Atlantis Land Mistral Lan Router ISDN - Manual (Page 22)

Caller ID: None Callback #: None
Auth Method: Either Compression: No
Encryption: No Idle Timeout: 300
Enable IP: Yes IP RIP: Disable
IP Address: Dynamic
Bridging: No
Filtering Commands
⊕add filter <1-8>
Description: This command adds or modifies the nth IP filter rule in the system
Packet Filtering allows each IP packet exiting a router interface to be examined for a match with a
configured set of rules. If all of the conditions in any rule do not match the contents of the packet, then
the packet is either forwarded or discarded, depending upon the filter default for that interface.
Otherwise, the exception action is taken, i.e., the packet is discarded or forwarded, the opposite of the
default action. The default action for an interface is set by the set filter default command described
below.
The total number of rules system-wide in this version of the firmware is limited to eight. Each of these
rules may be assigned to one specific interface.
The conditions that may be specified are:
Conditions Values
IP Protocol 1. Any Protocol
2. TCP
3. UDP
4. ICMP
5. IGMP
Source IP Address 1. Any value (wildcard)
2. Individual IP Address (xxx.xxx.xxx.xxx)
3. Range of consecutive IP Addresses
(xxx.xxx.xxx.xxx-yyy.yyy.yyy.yyy)
4. A Network of IP Addresses (and its associated subnet mask).
(xxx.xxx.xxx.xxx/mmm.mmm.mmm.mmm)
Destination IP Address 1. Any value (wildcard)
2. Individual IP Address (xxx.xxx.xxx.xxx)
3. Range of consecutive IP Addresses
(xxx.xxx.xxx.xxx-yyy.yyy.yyy.yyy)
4. A Network of IP Addresses (and its associated subnet mask).
(xxx.xxx.xxx.xxx/mmm.mmm.mmm.mmm)
Source TCP/UDP Port 1. Any value (wildcard)
2. A TCP or UDP Port Number
3. A consecutive range of TCP/UDP Port Numbers
Destination TCP/UDP Port 1. Any value (wildcard)
2. A TCP or UDP Port Number
3. A consecutive range of TCP/UDP Port Numbers
Filter is specified by a number.
Note: Incorrect or mistyped filtering entries may cause undesired or unpredictable
behavior. It is strongly recommended that this feature be used with the utmost care and