Hello, imagine we have 2 mail relay that need to communicate and both are dual stack. What happens if the ipv6 communication is down between both end ? does the sender will try the ipv4 after a delay ?
on servers, it can be used to link each services on separate IPv6. on a router and all devices, it can be useful in case of a prefix change where you can have a transition phase with devices with IPv6 in multiple prefix.
Thanks for your reply,My question was in a dual stack context. But lets be more concrete.Imagine an enterprise connected to 2 tiers1 providers and lets say one of them is for example "Cogent" who don't provide a complete IPv6 routing because of conf...
