I am an assigned INT directorate reviewer for this draft. These comments were written primarily for the benefit of the Internet Area Directors. Document editors and shepherds should treat these comments just like they would treat comments from any other IETF contributors and resolve them along with any other Last Call comments that have been received. For more details of the INT directorate, see . I believe this document is ready to publish almost as it is. One issue I found during my review lies in Sec. 8.4 where IPv4 loose source routing being discussed. To avoid unnecessary fragmentation, I am suggesting the following wording change: S/ If the length of the path (n) is greater than MAX_SRC_HOPS (Section 5), only the "key" routers in the path are kept... / If the length of the path (n) is greater than MAX_SRC_HOPS (Section 5), or the adding of source routing header exceeds the path MTU, only the "key" routers in the path are kept... Cheers, Zhen