+.It Dv IPV6_TCLASS Fa "int *"
+Get or set the value of the traffic class field used for outgoing
+datagrams on this socket. The value must be between -1 and 255.
+A value of -1 resets to the default value.
+.It Dv IPV6_RECVTCLASS Fa "int *"
+Get or set the status of whether the traffic class header field
+will be provided as ancillary data along with the payload in subsequent
+.Xr recvmsg 2
+calls. The header field is stored as a single value of type int.