Справочное Руководство для Netopia 430 s
7-28
Netopia ISDN Router Reference Guide
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 conser vative “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 for warded to
the LAN.
most cases, the Internet), but passes all traffic originating from the
LAN. It follows the conser vative “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 for warded to
the LAN.
The five input filters and one output filter that make up Basic Firewall
are shown in the table below.
are shown in the table below.
Setting
Input filter
1
Input filter
2
Input filter
3
Input filter
4
Input filter
5
Output
filter 1
Enabled
Yes
Yes
Yes
Yes
Yes
Yes
For ward
No
No
Yes
Yes
Yes
Yes
Source IP
address
address
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
Source IP
address mask
address mask
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
Dest. IP
address
address
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
Dest. IP
address mask
address mask
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
0.0.0.0
Protocol type
TCP
TCP
ICMP
TCP
UDP
0
Source por t
comparison
comparison
No
Compare
No
Compare
N/A
No
Compare
No
Compare
N/A
Source por t ID
0
0
N/A
0
0
N/A
Dest. por t
comparison
comparison
Equal
Equal
N/A
Greater
Than
Greater
Than
N/A
Dest. por t ID
2000
6000
N/A
1023
1023
N/A