On 05/19/2013 04:31 PM, james woodyatt wrote: > I have a problem with the following set of requirements: > > The Net_Iface is a value that identifies the network interface for > which an IPv6 address is being generated. The following properties > are desirable for the Net_Iface: > > o it MUST be constant across system bootstrap sequences and other > network events (e.g., bringing another interface up or down) > > o it MUST be different for each network interface > > Some hosts have dynamic logical network interfaces (distinguishable > from physical interface), which are created every time the host joins > a network, and destroyed when the host separates from a previously > joined network. Examples are typically interfaces that involve > signaling systems, point-to-point connection semantics for the link > layer, e.g. virtual private networks, automatic tunnels, et cetera. > > According to these requirements, such hosts MUST NOT reuse previously > generated stable privacy addresses when joining the same network with > a new logical interface. That seems counter to the goal of this > standard.
I'm not sure I follow... The requirement is that you address changes when you move from one network to another. The only requirement for "Net_Iface" must be different for different network interface is that DAD failures are avoided (i.e., you don't have any two interfaces deterministically getting the same address). > I think hosts need some latitude in these requirements to allow for > temporally different network interfaces associated with the same > network service from the host's view to have the same identity for > the purpose of generating stable privacy addresses. If you use the interface index for Net_Iface, you'd probably get exactly this. Same thing if you use the interface name (these virtual interfaces are likely to get the same names when they are re-created?). Thanks! Best regards, -- Fernando Gont SI6 Networks e-mail: [email protected] PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
