Getting Started
Factor y Defa ult Set ting s
Cisco ISA500 Series Integrated Security Appliances Administration Guide 30
1
Factory Default Settings
The security appliance is preconfigured with settings to allow you to start using
the device with minimal changes. Depending on the requirements of your Internet
Service Provider (ISP) and the needs of your business, you may need to modify
some of these settings. You can use the Configuration Utility to customize all
settings, as needed.
This section includes the following topics:
•Default Settings of Key Features, page 30
•Restoring the Factory Default Settings, page 31

Default Settings of Key Features

The default settings of key features are described below. For a full list of all factory
default settings, see Factory Default Settings, page 461.
•IP Routing Mode: By default, only the IPv4 mode is enabled. To support
IPv4 and IPv6 addressing, enable the IPv4/IPv6 mode. See Configuring IPv4
or IPv6 Routing, page116.
•WAN Configuration: By default, the security appliance is configured to
obtain an IP address from your ISP using Dynamic Host Configuration
Protocol (DHCP). Depending on the requirement of your ISP, configure the
network addressing mode for the primary WAN. You can change other WAN
settings as well. See Configuring WAN Settings for Your Internet
Connection, page122.
•LAN Configuration: By default, the LAN of the security appliance is
configured in the 192.168.75.0 subnet and the LAN IP address is
192.168.75.1. The security appliance acts as a DHCP server to the hosts on
the LAN network. It can automatically assign IP addresses and DNS ser ver
addresses to the PCs and other devices on the LAN. For most deployment
scenarios, the default DHCP and TCP/IP settings should be satisfactory.
However, you can change the subnet address or the default IP address. See
Configuring a VLAN, page137.
•VLAN Configuration: The security appliance predefines a native VLAN
(DEFAULT) and a guest VLAN (GUEST). You can customize the predefined
VLANs or create new VLANs for your specific business needs. See
Configuring a VLAN, page137.