Erik, I know how to configure off-link on a router. I was asking the community. At least the people we pinged in the past in the community didn't know how or didn't reply including Hesham.
How off-link is configured is described in section 2.1, and 2.2.1 of our draft. Your explanation below for the section 2.1 is fine. As for the off-link suggestion you make below for AdvOnLinkFlag=False, folks might not agree with you on just setting L-bit in RA to be clear and off-link is signaled. Here is one reason why. Snipped below is text from section 2.3 on our draft. [An on-link bit of clear indicates nothing regarding on-link determination. In section 6.3.4 of draft-ietf-ipv6-rfc2461bis-11 (Narten, T., Nordmark, E., Simpson, W., and H. Soliman, "Neighbor Discovery for IP Version 6 (IPv6)," March 2007.) [NDbis]": "...a Prefix Information Option with on-link flag set to zero conveys no information concerning on-link determination and MUST NOT be interpreted to mean that addresses covered by the prefix are off-link.... Prefixes with the on-link flag set to zero would normally have the autonomous flag set and be used by [ADDRCONF]."] Did we miss anything in the interpretation of the text above from RFC 4861. This text is not clear. Thanks. Hemant -----Original Message----- From: Erik Nordmark [mailto:[EMAIL PROTECTED] Sent: Wednesday, December 05, 2007 1:46 PM To: Hemant Singh (shemant) Cc: Suresh Krishnan; ipv6@ietf.org Subject: Re: Off-link and on-link Hemant Singh (shemant) wrote: > Good question, Erik. To the best of my knowledge such an RFC does not > exist - at least describing total details of an aggregation router - > like unicast, mcast, and anycast data forwarding rules etc. The > closest I have found in IETF is what IETF calls as multi-link router. FWIW I don't find "multi-link router" in any RFC. My point was that using this undefined term doesn't help clarify things. It would have been better to talk about a router which has been configured to never send any redirects. > Now the question I asked in my presentation. I have to configure this > aggregation router to signal off-link. How do I do that? By not to configuring it to enable the L flag for any prefix that the router advertized. Abstractly (per RFC 4861) this is done by setting AdvOnLinkFlag=False. If you have a question on how to do that for a particular product you should ask the vendor of that product. If you are using OpenSolaris I can help. > As I said in the presentation, let's forget the aggregation router. > The host implementation bug we found is reproduced in an Ethernet LAN > network too. An RA from the router was sent where RA was NOT signaling > on-link and the host still behaved as on-link for traffic forwarding. That is clearly a bug in the host implementation. Have you contacted the host vendor? > The RA we used was an RA that did not send any PIO (Prefix Information > Option). BTW, such a case (RA with no PIO) is not even covered by the > definition of on- and off-link in section 2.1 of RFC 4861, especially > since section 2.1 goes to so much copious details to describe on-link. It does cover it. If no information is know about an address (which is this case - no prefix options with L=1 and no redirects) then the host will send to a default router. Erik -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
