Dear authors, I read this document and think it is really a good and useful work. The draft describes various problems that we may encounter when we desire to sunset the IPv4, also some corresponding solutions is available in the appendix.
Meanwhile, I've got some minor questions and comments about this document. Since I'm not pretty much familiar with the sunset4 area, please correct me if I got something wrong. Some detailed comments: 1. In section 3.1, PROBLEM 2. Are the "default routers" just the "relay agents" in DHCP? If so, it would be better to use "relay agents" instead of the "default routers". 2. In section 3.2, the last paragraph. The text says "using this option requires running an IPv4 DHCP server". However, I think we could run a DHCPv4 over DHCPv6 server (RFC7341) here to solve the problem. DHCPv4 over DHCPv6 aims to solve the problem that DHCPv4 messages cannot be transported in pure IPv6 networks. Thus there is no need to design another equivalent protocol of RFC2563 using DHCPv6 as described in the section A.1.2. 3. In section 6, PROBLEM 13. You mentioned DHCP here, do you mean DHCP should also have a similar mechanism? Best Regards Linhui
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