Netopia Router PN Series User Manual
Page 168
7-26
Reference Guide
Basic Firewall’s filters play the following roles.
Input filters 1 and 2: These block WAN-originated OpenWindows and
X-Windows sessions. Service origination requests for these protocols
use ports 2000 and 6000, respectively. Since these are greater than
1023, OpenWindows and X-Windows traffic would otherwise be
allowed by input filter 4. Input filters 1 and 2 must precede input filter
4; otherwise they would have no effect as filter 4 would have already
passed OpenWindows and X-Windows traffic.
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
Forward
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 port
comparison
No
Compare
No
Compare
N/A
No
Compare
No
Compare
N/A
Source port ID
0
0
N/A
0
0
N/A
Dest. port
comparison
Equal
Equal
N/A
Greater
Than
Greater
Than
N/A
Dest. port ID
2000
6000
N/A
1023
1023
N/A