Specifies the value to store in the Type of Service
(TOS) octet in the IPv4 header or in the Traffic
Class octet in the IPv6 header, respectively, of the
IP packet used to encapsulate the ping probe.
The octet to be set in the IP header contains the
Differentiated Services (DS) Field in the six most
significant bits.
This option can be used to determine what effect an
explicit DS Field setting has on a ping response.
Not all values are legal or meaningful. A value of 0
means that the function represented by this option is
not supported. DS Field usage is often not supported
by IP implementations, and not all values are supported.
Refer to RFC 2474 and RFC 3260 for guidance on usage of
this field.