User manual

G.shdsl Router User Manual 152
52
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
172.16.1.1:25192.168.3.4:1234
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
172.16.1.1:1357192.168.3.4:25
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
171.16.3.4:600010.1.2.3:5150
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