G.shdsl Router User Manual
Packet Direction
Source
Destination
Protocol Dest. Port Action (Rule)
1 Inbound
192.168.3.4
172.16.1.1 TCP 25
Permit
(A)
2 Outbound
172.16.1.1 192.168.3.4 TCP 1234
Permit
(B)
Internet
1
2
SMTP Server
SMTP Client
172.16.1.1:25
192.168.3.4:1234
Firewall
Packet Direction
Source
Destination
Protocol Dest. Port Action (Rule)
3 Outbound
172.16.1.1 192.168.3.4 TCP 25
Permit
(C)
4 Inbound
192.168.3.4
172.16.1.1 TCP 1357 Permit
(D)
Internet
3
4
SMTP Client
SMTP Server
172.16.1.1:1357
192.168.3.4:25
Firewall
Packet Direction
Source
Destination
Protocol Dest. Port Action (Rule)
5 Inbound
10.1.2.3
171.16.3.4 TCP 6000 Deny
(E)
6 Outbound
171.16.3.4 10.1.2.3 TCP
5150
Deny
(E)
Internet
5
6
Attacker
171.16.3.4:6000
10.1.2.3:5150
Firewall
X11 Server
Update Filtering Rule
Index Protocol Direction Action Source
Destination Source Port Dest. Port
1 TCP Inbound
Permit
External Internal
>1023
25
2 TCP Outbound
Permit
Internal External
25
>1023
3 TCP Outbound
Permit
Internal External
>1023
25
4 TCP Inbound
Permit
External Internal
25
>1023
5
Any
Either
Deny
Any Any Any Any
Filtering Result
Index Protocol Direction Action Source
Destination
Source Port Dest. Port
1 TCP Inbound
Permit(A) 192.168.3.4 171.16.1.1 1234
25
2 TCP Outbound
Permit(B) 171.16.1.1 192.168.3.4
25
1234
3 TCP Outbound
Permit(C) 171.16.1.1 192.168.3.4
1357
25
4 TCP Inbound
Permit(D) 192.168.3.4
171.16.1.1
25
1357
5 TCP Inbound
Deny(E)
10.1.2.3 171.16.3.4
5150 6000
6 TCP Outbound
Deny(E) 171.16.3.4
10.1.2.3
6000
5150
49