Squashed commits:
[469890b] Spelling of deprecated
[a80f1fb] update to latest design spec
[e6193cb] Remove warning message from call to sprintf()
[8d0d168] Updates to new IPv6 settings
[76b75ce] Add all the settings proposed by the IPv6 design document
Updates to new IPv6 settings
Remove warning message from call to sprintf()
update to latest design spec
Spelling of deprecated
remove T_IFV4 and T_IFV6 because can be the same as T_IF