https://mailarchive.ietf.org/arch/msg/softwires/VTpWJFxGrRH-jKHpDFqAqOxng4Q/
https://mailarchive.ietf.org/arch/msg/softwires/8R3dgW2H4fnHODX0vmslUBZYSl4/
https://mailarchive.ietf.org/arch/msg/softwires/YADpn6cjQ3XZ9J3ygaYjM3P8nuE/
https://mailarchive.ietf.org/arch/msg/softwires/34OMFb-Z-48X6vqeIGZi6K-1_UM/
https://mailarchive.ietf.org/arch/msg/softwires/Sk6iFhaAnDTs0fb8BgPZK4y4-Dc/