Subject: [v6ops] draft-vandevelde-v6ops-pref-ps and interface selection based on IPv4/IPv6 preferences?

From: <[email-masked]>
Date: Mon, 15 Nov 2010 10:46:28 +0100

Hi,

Have you considered following scenario in the draft-vandevelde-v6ops-pref-ps work:

-          A host  has high preferred but IPv4-only interface up

-          A host has low preferred but IPv6-enabled interface up

-          Maybe both have as low latency, but different throughput and cost (for some party and some aspect (e.g. $ per byte, power))

-          Host is contacting to dual-stack server reachable via both interfaces

Here it might be preferred that such multi-interfaced host would actually use high preferred IPv4 interface rather than low preferred IPv6 interface. Hence in overall IPv4 should be preferred over IPv6, in such an setup (with exceptions of course).

The problem would be that with existing "prefer IPv6 over IPv4" rule a suboptimal interface selection would be done. There should be some means to prefer IPv4 instead, in such an setup.

Best regards,

Teemu