Avocent Cyclades-PR4000 installation manual Output for IP Filtering Example, Interior Router

Cyclades-PR4000

Filter_list Name exterior_out
Rule 0
Status		Enabled
Scope		Permit
Protocol		TCP
Source IP Operator		Equal
Source IP start		192.168.0.3
Source IP Mask		255.255.255.255
Destination IP	Operator	None
Source Port Operator		Equal
Source Port Start		SMTP
Destination Port	Operator	Greater than
Destination Port Start		1023
TCP connections allowed		N
Account Process allowed		N

FIGURE 12.4 OUTPUT FOR IP FILTERING EXAMPLE

Interior Router

If an interior router exists in the network, the administrator may decide to use a Default Scope of Permit. In this case, all undesired traffic must be excluded by a rule in the rule list. In Figure 12.5, a conceptual equivalent of the interface is shown.

All packets except those which fall into the holes in the ball will be allowed entry in to or out of the network.

Chapter 14 - Filters and Rules 129