Netopia 430 S/T, Справочное руководство

Страница: 161 / 276

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.
The five input filters and one output filter that make up Basic Firewall
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
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
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
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
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 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
Equal Equal N/A
Greater
Than
Greater
Than
N/A
Dest. por t ID 2000 6000 N/A 1023 1023 N/A