Unknown Command Response
Unknown Suboptions lists the commands to indicate reception of an unknown command. The proxy must send UNKNOWN-SUBOPTION-RCVD-2 any time it receives a command that it does not support.
255 250 232 2 code 255 240
A proxy response to indicate that it received an unknown suboption command from the virtual machine. code identifies the unknown suboption. The proxy must support this command.
255 250 232 3 code 255 240