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[RRG] Re: Difference between translation in LISP vs. Six/One Router -- Re: [RRG] Six/One Router Design Clarifications



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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