See: https://support.isc.org/Ticket/Display.html?id=11062

Hi ISC team,

I have talked to Tomek on asking dhcp team to
review my patch on the changes in ISC dhcp code base
to support the work of relay source port draft. Obviously
we have not got the IANA code point yet, so the option
values used in the diff is just for temporary testing use.
We would appreciate if you can review and comment
on my patch, so in future days we can possibly
ask for submitting this feature in ISC dhcp.

A readme file is also enclosed.

Many thanks.
- Naiming

Naiming Shen (naiming) <naiming@cisco.com>
CC: Enke Chen <enkechen@cisco.com>