`enable`: `<boolean>` ::

Enable host firewall rules.

`log_level_in`: `<alert | crit | debug | emerg | err | info | nolog | notice | warning>` ::

Log level for incoming traffic.

`log_level_out`: `<alert | crit | debug | emerg | err | info | nolog | notice | warning>` ::

Log level for outgoing traffic.

`log_nf_conntrack`: `<boolean>` ('default =' `0`)::

Enable logging of conntrack information.

`ndp`: `<boolean>` ('default =' `0`)::

Enable NDP (Neighbor Discovery Protocol).

`nf_conntrack_allow_invalid`: `<boolean>` ('default =' `0`)::

Allow invalid packets on connection tracking.

`nf_conntrack_max`: `<integer> (32768 - N)` ('default =' `262144`)::

Maximum number of tracked connections.

`nf_conntrack_tcp_timeout_established`: `<integer> (7875 - N)` ('default =' `432000`)::

Conntrack established timeout.

`nf_conntrack_tcp_timeout_syn_recv`: `<integer> (30 - 60)` ('default =' `60`)::

Conntrack syn recv timeout.

`nosmurfs`: `<boolean>` ::

Enable SMURFS filter.

`protection_synflood`: `<boolean>` ('default =' `0`)::

Enable synflood protection

`protection_synflood_burst`: `<integer>` ('default =' `1000`)::

Synflood protection rate burst by ip src.

`protection_synflood_rate`: `<integer>` ('default =' `200`)::

Synflood protection rate syn/sec by ip src.

`smurf_log_level`: `<alert | crit | debug | emerg | err | info | nolog | notice | warning>` ::

Log level for SMURFS filter.

`tcp_flags_log_level`: `<alert | crit | debug | emerg | err | info | nolog | notice | warning>` ::

Log level for illegal tcp flags filter.

`tcpflags`: `<boolean>` ('default =' `0`)::

Filter illegal combinations of TCP flags.