> Lorenzo Colitti <mailto:[email protected]> > 25 February 2013 09:47 > On Mon, Feb 25, 2013 at 5:25 PM, Ray Hunter <[email protected] > <mailto:[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"? yes. Bigger concern is that the borders of Homenet seem fuzzy, but I've expressed that elsewhere. > > 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?
Thanks. That'd work (provided your draft updates/clarifies RFC2461 Section 8.2 to cover SADR so an ICMP redirect is not sent in this case, and provided BCP38 filters of RFC6204 requirement S-2 have been applied to the WAN interface, not the LAN). It would also seem to suggest that if CER1 and CER2 LAN interfaces are within the homenet boundary, that if the WAN link to CER2 failed, then CER2 would also learn a default route from CER1 (and vice versa), and any telephony traffic or management traffic generated by CER2 would also be sent to CER1 and ISP1 if it had a source address of ISP1? Suggesting ISP specific services and applications should only bind to source addresses native to their own ISP? <snip> _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
