Use the specified IP address (which must be given in
numeric form, not as a hostname) as the source address
in outgoing probe packets. On hosts with more than one
IP address, this option can be used to select the address
to be used. If the IP address is not one of this
machine's interface addresses, an error is returned and
nothing is sent. A zero-length octet string value for
this object disables source address specification.
The address type (InetAddressType) that relates to
this object is specified by the corresponding value
of pingCtlSourceAddressType.