NETGEAR UTM10EW-100NAS, UTM25-100NAS manual Features That Increase Traffic, Source MAC Filtering

ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual

–Web object blocking. You can block the following Web component types: embedded objects (ActiveX, Java, Flash), proxies, and cookies, and you can disable Java scripts. For more information, see “Configuring Web Content Filtering” on page 6-23.

–Setting the size of Web files to be scanned. Scanning large Web files requires network resources and might slow down traffic. You can specify the maximum file size that is scanned, and if files that exceed the maximum size are skipped (which might compromise security) or blocked. For more information, see “Configuring Web Malware Scans” on page 6-21.

For these features (with the exception of Web object blocking and setting the size of files to be scanned), you can set schedules to specify when Web content is filtered (see “Configuring Web Content Filtering” on page 6-23) and configure exceptions for groups (see “Setting Web Access Exception Rules” on page 6-41).

Source MAC Filtering

If you want to reduce outgoing traffic by preventing Internet access by certain PCs on the LAN, you can use the source MAC filtering feature to drop the traffic received from the PCs with the specified MAC addresses. By default, this feature is disabled; all traffic received from PCs with any MAC address is allowed. See “Enabling Source MAC Filtering” on page 5-40for the procedure on how to use this feature.

Features That Increase Traffic

The following features of the UTM tend to increase the traffic load on the WAN-side:

•LAN WAN inbound rules (also referred to as port forwarding)

•DMZ WAN inbound rules (also referred to as port forwarding)

•Port triggering

•Enabling the DMZ port

•Configuring Exposed hosts

•Configuring VPN tunnels

LAN WAN Inbound Rules and DMZ WAN Inbound Rules (Port Forwarding)

The LAN WAN Rules screen and the DMZ WAN Rules screen list all existing rules for inbound traffic (from WAN to LAN and from WAN to the DMZ). If you have not defined any rules, only the default rule is listed. The default rule blocks all access from outside except responses to requests from the LAN side. Any inbound rule that you create allows additional incoming traffic and therefore increases the traffic load on the WAN side.

Network and System Management 10-5

v1.0, September 2009