DSL Card Configuration
6-14 8000-A2-GB20-20
November 1997

Table 6-5. IP Router Options (3 of 4)

IP Router Filters (IP Filter Configuration) A-E-C
Gives the user the ability to build name sets of filter rules. A filter is a rule (or set of
rules) that is applied to a specific interface to indicate whether a packet can be
forwarded or discarded. You can add, edit, or delete router filter rules within a named
set.
A filter works by successively applying the rules to the information obtained from the
packet header until a match is found. The filter then performs the action specified by the
rule on that packet, which can be forwarded, discarded, or both.
Rules apply to the source and destination ports going to the end-user system. You may
have up to 33 rules per filter, but the greater number of rules, the lesser the
performance of the router filter.
On the DSL card, a maximum of 8 filters can be configured.
For additional information on IP Router filters, see Chapter 7,

IP Filtering

, of the

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Action – Add/Delete/Edit.
Filter Name – Up to 16 characters (optional).
Default Filter Action – Discard (Packet)/Forward (Packet).
Rule # – Up to 33 rules can be configured for each filter. This number is automatically
assigned.
# of Rules – Number of rules that apply to this port.
Source Address –
nnn.nnn.nnn.nnn
format. This field is read only for dynamic filers.
Source Address Mask –
nnn.nnn.nnn.nnn
format. If you specify a source subnet mask
of 0.0.0.0, the system skips the source address comparison. This field is read only for
dynamic filters.
Source Port No – 0–65536 (Default = 0). If the source port number is 0, the system
filters ICMP packets in addition to the packet types defined in the rule. This field is read
only for dynamic filters.
Comparison Type – Ignore – Do not do a comparison. To do a comparison on the port
number specified in the packet and the rule, specify one of the following: EQ – Equal to,
NEQ – Not Equal To, GT – Greater than, LT – Less than, In_Range – Within the
specified range, Out_Range – Outside of the specified range. This field is read only for
dynamic filters.
Destination Address –
nnn.nnn.nnn.nnn
format. This field is read only for dynamic
filters.
Destination Address Mask –
nnn.nnn.nnn.nnn
format. If you specify a destination
subnet mask of 0.0.0.0, the system skips the destination address comparison. This field
is read only for dynamic filters.
Destination Port No. – 0–65536 (Default = 0). If the source port number is 0, the
system filters ICMP packets in addition to the packet types defined in the rule. This field
is read only for dynamic filters.
Comparison Type – Ignore – Ignore ports, EQ – Equal to, NEQ – Not Equal To,
GT – Greater than, LT – Less than, In_Range – Maximum source port,
Out_Range – Minimum source port. This field is read only for dynamic filters.
Filter Action – Discard (Packet)/Forward (Packet). This field is read only for dynamic
filters.
Rule Type – Static/Dynamic (Default = Static). This field is read only for dynamic filters.
Delete Rule – Yes/No.
Go to Next Rule – Yes/No.