Hi Pete Please see my response inline.
[PM] I am the assigned Gen-ART reviewer for this draft. For background on Gen-ART, please see the FAQ at < http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>. Please wait for direction from your document shepherd or AD before posting a new version of the draft. Document: draft-ietf-roll-p2p-measurement-09 Reviewer: Pete McCann Review Date: 2012-02-05 IETF LC End Date: IESG Telechat date: 2012-02-07 Summary: Ready with nits Major issues: None Minor issues: Section 5: An Intermediate Point MUST discard the packet with no further processing if the received MO is not a Measurement Request (i.e., T = 0). It wasn't clear to me at first why the Intermediate Points are not supposed to see the Measurement Replies. I gather this is because the RPL control message used to send the reply uses a global or unique-local address instead of a link-local address. It may be worthwhile calling this out explicitly in Section 2 when you describe the two new RPL Control Messages. Really, the Replies do pass through Intermediate Points but they are not processed because they are not addressed to the Intermediate Point. Right? [MG] So there are two different questions really: Q1: Why the Intermediate Points are not supposed to see the Measurement Replies? Ans to Q1: The Measurement Reply is _unicast_ to the Start Point. So, the routers on the Measurement Reply's path treat it just as another data packet. The RPL code running on these routers never sees the Measurement Reply. So, if the RPL code on a router does see a Measurement Reply and this router is not listed as the Start Point inside the message, the router MUST discard the received message. Q2: Would the Measurement Reply pass through the Intermediate Points (at any layer)? Ans to Q2: Let's first be clear about what an Intermediate Point is. The Intermediate Points are the routers on the route being measured excluding the Start Point and the End Point. Now, Section 6.1 clearly identifies the situations where the Measurement Reply _may_ travel back to the Start Point using the reverse of the measured route. So, it is possible that the Measurement Reply travels along the reverse of the measured path and, in this case, the Measurement Reply does pass through all the Intermediate Points. However, the End Point may decide to send the Measurement Reply along a different route (different than the measured route). In that case, the Measurement Reply may not pass through the Intermediate Points. Hopefully this clarifies things. If you still think that the text needs to change, please let me know. [PM] Nits/editorial comments: Section 1: situations, where SHOULD BE: situations where Section 5.3: and the route accumulation in on SHOULD BE: and the route accumulation is on [MG] Thanks. I will make these changes in the final document. Thanks Mukul _______________________________________________ Gen-art mailing list [email protected] https://www.ietf.org/mailman/listinfo/gen-art
