SMARTLINK
I&II
MDS921AE-10BTS - MDS
SMTP Server
172.16.1.1:25
Packet Direction
Source
3
Outbound
172.16.1.1
4
Inbound
192.168.3.4
SMTP Client
172.16.1.1:1357
Packet Direction
Source
5
Inbound
10.1.2.3
6
Outbound
171.16.3.4
6
171.16.3.4:6000
X11 Server
Update Filtering Rule
Index Protocol Direction Action
1
TCP
Inbound Permit
2
TCP
Outbound Permit
3
TCP
Outbound Permit
4
TCP
Inbound Permit
5
Any
Either
Deny
Filtering Result
Index Protocol Direction Action
1
TCP
Inbound Permit(A)
2
TCP
Outbound Permit(B)
3
TCP
Outbound Permit(C)
4
TCP
Inbound Permit(D)
5
TCP
Inbound Deny(E)
6
TCP
Outbound Deny(E)
S957AE-10BTS User Manual
Page 64 of 113
Internet
1
2
SMTP Client
192.168.3.4:1234
Firewall
Source
Destination
Protocol Dest. Port
172.16.1.1
192.168.3.4
TCP
25
192.168.3.4
172.16.1.1
TCP
1357
Internet
3
4
SMTP Server
192.168.3.4:25
Firewall
Source
Destination
Protocol Dest. Port
10.1.2.3
171.16.3.4
TCP
6000
171.16.3.4
10.1.2.3
TCP
5150
Internet
5
10.1.2.3:5150
Firewall
Action
Source
Destination
Source Port
Permit
External
Internal
>1023
Permit
Internal
External
25
Permit
Internal
External
>1023
Permit
External
Internal
25
Deny
Any
Any
Any
Action
Source
Destination
Source Port
Permit(A) 192.168.3.4
171.16.1.1
1234
Permit(B) 171.16.1.1
192.168.3.4 25
Permit(C) 171.16.1.1
192.168.3.4 1357
Permit(D) 192.168.3.4
171.16.1.1
25
Deny(E) 10.1.2.3
171.16.3.4
5150
Deny(E) 171.16.3.4
10.1.2.3
6000
SMTP Client
192.168.3.4:1234
Port Action (Rule)
Permit (C)
Permit (D)
SMTP Server
192.168.3.4:25
Dest. Port Action (Rule)
Deny (E)
Deny (E)
Attacker
10.1.2.3:5150
Source Port Dest. Port
25
>1023
25
>1023
Any
Source Port Dest. Port
25
1234
25
1357
6000
5150