Re:Why you need IPv6
by AstralStorm on Thursday May 24, 2018 @03:37AM
(#17141859)
What. If your ISP is not terrible, it just takes a route advertisement to switch the same IP address between networks. And route the same subnet through multiple networks.
There is no need for OSPF, RA is good enough. The ISP just has to not filter them out and forward into routing.
(You will have to inform them that you use a specific separate subnet on your network. This means typically a business contract.)
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Not all ISPs offer this functionality. I can’t realistically tell the customers I manage that we can’t support their preferred provider because of this, when they rightly point out that it just works on IPv4 without need for multi-homing.
And again, multi-homing does not address load balancing / policy based routing with active active links. Eg it’s possible to have 2 Ethernet connections, 1 VDSL connection and a LTE link. Can multi-homing IPv6 work in such a situation while providing fast failover and load balancing by service/application/policy?