responsibility to chose a valid bit combination. For details, read the L<ip(7)>
and L<ipv6(7)> manual pages, as well as I<RFCE<nbsp>2474>.
+=item B<PING_OPT_MARK>
+
+Mark (as in netfilter) outgoing packets using the SO_MARK socket option. Takes
+an int* pointer as a value. Setting this requires CAP_NET_ADMIN under Linux.
+Fails with C<operation not supported> on platforms which don't have SO_MARK.
+
=back
The I<val> argument is a pointer to the new value. It must not be NULL. It is