Filter
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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