7. Network

The Network section of the web interface contains these components for viewing and configuring network settings on the TrueNAS® system:

Each of these is described in more detail in this section.


When any network changes are made an animated icon appears in the upper-right web interface panel to show there are pending network changes. When the icon is clicked it prompts to review the recent network changes. Reviewing the network changes goes to Network ➞ Interfaces where the changes can be permanently applied or discarded.

When APPLY CHANGES is clicked the network changes are temporarily applied for 60 seconds by default. This value can be changed by entering a positive integer in the seconds field. This feature is nice because the network settings preview can automatically roll back any configuration errors that are accidentally saved.

If the network settings applied work as intended, click KEEP CHANGES. Otherwise, the changes can be discarded by clicking DISCARD CHANGES.

7.1. Global Configuration

Network ➞ Global Configuration, shown in Figure 7.1.1, is for general network settings that are not unique to any particular network interface.


Fig. 7.1.1 Global Network Configuration

Table 7.1.1 summarizes the settings on the Global Configuration tab. Hostname and Domain fields are pre-filled as shown in Figure 7.1.1, but can be changed to meet requirements of the local network.

Table 7.1.1 Global Configuration Settings
Setting Value Description
Hostname string Host name of first TrueNAS controller. Upper and lower case alphanumeric, ., and - characters are allowed.
Hostname (TrueNAS Controller 2) string Host name of second TrueNAS controller. Upper and lower case alphanumeric, ., and - characters are allowed.
Hostname (Virtual) string Virtual host name. When using a virtualhost, this is also used as the Kerberos principal name. Enter the fully qualified hostname plus the domain name. Upper and lower case alphanumeric, ., and - characters are allowed.
Domain string System domain name. The Hostname and Domain are also displayed under the iXsystems logo at the top left of the main screen.
Additional Domains string Additional space-delimited domains to search. Adding search domains can cause slow DNS lookups.
IPv4 Default Gateway IP address Typically not set. See this note about Gateways. If set, used instead of the default gateway provided by DHCP.
IPv6 Default Gateway IP address Typically not set. See this note about Gateways.
Nameserver 1 IP address Primary DNS server.
Nameserver 2 IP address Secondary DNS server.
Nameserver 3 IP address Tertiary DNS server.
HTTP Proxy string Enter the proxy information for the network in the format http://my.proxy.server:3128 or http://user:password@my.proxy.server:3128.
Enable netwait feature checkbox If enabled, network services do not start at boot until the interface is able to ping the addresses listed in the Netwait IP list.
Netwait IP list string Only appears when Enable netwait feature is set. Enter a space-delimited list of IP addresses to ping(8). Each address is tried until one is successful or the list is exhausted. Leave empty to use the default gateway.
Host name database string Used to add one entry per line which will be appended to /etc/hosts. Use the format IP_address space hostname where multiple hostnames can be used if separated by a space.

When using Active Directory, set the IP address of the realm DNS server in the Nameserver 1 field.

If the network does not have a DNS server, or NFS, SSH, or FTP users are receiving “reverse DNS” or timeout errors, add an entry for the IP address of the TrueNAS® system in the Host name database field.


In many cases, a TrueNAS® configuration does not include default gateway information as a way to make it more difficult for a remote attacker to communicate with the server. While this is a reasonable precaution, such a configuration does not restrict inbound traffic from sources within the local network. However, omitting a default gateway will prevent the TrueNAS® system from communicating with DNS servers, time servers, and mail servers that are located outside of the local network. In this case, it is recommended to add Static Routes to be able to reach external DNS, NTP, and mail servers which are configured with static IP addresses. When a gateway to the Internet is added, make sure the TrueNAS® system is protected by a properly configured firewall.

7.2. Interfaces

Network ➞ Interfaces shows all physical Network Interface Controllers (NICs) connected to the TrueNAS® system. These can be edited or new bridge, link aggregation, or Virtual LAN (VLAN) interfaces can be created and added to the interface list.

Be careful when configuring the network interface that controls the TrueNAS® web interface or web connectivity can be lost.

To configure a new network interface, go to Network ➞ Interfaces and click ADD.


Fig. 7.2.1 Adding a Network Interface

Each Type of configurable network interface changes the available options. Table 7.2.1 shows which settings are available with each interface type.

Table 7.2.1 Interface Configuration Options
Setting Value Type Description
Type drop-down menu All Choose the type of interface. Bridge creates a logical link between multiple networks. Link Aggregation combines multiple network connections into a single interface. A virtual LAN (VLAN) partitions and isolates a segment of the connection.
Name string All Enter a name to use for the the interface. Use the format laggX, vlanX, or bridgeX where X is a number representing a non-parent interface.
Description string All Notes or explanatory text about this interface.
DHCP checkbox All Enable DHCP to auto-assign an IPv4 address to this interface. Leave unset to create a static IPv4 or IPv6 configuration. Only one interface can be configured for DHCP.
Autoconfigure IPv6 drop-down menu All Automatically configure the IPv6 address with rtsol(8). Only one interface can be configured this way.
Disable Hardware Offloading checkbox All Turn off hardware offloading for network traffic processing. WARNING: disabling hardware offloading can reduce network performance and is only recommended when the interface is managing jails, plugins, or virtual machines (VMs).
Bridge Members drop-down menu Bridge Network interfaces to include in the bridge.
Lagg Protocol drop-down menu Link Aggregation Select the Protocol Type. LACP is the recommended protocol if the network switch is capable of active LACP. Failover is the default protocol choice and should only be used if the network switch does not support active LACP.
Lagg Interfaces drop-down menu Link Aggregation Select the interfaces to use in the aggregation. Warning: Lagg creation fails when the selected interfaces have manually assigned IP addresses.
Parent Interface drop-down menu VLAN Select the VLAN Parent Interface. Usually an Ethernet card connected to a switch port configured for the VLAN. A bridge cannot be selected as a parent interface. New Link Aggregations are not available until the system is restarted.
Vlan Tag integer VLAN The numeric tag provided by the switched network.
Priority Code Point drop-down menu VLAN Select the Class of Service. The available 802.1p Class of Service ranges from Best effort (default) to Network control (highest).
MTU integer All Maximum Transmission Unit, the largest protocol data unit that can be communicated. The largest workable MTU size varies with network interfaces and equipment. 1500 and 9000 are standard Ethernet MTU sizes. Leaving blank restores the field to the default value of 1500.
Options string All Additional parameters from ifconfig(8). Separate multiple parameters with a space. For example: mtu 9000 increases the MTU for interfaces which support jumbo frames. See this note about MTU and lagg interfaces.
IP Address integer and drop-down menu All Static IPv4 or IPv6 address and subnet mask. Example: and /24. Click ADD to add another IP address. Clicking DELETE removes that IP Address.

Multiple interfaces cannot be members of the same subnet. See Multiple network interfaces on a single subnet for more information. Check the subnet mask if an error is shown when setting the IP addresses on multiple interfaces.

Saving a new interface adds an entry to the list in Network ➞ Interfaces.

Expanding an entry in the list shows further details for that interface.

Editing an interface allows changing all the interface options except the interface Type and Name.


Interfaces cannot be edited or deleted when High Availability (HA) has been enabled.

7.2.1. Network Bridges

A network bridge allows multiple network interfaces to function as a single interface.

To create a bridge, go to Network ➞ Interfaces and click ADD. Choose Bridge as the Type and continue to configure the interface. See the Interface Configuration Options table for descriptions of each option.

Enter bridgeX for the Name, where X is a unique interface number. Open the Bridge Members drop-down menu and select each interface that will be part of the bridge. Click SAVE to add the new bridge to Network ➞ Interfaces and show options to confirm or revert the new network settings.

7.2.3. VLANs

TrueNAS® uses vlan(4) to demultiplex frames with IEEE 802.1q tags. This allows nodes on different VLANs to communicate through a layer 3 switch or router. A vlan interface must be assigned a parent interface and a numeric VLAN tag. A single parent can be assigned to multiple vlan interfaces provided they have different tags.


VLAN tagging is the only 802.1q feature that is implemented.

To add a new VLAN interface, go to Network ➞ Interfaces and click ADD. Choose VLAN as the Type and continue filling in the remaining fields. See the Interface Configuration Options table for descriptions of each option.

The parent interface of a VLAN must be up, but it can either have an IP address or be unconfigured, depending upon the requirements of the VLAN configuration. This makes it difficult for the web interface to do the right thing without trampling the configuration. To remedy this, add the VLAN interface, then select Network ➞ Interfaces, and click  (Options) and Edit for the parent interface. Enter up in the Options field and click SAVE. This brings up the parent interface. If an IP address is required, configure it using the rest of the options in the edit screen.


Creating a VLAN causes network connectivity to be interrupted and, if Failover is configured, a failover event. The web interface requires confirming the new network configuration before it is permanently applied to the TrueNAS® system.

7.3. IPMI

The TrueNAS® Storage Array provides a built-in out-of-band management port which can be used to provide side-band management should the system become unavailable through the graphical administrative interface. This allows for a few vital functions, such as checking the log, accessing the BIOS setup, and powering on the system without requiring physical access to the system. It can also be used to allow another person remote access to the system to assist with a configuration or troubleshooting issue.


Some IPMI implementations require updates to work with newer versions of Java. See PSA: Java 8 Update 131 breaks ASRock’s IPMI Virtual console for more information.

IPMI is configured from Network ➞ IPMI. The IPMI configuration screen, shown in Figure 7.3.1, provides a shortcut to the most basic IPMI configuration. Those already familiar with IPMI management tools can use them instead. Table 7.3.1 summarizes the options available when configuring IPMI with the TrueNAS® web interface.


Fig. 7.3.1 IPMI Configuration

Table 7.3.1 IPMI Options
Setting Value Description
TrueNAS Controller drop-down menu Select a TrueNAS controller. All IPMI changes are applied to that TrueNAS controller.
Channel drop-down menu Select the communications channel to use. Available channel numbers vary by hardware.
Password string Enter the password used to connect to the IPMI interface from a web browser. The maximum length accepted in the UI is 20 characters, but different hardware might require shorter passwords.
DHCP checkbox If left unset, IPv4 Address, IPv4 Netmask, and Ipv4 Default Gateway must be set.
IPv4 Address string IP address used to connect to the IPMI web interface.
IPv4 Netmask drop-down menu Subnet mask associated with the IP address.
IPv4 Default Gateway string Default gateway associated with the IP address.
VLAN ID string Enter the VLAN identifier if the IPMI out-of-band management interface is not on the same VLAN as management networking.
IDENTIFY LIGHT button Show a dialog to activate an IPMI identify light on the compatible connected hardware.

After configuration, the IPMI interface is accessed using a web browser and the IP address specified in the configuration. The management interface prompts for a username and the configured password. Refer to the IPMI device documentation to determine the default administrative username.

After logging in to the management interface, the default administrative username can be changed, and additional users created. The appearance of the IPMI utility and the functions that are available vary depending on the hardware.

7.4. Network Summary

Network ➞ Network Summary shows a quick summary of the addressing information of every configured interface. For each interface name, the configured IPv4 and IPv6 addresses, default routes, and DNS namerservers are displayed.

7.5. Static Routes

No static routes are defined on a default TrueNAS® system. If a static route is required to reach portions of the network, add the route by going to Network ➞ Static Routes, and clicking ADD. This is shown in Figure 7.5.1.


Fig. 7.5.1 Adding a Static Route

The available options are summarized in Table 7.5.1.

Table 7.5.1 Static Route Options
Setting Value Description
Destination integer Use the format A.B.C.D/E where E is the CIDR mask.
Gateway integer Enter the IP address of the gateway.
Description string Optional. Add any notes about the route.

Added static routes are shown in Network ➞ Static Routes. Click  (Options) on a route entry to access the Edit and Delete buttons.