re-modeled DUID as discussed in the mailing list. And it needs to further revise according to the mailing list.
I think DUID needs to be added to 'options', instead of being moved. 'DUID' under 'server/client' is an internal attribute and every server/client must have one. I think it is different from the 'DUID-option', which is optional.
I differentiate between 'max utilization ratio (threshold, rw)' and 'utilization ratio (uint16, ro)'. I think it is a way to define the comparison logic.
Further revised and modeled some options. But there still much to do.
Hi, Here are the mainly changes.