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Network Settings - IP Settings



IP Settings Information
Description IP, hostname and DNS settings.
Package Name app-network / cc-network
Configuration Page Network > IP Settings > IP Settings

A configuration page for configuring your network cards, hostname and DNS servers.


Linux will auto-detect most PCI-based network cards. Older ISA cards may require setting parameters for the IRQ and IO. You may also need to disable plug-and-play features on the card. Please check Red Hat's Hardware Compatibility Lists to see what settings may be required for your brand of network card.

Network Roles

Ss set hotlan role.png

When configuring a network interface, the first thing you need to consider is the network role. Will this network card be used to connect to the Internet, for a local network, for a network with just server systems? The following network roles are supported in ClarkConnect and are described in further detail in the next sections:

  • External - network interface with direct or indirect access to the Internet
  • LAN - local area network
  • Hot LAN - local area network for untrusted systems
  • DMZ - de-militarized zone for a public network

  On a standalone system, your network card should be configured with an external role, not a LAN role  


The external role provides a connection to the Internet. On a ClarkConnect system configured as a gateway, the external role is for your Internet connection. On a ClarkConnect system configured in standalone mode, the external role is for connecting to your local area network.

With the Office and Enterprise Editions, you can have more than one external interface configured for load balancing and automatic failover. See the Multi-WAN section of the user guide for details.

Gateway Setting -- If you have a static IP address, it is important to make sure the gateway configuration setting is correct. If the gateway setting is missing or invalid, your system will be unable to reach the Internet. On most networks, the gateway IP address will be on the same network as your external IP address. For example, an external IP address of will typically have a gateway at or In some circumstances, the gateway will not be on the same network. You will see a warning message about this unusual gateway configuration.


The LAN (local area network) role provides network connectivity for your desktops, laptops and other network devices. LANs should be configured with an IP address range of 192.168.x.x or 10.x.x.x. For example, you can configure your ClarkConnect LAN interface with the following:

  • IP:
  • Netmask:

All systems on your LAN would have IP addresses in the range of to


Hot LAN (or "Hotspot Mode") allows you to create a separate LAN network for untrusted systems. Typically, a Hot LAN is used for:

  • Servers open to the Internet (web server, mail server)
  • Guest networks
  • Wireless networks

A Hot LAN is able to access the Internet, but is not able to access any systems on a LAN. As an example, a Hot LAN can be configured in an office meeting room used by non-employees. Users in the meeting room could access the Internet and each other, but not the LAN used by employees.

The firewall port forwarding page in the web-based administration is used to forward ports to both LANs and Hot LANs.

  Only one Hot LAN is permitted.  


In ClarkConnect, a DMZ interface is for managing a block of public Internet IP addresses. If you do not have a block of public IP addresses, then use the Hot LAN role. A typical DMZ setup looks like:

  • WAN: An IP addresses for connecting to the Internet
  • LAN: A private network on 192.168.x.x
  • DMZ: A block of Internet IPs (e.g from to

The web-based administration tool has a DMZ firewall configuration page to managed the DMZ network.

Virtual IPs

ClarkConnect supports virtual IPs. To add a virtual IP address, click on the link to configure a virtual IP address and add specify the IP Address and Netmask.

In version 3.x, the procedure is different. From the main configuration screen:

  • Click on Edit for the appropriate interface
  • Select a Role for the interface (if required)
  • Select the Virtual as the interface Type
  • Configure an IP address

You will also need to create advanced firewall rules if the virtual IP is on the Internet.

Configuration from the Console

You can access network configuration tools from the Administration Console tool. All other configuration is done remotely via a web browser -- the console is only used to change or configure your network information. The console can be accessed from a monitor and keyboard attached the server.

Ss console.png


  The two network cables coming from your box may need to be swapped. If you are having a hard time connecting to the Internet, make sure you try swapping the cables.  

In most installs, the network cards and IP settings will work straight out of the box. However, getting the network up the first time can be an exercise in frustration on some installs. Issues include;

  • Network cards that are not auto-detected
  • Invalid networks settings (username, password, default gateway)
  • Finicky cable/DSL modems that cache network card hardware information

Here are some helpful advanced tools and tips to diagnose a network issue. After booting the system, hit Alt-F2 to get to a login prompt. Login with your username root and your password. The following tools will show detailed diagnostic data on your network cards.

  • mii-tool displays link status and speed
  • ethtool eth0 displays links status, speed, and many other stats - not all cards support this tool
  • ifconfig eth0 displays IP settings on eth0

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