Alexey Eromenko wrote: > 1. Internet Protocol - Five Fields: > https://datatracker.ietf.org/doc/draft-eromenko-ipff/ Why haven't you eliminated IP options entirely? IPv4 is a live evidence that they are totally unnecessary (assuming fragmentation enabled). > 4. Internet Protocol - Five Fields: Link Address Resolution Algorithm > (ARP replacement) > https://datatracker.ietf.org/doc/draft-eromenko-ipff-lara/ I'm not sure how DHCP request can be sent from a host with no IP addresses. Maybe, the host has and uses a globally unique MAC address. > 5. Internet Protocol - Five Fields: Mobile TCP (Mobile IP replacement) > https://datatracker.ietf.org/doc/draft-eromenko-ipff-mops/ What if two mobile hosts are communicating, moves simultaneously and send "Migrate" messages to old (and, now invalid) addresses of their peers? Note that falling back to DNS updates means minutes of delay. Masataka Ohta