| -v
| IP version of the filter rule. Valid values are 4 and
6.
|
| -n
| Filter rule ID. The new rule will be added BEFORE the filter rule
you specify. For IP version 4, the ID must be greater than 1 because
the first filter rule is a system generated rule and cannot be moved.
If this flag is not used, the new rule will be added to the end of the filter
rule table.
|
| -a
| Action. The value of Deny (D) will block traffic, and
the value of Permit (P) will allow traffic. The default
is D.
|
| -s
| Source address. It can be an IP address or a host name. If
a host name is specified, the first IP address returned by the name server for
that host will be used. This value along with the source subnet mask
will be compared against the source address of the IP packets.
|
| -m
| Source subnet mask: This will be used in the comparison of the IP
packet's source address with the source address of the filter
rule.
|
| -d
| Destination address. It can be an IP address or a host
name. If a host name is specified, the first IP address returned by the
name server for that host will be used. This value along with the
destination subnet mask will be compared against the destination address of
the IP packets.
|
| -M
| Destination subnet mask: This will be used in the comparison of the
IP packet's destination address with the destination address of the
filter rule.
|
| -g
| Apply to source routing? Must be specified as Y (yes) or
N (No). If Y is specified, this filter rule can
apply to IP packets that use source routing. The default value is yes
(Y). This field only applies to permit rules.
|
| -c
| Protocol. The valid values are: udp,
icmp, icmpv6, tcp, tcp/ack,
ospf, ipip, esp, ah, and
all. Value all indicates that the filter rule
will apply to all the protocols. The protocol can also be specified
numerically (between 1 and 252). The default value is
all.
|
| -o
| Source port or ICMP type operation. This is the operation that
will be used in the comparison between the source port/ICMP type of the packet
with the source port or ICMP type(-p flag) specified in this filter
rule. The valid values are: lt, le,
gt, ge, eq, neq, and
any. The default value is any. This value
must be any when the -c flag is ospf.
|
| -p
| Source port or ICMP type. This is the value/type that will be
compared to the source port (or ICMP type) of the IP packet.
|
| -O
| Destination port or ICMP code operation. This is the operation
that will be used in the comparison between the destination port/ICMP code of
the packet with the destination port or ICMP code (-P flag).
The valid values are: lt, le, gt,
ge, eq, neq, and any. The
default value is any. This value must be any when
the -c flag is ospf.
|
| -P
| Destination port/ICMP code. This is the value/code that will be
compared to the destination port (or ICMP code) of the IP packet.
|
| -r
| Routing. This specifies whether the rule will apply to forwarded
packets (R), packets destined or originated from the local host
(L), or both (B). The default value is
B.
|
| -w
| Direction. This specifies whether the rule will apply to incoming
packets (I), outgoing packets (O), or both
(B). The default value is B.
|
| -l
| Log control. Must be specified as Y(yes) or
N (No). If specified as Y, packets that match
this filter rule will be included in the filter log. The default value
is N (no).
|
| -f
| Fragmentation control. This flag specifies that this rule will
apply to either all packets (Y), fragment headers and unfragmented
packets only (H), fragments and fragment headers only
(O), or unfragmented packets only (N). The
default value is Y.
|
| -t
| ID of the tunnel related to this filter rule. All the packets that
match this filter rule must go through the specified tunnel. If this
flag is not specified, this rule will only apply to non-tunnel traffic.
|
| -i
| The name of IP interface(s) to which the filter rule applies. The
examples of the name are: all, tr0,
en0, lo0, and pp0. The default value
is all.
|