G.shdsl Router User Manual 152
53
Rule Order
The rules order affects the filtering result. The filtering process will proceed from top to bottom,
changing the order as the different result of filtering.
Rule
Source Address
Destination Address
Action
A
10.0.0.0
172.16.6.0
Permit
B
10.1.99.0
172.16.0.0
Deny
C
Any
Any
Deny
Where
“
0
”
at the last eight bits indicates
“
from 1 to 254
”
,
“
0
”
at any eight bits preceding
“
0
”
,
“
0.0
”
or
“
0.0.0
”
indicates
“
from 1 to 254
”
. On the other hand,
“
0
”
and all
“
0
”
successive with
“
0
”
represents any.
When the rule is ordered as ABC.
Index
Source Address
Destination Address
Action
1
10.1.99.1
172.16.1.1
Deny (B)
2
10.1.99.1
172.16.6.1
Permit (A)
3
10.1.1.1
172.16.6.1
Permit (A)
4
10.1.1.1
172.16.1.1
Deny (C)
5
192.168.3.4
172.16.6.1
Deny (C)
The rule order will permit 10.1.99.1 to access 172.16.6.1.
When the rule is ordered as BAC.
Index
Source Address
Destination Address
Action
1
10.1.99.1
172.16.1.1
Deny (B)
2
10.1.99.1
172.16.6.1
Deny (B)
3
10.1.1.1
172.16.6.1
Permit (A)
4
10.1.1.1
172.16.1.1
Deny (C)
5
192.168.3.4
172.16.6.1
Deny (C)
The rule order will deny 10.1.99.1 to access 172.6.6.1.
