Answer | The SBG6580-2 also includes configurable options for the Local Area Network (LAN). Â The LAN IP Address and DHCP range can be configured and modified to suit the needs of the network. Â By default, the LAN IP address of the SBG6580-2 is 192.168.0.1. Â This document contains the following sections:
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NOTE 1: If the LAN IP address is modified to be in a different subnet (e.g. 192.168.8.1), the SBG6580-2 will automatically change the DHCP range to use addresses in that subnet.
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NOTE 2: The subnet mask of the SBG6580-2 (255.255.255.0) cannot be modified.
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LAN Subnet Setup
- Launch a Firefox or Safari browser.  Enter http://192.168.0.1 into the address box, and press the Enter key. Â
NOTE: A browser message on Chrome, Edge, Firefox, and Opera, may appear when accessing the Web Manager. The message includes 192.168.01 uses an unsupported protocol and ERR_SSL_VERSION_OR_CIPHER_MISMATCH. The Web Manager uses an earlier version of the TLS protocol and does not match the version allowed by the web browser.  Safari browsers on Apple PC and mobile devices are not impacted.  The workaround to access the Web Manager with a PC is to use the Firefox browser and set the TLS version to 1. For workaround instructions refer to article # 19435 - 192.168.0.1 uses an unsupported protocol.Â
 - A security or private risk alert may appear on the web browser advising users to proceed with caution when accessing the Web Manager. There is no risk in proceeding to the Web Manager. For instructions to bypass the alert screen, refer to article # 18181 - Alert Message for Web Manager Access.
 - On the Login page, enter admin or a customized username in the Username field.
 - Enter password or a customized password in the Password field.
NOTE: On later versions of the SBG6580-2, the Wi-Fi Security Key is used as the default admin password printed on the bottom white label. For assistance with Web Manager Access, refer to article # 18752 – SBG6580-2: Web Manager Access.
 - Click the Login button.  The Home page will appear.
 - Move the mouse cursor over Basic on the main menu, and click the DHCP link on the sub-menu.  The Basic - DHCP page will appear.
 - On the Basic - DHCP page, enter the desired IP address in the LAN IP Address field for the LAN interface here.  In this example, 192.168.8.1 is used.Â
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NOTE: The LAN IP address used must be a private IP address (within one of the following ranges):
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10.0.x.x - 10.254.x.x
172.16.x.x - 172.31.x.x
192.168.2.x - 192.168.254.x
 - Click the Apply button in the LAN Network Configuration section.
 - On the Warning pop-up window, click the Confirm button.
 - Next, the following message will appear (below).  Allow 3 minutes for the settings to take effect.
 - Launch a web browser, such as Internet Explorer, Firefox, or Safari.  Enter the new address into the address box, and press the Enter key.  The Login page will appear.  In this example the new address is http://192.168.8.1.
Configuring the DHCP settings
- Launch a Firefox or Safari browser.  Enter http://192.168.0.1 into the address box, and press the Enter key. Â
NOTE: A browser message on Chrome, Edge, Firefox, and Opera, may appear when accessing the Web Manager. The message includes 192.168.01 uses an unsupported protocol and ERR_SSL_VERSION_OR_CIPHER_MISMATCH. The Web Manager uses an earlier version of the TLS protocol and does not match the version allowed by the web browser.  Safari browsers on Apple PC and mobile devices are not impacted.  The workaround to access the Web Manager with a PC is to use the Firefox browser and set the TLS version to 1. For workaround instructions refer to article # 19435 - 192.168.0.1 uses an unsupported protocol.Â
 - A security or private risk alert may appear on the web browser advising users to proceed with caution when accessing the Web Manager. There is no risk in proceeding to the Web Manager. For instructions to bypass the alert screen, refer to article # 18181 - Alert Message for Web Manager Access.
 - On the Login page, enter admin or a customized username in the Username field.
 - Enter password or a customized password in the Password field.
NOTE: On later versions of the SBG6580-2, the Wi-Fi Security Key is used as the default admin password printed on the bottom white label. For assistance with Web Manager Access, refer to article # 18752 – SBG6580-2: Web Manager Access.
 - Click the Login button.  The Home page will appear.
 - Move the mouse cursor over Basic on the main menu, and click the DHCP link on the sub-menu.  The Basic - DHCP page will appear.
 - On the Basic - DHCP page, determine the best scenario for the Enabled DHCP Server option:
- If it is desired to have the SBG6580-2 assign IP addresses to the client devices, leave this setting checked.
- If some devices are manually configured with IP addresses, but others are to receive an address from the SBG6580-2, leave this setting checked.
- If there is another device on the network that will be the DHCP server, uncheck this setting.
- If it is desired to manually configure each device with an IP address, uncheck this setting.
- Enter the first IP address to be used in the DHCP range in the Starting Local Address field or leave it as default.
 - Enter the last IP address to be used in the DHCP range in the Ending Local Address field or leave it at default.
 - Enter the number of seconds that a device will keep an IP address in the Lease Time field, if that device has received an IP address automatically from the SBG6580-2 or leave it at default.
 - Click the Apply button.
 - On the Warning pop-up window, click the Confirm button.  The browser will refresh to the Basic - DHCP page.
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