addresses are for use on a single link.  Link-Local 
> addresses have the following format:
> 
> |   10     | |  bits    |         54 bits         |          64 bits
> | +----------+-------------------------+----------------------------+
>  |1111111010|           0             |       interface ID         | 
> +----------+-------------------------+----------------------------+
> 
> The "real" reason is described thoroughly in a book I coauthored.  I 
> believe you told me you had a copy of it, and assuming I'm correct, 
> see Section 2.9.3:-)

Yes, I do. Both Volume I and Volume II. :-)


> I admit this behavior is suboptimal for the spirit of "be liberal in 
> what you accept", but, as you probably know, it shouldn't cause any 
> interoperability trouble in practice.

Agreed.

Thanks again!

Kind regards,
-- 
Fernando Gont
e-mail: fernando at gont.com.ar || fgont at acm.org
PGP Fingerprint: 7809 84F5 322E 45C7 F1C9 3945 96EE A9EF D076 FFF1