Op 2 dec. 2011, om 23:03 heeft Brian E Carpenter het volgende geschreven: > Guillaume, > >> It checks the destination address and compares to all known routes >> (except the default route). If the destination address matches an >> entry, the packet is sent to the next hop and the algorithm ends. If >> not, the source address is checked and compared to the list of >> delegated prefixes. If a match is found in this list, the packet is >> sent to the associated next hop. If there is no match, the packet is >> dropped, considered as a trial of address spoofing. With this >> process, a packet whom destination is unknown, is routed to the ISP >> edge router which has delegated the source address prefix. > > How will this help with failover in multihomed sites? It guarantees > that the packet will be sent towards the failed path, I think.
The sdsa mechanism is very similar to what I propose with BRDP / BRDP-based routing (draft-boot-brdp-framework). This is how BRDP works: In a multi-homed-in-transit scenario, nodes learn new prefixes and may use these for new connections. The question is: how can the network take prefixes out of service, without loosing connections? This requires some configuration, e.g. remove prefix from router advertisement. In BRDP, I suggest making the nodes aware of the metric of the prefix. So hosts are guided to use the preferred prefix. The alternate prefix can be used for multi-path or happy eyeballs type of connections. If the transport can make use of the alternate prefix (like MPTCP), some packets are lost but the connection survives. Short lived connections (like DNS) should not have problems. Teco > Regards > Brian Carpenter > > P.S. draft-habault-gallet-homenet-sdsa doesn't seem to be on the > IETF server. > > On 2011-12-03 05:22, Guillaume Habault wrote: >> I've attached a draft made from some research that had been performed here >> to solve the ingress filtering issue in IPv6 multihomed network. That may >> be interesting for homenet WG. > _______________________________________________ > homenet mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/homenet _______________________________________________ homenet mailing list [email protected] https://www.ietf.org/mailman/listinfo/homenet
