Re: [mif] What about changing [IPv6] default router rules a bit?

[Zhen Cao <caozhenpku at gmail.com>]

On Sat, Oct 17, 2009 at 4:04 PM, Markku Savela <msa at moth.iki.fi> wrote:
> I thought to repost my proposal from over 2 years ago on IPv6 mailing
> list (21.8.2007). I got no feedback then, but I think this might be
> relevant for the MIF topic. Maybe people now understand better what I
> was trying to get through..?
>
> -------
>
> It's not difficult to find even home users with multiple ISP
> links. Both ISP's send RA's with different prefixes (A=1).
>
> Host sees now two default routers on link and will have multiple
> global addresses. By current rules, host can use either router for
> outgoing packets regardless of the selected source address.

Not necessarily true. If the host implements the strong end system
model, it will choose the outgoing route regarding the selected source
address.

>
> I think it would be more sensible to pick the default router from the
> set of routers that actually advertised the prefix matching the
> selected source address?
>
> This would be a simple way to avoid hitting the filters of the ISP's,
> when wrong source address (for that ISP) is used.
>
> The IPv6 architecture assumes all routers on link "co-operate", but I
> think that is too much to expect from simple "home routers", the ISP
> would be supplying... it's better to put some intelligence into host
> requirements?
>
> --
> Markku Savela
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