Netopia 435 Reference Manual page 161

7-28 Netopia ISDN Router Reference Guide
Input filter
Setting
Enabled
Forward
Source IP
address
Source IP
address mask
Dest. IP
address
Dest. IP
address mask
Protocol type
Source port
comparison Compare
Source port ID
Dest. port
comparison
Dest. port ID
Basic Firewall blocks undesirable traffic originating from the WAN (in
most cases, the Internet), but passes all traffic originating from the
LAN. It follows the conservative "that which is not expressly permitted
is prohibited" approach: unless an incoming packet expressly
matches one of the constituent input filters, it will not be forwarded to
the LAN.
The five input filters and one output filter that make up Basic Firewall
are shown in the table below.
Input filter
1 2
Yes Yes
No No
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
TCP TCP
No No
Compare
0 0
Equal Equal
2000 6000
Input filter Input filter
3 4
Yes Yes
Yes Yes
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
ICMP TCP
No
N/A
Compare
N/A 0
Greater
N/A
Than
N/A 1023
Input filter Output
5 filter 1
Yes Yes
Yes Yes
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
0.0.0.0 0.0.0.0
UDP 0
No
N/A
Compare
0 N/A
Greater
N/A
Than
1023 N/A