>>>>> "Brian" == Brian E Carpenter <[email protected]> writes: Brian> Aliases, as you describe them, sound like a hack. I'd like to Brian> hear from Microsoft (for example) whether their support of Brian> multiple IPv6 addresses per interface is a hack or genuine. I Brian> don't care about IPv4, but the IPv6 model is very clear. You Brian> can't read the ND spec and imagine the arrival of a new Brian> address resetting sessions that use other addresses.
On Linux and *BSD, (possibly including OSX, but I don't know, but I could do an experiment with my officemate), new addresses get added without an interface flap. Old addresses expire as they expire, no interface flap need occur. Linux does this all in the kernel, *BSD does it in rtsold. I can't speak of what happens with dhcpv6. The choice of which one to use for new connections essentially depends upon the metrics on the route to that destination. Typically, for off-link destinations, it's the default route that matters. Where I think we see interface flaps is as a result of DHCPv4. If we lose connectivity to the DHCPv4, then the dhclient-daemon will reset the interface and start again. With wifi, this is often more frequent. I have had IPv6 connections survive such events, but not always. -- Michael Richardson <[email protected]>, Sandelman Software Works
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