OPTION_F_RAND
exp_passive_estab_in.flags = OPTION_F_RAND | OPTION_F_MAX_DELACK_MS;
exp_active_estab_in.flags = OPTION_F_RAND | OPTION_F_MAX_DELACK_MS;
exp_passive_estab_in.flags = OPTION_F_RAND | OPTION_F_MAX_DELACK_MS;
exp_active_estab_in.flags = OPTION_F_RAND | OPTION_F_MAX_DELACK_MS |
exp_passive_fin_in.flags = OPTION_F_RAND;
exp_active_fin_in.flags = OPTION_F_RAND;
exp_passive_estab_in.flags = OPTION_F_RAND | OPTION_F_MAX_DELACK_MS;
exp_active_estab_in.flags = OPTION_F_RAND | OPTION_F_MAX_DELACK_MS;