On Tue, Jul 29, 2008 at 06:40:52PM +0100, Christian Vogt wrote: > David - > >> No, LISP translation does not require per-session >> state. I'm running one (www.translate.lis4.net), and it >> holds no per-session state. > > Then tell me how. > > Do you reserve a separate IPv4 locator per IPv4 EID? Well, in this case yes. In this case, that is what we decided to deploy, and to be practical, it does the job it was designed to do (and quite well, as you see). > And how does the LISP router decide whether an egress packet should be > tunneled or translated? Does it uphold the invariant described in > section 2.4.2 of the Six/One Router paper? So with this config: ip lisp translate inside 153.16.10.5 outside 128.223.157.65 If the packet comes from the outside and is destined for the "outside" address (128.223.157.65), the desination addresses is translated to the "inside" (153.16.10.5) address. If the packet comes from the inside and its source address is the "inside" address (153.16.10.5), the source address is translated to the "outside" address (128.223.157.65). Simple as that. Dave
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