IPv6 router advertisement
Michael H. Warfield
mhw at WittsEnd.com
Wed May 6 22:33:06 UTC 2009
On Wed, 2009-05-06 at 15:00 -0500, Ted Lemon wrote:
> On May 6, 2009, at 2:34 PM, Mihai Moldovan wrote:
> >> Given the symptoms you're describing, my working theory is that
> >> Microsoft's autoconf implementation is synthesizing the default route
> >> using the source address of the RA message, and Linux is not.
> > Sorry for asking such a stupid question, but isn't this was RA is
> > actually meant to be used for? Or where does Linux get the router
> > address from?
>
> This is what I get for speculating without reading the RFC. Here's
> what RFC 4861 says:
>
> On receipt of a valid Router Advertisement, a host extracts the source
> address of the packet and does the following:
> - If the address is not already present in the host's Default Router
> List, and the advertisement's Router Lifetime is non- zero, create a
> new entry in the list, and initialize its invalidation timer value
> from the advertisement's Router Lifetime field.
> - If the address is already present in the host's Default Router List
> as a result of a previously received advertisement, reset its
> invalidation timer to the Router Lifetime value in the newly received
> advertisement.
> - If the address is already present in the host's Default Router List
> and the received Router Lifetime value is zero, immediately time-out
> the entry as specified in Section 6.3.5.
> So to me this means that the behavior you are seeing is wrong.
> What's the steady-state value of net.ipv6.conf.all.autoconf on your
> linux machine? Also, do you have any kind of firewall setup on your
> linux machine?
Also... What is the value of net.ipv6.conf.all.forwarding? If that is
set to 1, autoconf is automatically disabled.
> I'm running 2.6.29 right now, but I've run with earlier versions of
> the kernel on a /64 and not seen this problem.
Regards,
Mike
--
Michael H. Warfield (AI4NB) | (770) 985-6132 | mhw at WittsEnd.com
/\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/
NIC whois: MHW9 | An optimist believes we live in the best of all
PGP Key: 0xDF1DD471 | possible worlds. A pessimist is sure of it!
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