Netgear UTM25-100NAS User Manual

10-2

Network and System Management

Using the dual WAN ports in load balancing mode increases the bandwidth capacity of the WAN 
side of the UTM, but there is no backup in case one of the WAN ports fail. When such as failure 
occurs, the traffic that would have been sent on the failed WAN port is diverted to the WAN port 
that is still working, thus increasing its load. However, there is one exception: traffic that is bound 
by protocol to the WAN port that failed is not diverted.

You can adjust the following features of the UTM in such a way that the traffic load on the WAN 
side decreases:

•

LAN WAN outbound rules (also referred to as service blocking)

•

DMZ WAN outbound rules (also referred to as service blocking)

•

Content filtering

•

Source MAC filtering

You can control specific outbound traffic (from LAN to WAN and from the DMZ to WAN). The 
LAN WAN Rules screen and the DMZ WAN Rules screen list all existing rules for outbound 
traffic. If you have not defined any rules, only the default rule is listed. The default rule allows all 
outgoing traffic. Any outbound rule that you create restricts outgoing traffic and therefore 
decreases the traffic load on the WAN side.

Each rule lets you specify the desired action for the connections that re covered by the rule:

•

BLOCK  always 

•

BLOCK by schedule, otherwise allow 

•

ALLOW always 

•

ALLOW by schedule, otherwise block 

The section below summarizes the various criteria that you can apply to outbound rules in order to 
reduce traffic. For more information about outbound rules, see 

. For detailed procedures on how to configure outbound rules, see 

 and 

Warning: This feature is for advanced administrators only! Incorrect configuration 

might cause serious problems.