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# Network

## System DNS

The System DNS tab allows you to edit the DNS settings and to add DNS search domains.

To change DNS settings:

1. Click Administration > Setup > System Admin from the top-level menu bar.

2. Click Network in the System section.

3. In the System DNS tab, specify new values for the IP address of the primary and secondary DNS servers, or edit the list of search domains.

   To add a new domain, click the icon. To remove a domain, click the icon. To change the search order of domains, select a domain name, and click the up or down arrow until the domain is in the desired position.

4. Click Save.

5. Click Restart Network Service to put the changes into effect.

## Hosts

The Hosts tab allows direct editing of your system’s `/etc/hosts` file. You can specify data in the System Hosts text box or import it from a local file.

To change the Hosts information:

1. Click Setup > System Admin from the top-level menu bar.

2. Click Network in the System section, then click the Hosts tab.

3. In the System Hosts text box, specify hosts information (one host per line) in this format:

   `<IP Address> <hostname1> <hostname2> <hostname3>`

   When editing your `etc/hosts` file, ensure that the IP address specified each host is unique and not duplicated across hosts. A single IP address can be associated with multiple hostnames, but the same IP address may not be used for multiple hosts.

   To import information from a file, click Import from Local File, and locate the text file on the computer from which you are accessing your system.

4. Click Save.

## NICs

The NICs tab enables you to set the IP addresses for the network interface cards (NICs) on your system. Additionally, you can configure the hostname and default gateway for your system.

To set or change the NICs settings:

1. Click Setup > System Admin from the top-level menu bar.

2. Click Network in the System section.

3. In the NICs tab, specify the following settings. To edit the IP address , subnet mask, or speed/duplex of an NIC, select the NIC and click Edit above the NIC Name list.

   Setting | Description
   --- | ---
   Default Gateway | The IP address of the default gateway.
   Hostname | The network host name for this system. Make sure that your DNS can resolve the host name you specify to your system’s IP address . Performance is significantly affected if DNS cannot resolve the host name. This name must be identical to the domain specified in the Certificate Signing Request, described in Generating a Certificate Signing Request (CSR). Note: If you previously used a self-signed or CA-signed certificate on this system and are now changing its host name, you must regenerate a new self-signed certificate or CSR. Once obtained, the new certificate should be uploaded to ensure that the connectors which communicate with your system are able to validate the host name. For more information about generating a CSR, see Generating a Certificate Signing Request (CSR).
   Automatically route outbound packets (interface homing) | When this option is enabled (checked box), the response packets are sent back on the same system interface on which the request packets had arrived. Enabling this option can improve performance as the routing decisions do not need to be made (using the default gateway information and static routes) to send packets out from your system. If you have static routes configured, they are ignored when this feature is enabled. When this feature is disabled (unchecked box), the static routes (if configured) are used to determine the interface through which the response packets should leave your system. If you configure only one network interface, this setting does not provide any additional benefit.
   IP Address | The IP address for each network interface card (NICs) in your system. Add NIC Alias You can create an alias for any listed NIC. To do so: Highlight the NIC for which you want to create an alias. Click Add. Create an alternative IP address for the alias. Click Save. You can identify the alias from its original by an appended colon alongside a digit indicating the number of aliases you have created on a particular NIC. Notes: You cannot alter the speed of an IP alias. You can create as many aliases as you choose.
   Subnet Mask | The subnet mask associated with the IP address you entered for an NIC.
   Speed/Duplex | Select a speed and duplex mode, or let your system determine the network speed automatically: Auto (recommended) 10 Mbps - Half Duplex 10 Mbps - Full Duplex 100 Mbps - Half Duplex 100 Mbps - Full Duplex 1 Gbps - Full Duplex

4. Click Save.

5. Click Restart Network Service to put the changes into effect.

## Static Routes

You can specify static routes for the NICs on your system.

To add, edit, or delete a static route:

1. Click Setup > System Admin from the top-level menu bar.

2. Click Network in the System section.

3. In the Static Routes tab:

- To add a new static route, click Add.

- To edit or delete an existing route, select the route first, then click Edit or Delete.

  When adding or editing a static route, you need to configure these settings.

  Setting | Description
  --- | ---
  Type | Whether the static route is to a Network or a Host
  Destination | The IP address for the static route destination
  Subnet Mask | The subnet mask if you specify a network as the destination
  Gateway | The IP address of the gateway for the route

4. Click Save.

## Time/NTP

The Time/NTP tab enables you to configure system time, date, local timezone, and NTP servers. OpenText strongly recommends using an NTP server instead of manually configuring the time and date on your system.

To set or change the system time, date, or time zone manually:

Caution: If you manually set the date and time settings and are also using an NTP service, the date and time entered manually cannot be more than 16 minutes ahead of or behind the time that the NTP server is providing. If the manually entered time is more than 16 minutes different from the NTP server time, then the NTP service will fail to start.

1. Click Setup > System Admin from the top-level menu bar.

2. Click Network in the System section.

3. In the Time/NTP tab, configure these settings.

   Setting | Description
   --- | ---
   Current Time Zone | The time zones appropriate to your system’s location. To change this setting, click Change Time Zone... Local times zones follow the Daylight Saving Time (DST) rules for that area. Greenwich Mean Time (GMT) + and - time zones are DST agnostic. For example, the America/Los Angeles time zone varies by an hour compared with GMT when DST goes into and out of effect. Pacific Standard Time (PST) = GMT-8 Pacific Daylight Time (PDT) = GMT-7
   Current Time | The current date and time at the system’s location. To change this setting, click Change Date/Time... and then specify the current date and time.

4. The Time Zone change requires that you reboot the appliance. However, the Current Time change takes effect immediately.

To configure your system as an NTP server or for using an NTP server for your system:

1. Click Setup > System Admin from the top-level menu bar.

2. Click Network in the System section.

3. Click the Time/NTP tab.

4. Under NTP Servers, configure these settings.

   To add a new NTP server, click the icon. To remove a server, click the icon. To change the order in which the NTP servers should be used, select a server and click the up or down arrow until the NTP server is in the desired position.

   Setting | Description
   --- | ---
   Enable as an NTP server | Check this setting if this system should be used as an NTP server.
   NTP Servers | Specify the host name of an NTP server. For example, time.nist.gov. OpenText recommends using at least two NTP servers to ensure precise time on your system. To specify multiple NTP servers, type one server name per line. Notes: An ArcSight system can serve as an NTP server for any other ArcSight system. If System A serves as an NTP server for System B, System B needs to list System A in its NTP Servers list. Use the Test Servers button to verify the status of the servers entered into the NTP Servers box.

5. Click Save.

   Tip: You may need to scroll down to view the Save button and Restart NTP Service.

6. Click Restart NTP Service to put the changes into effect.