On Mon, Feb 25, 2013 at 5:25 PM, Ray Hunter <[email protected]> wrote:
> Figure 2 of the architecture is the problematic one, where there are end > hosts that share the only connection between 2 CERs (from competing ISPs). > > The end hosts do not share the same information as the 2 routers > (the end hosts ignore routing, and the PIO sent by the 2 CERs are > non-overlapping, as they are configured by 2 independent ASs). > Maybe I don't understand the problem. You're talking about the figure in http://tools.ietf.org/html/draft-ietf-homenet-arch-07#section-3.2.2.2 , right? And your concern is: "what happens if H1 sends a packet with source address SA (assigned from ISP A) to CER2"? The answer is that at CER2, the packet will not match the default route to ISP B because the source address doesn't match. However, it matches the default route to ISP A announced by CER1. So CER2 forwards the packet to CER1, and CER1 sends it out to ISP A. Yes, it's an extra IP hop, but the packet gets to where it needs to go. No?
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