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Page 40 Creating a NAT Policy
4. Click on the Advanced tab.
• If you would like for the access rule to timeout after a
different period of TCP inactivity, set the amount of
time, in minutes, in the TCP Connection Inactivity
Timeout (minutes) field. The default value is 15
minutes.
• If you would like for the access rule to timeout after a
different period of UDP inactivity, set the amount of
time, in minutes, in the UDP Connection Inactivity
Timeout (minutes) field. The default value is 30
minutes.
• Specify the number of connections allowed as a
percent of maximum number of connections allowed
by the SonicWALL security appliance in the Number
of connections allowed (% of maximum
connections) field.
• Select Create a reflexive rule if you want to create a
matching access rule to this one in the opposite
direction--from your destination zone or address
object to your source zone or address object.
5. Click on the QoS tab if you want to apply DSCP or 802.1p
Quality of Service coloring/marking to traffic governed by
this rule. See the SonicOS Enhanced Administrator’s
Guide for more information on managing QoS marking in
access rules.
6. Click OK to add the rule.
Creating a NAT Policy
The Network Address Translation (NAT) engine in SonicOS
Enhanced allows users to define granular NAT policies for their
incoming and outgoing traffic. By default, the SonicWALL
security appliance has a preconfigured NAT policy to allow all
systems connected to the LAN interface to perform Many-to-
One NAT using the IP address of the WAN interface, and a
policy to not perform NAT when traffic crosses between the
other interfaces.
You can create multiple NAT policies on a SonicWALL running
SonicOS Enhanced for the same object – for instance, you can
specify that an internal server use one IP address when
accessing Telnet servers, and to use a totally different IP
address for all other protocols. Because the NAT engine in
SonicOS Enhanced supports inbound port forwarding, it is
possible to hide multiple internal servers off the WAN IP
address of the SonicWALL security appliance. The more
granular the NAT Policy, the more precedence it takes.