The read-only Interface Name field displays the name of the physical interface you selected.

Assign a virtual router to the interface, or click Virtual Router to define a new one (see Network > Virtual Routers). Select None to remove the current virtual router assignment from the interface.

Select Enable SD-WAN to enable SD-WAN functionality for the Ethernet interface.

Add and perform one of the following steps to specify a static IP address and network mask for the interface or AE interface.

You can enter multiple IP addresses for the interface. The forwarding information base (FIB) your system uses determines the maximum number of IP addresses.

Delete an IP address when you no longer need it.

Select Enable to activate the interface for Point-to-Point Protocol over Ethernet (PPPoE) termination. The interface is a PPPoE termination point to support connectivity in a Digital Subscriber Line (DSL) environment where there is a DSL modem but no other PPPoE device to terminate the connection.

Select an authentication method:

Enable the interface to act as a Dynamic Host Configuration Protocol (DHCP) client and receive a dynamically assigned IP address.

Enter a default route metric (priority level) for the route between the firewall and the DHCP server (range is 1 to 65,535; there is no default metric). A route with a lower number has higher priority during route selection. For example, a route with a metric of 10 is used before a route with a metric of 100.

Select to enable IPv6 addressing on the interface.

Add an IPv6 address and prefix length (for example, 2001:400:f00::1/64). Alternatively, select an existing IPv6 address object or create a new IPv6 address object.

Select to enable router advertisement (RA) for this IP address. (You must also enable the global Enable Router Advertisement option on the interface.) For details on RA, see Enable Router Advertisement in this table. The following fields apply only if you Enable Router Advertisement:

Select to allow the DHCPv6 Client to accept the RA from the DHCPv6 server.

Enable the IPv6 Address received for this DHCPv6 Client.

Enable Prefix Delegation to allow the firewall to support prefix delegation functionality. This means that the interface accepts a prefix from the upstream DHCPv6 server and places the prefix into the Prefix Pool you select, from which the firewall delegates a prefix to a host via RA. The ability to enable or disable prefix delegation for an interface allows the firewall to support multiple ISPs (one ISP per interface). Enabling prefix delegation on this interface controls which ISP provides the prefix.

Add a pool by entering a pool name (a maximum of 63 alphanumeric characters, hyphens, periods, and underscores).

Select the assignment type:

Select to enable duplicate address detection (DAD), then configure the other fields in this section.

To provide Neighbor Discovery on IPv6 interfaces, select and configure the other fields in this section. IPv6 DNS clients that receive the router advertisement (RA) messages use this information.

RA enables the firewall to act as a default gateway for IPv6 hosts that are not statically configured and to provide the host with an IPv6 prefix for address configuration. You can use a separate DHCPv6 server in conjunction with this feature to provide DNS and other settings to clients.

This is a global setting for the interface. If you want to set RA options for individual IP addresses, Add and configure an IPv6 address in the IP address table. If you set RA options for any IPv6 address, you must Enable Router Advertisement for the interface.

Specify the link maximum transmission unit (MTU) to apply to clients (range is 1,280 to 1,500) or default to unspecified, which maps to a system default.

Select to indicate to the client that addresses are available via DHCPv6.

DNS Support is available if you Enable Router Advertisement on the Router Advertisement tab.

Select for the firewall to send DNS information in NDP router advertisements from this IPv6 Ethernet interface. The other DNS Support fields (Server, Lifetime, Suffix, and Lifetime) are visible only after you select this option.

Add one or more domain names (suffixes) for the DNS search list (DNSSL). Maximum length is 255 bytes.

A DNS search list is a list of domain suffixes that a DNS client router appends (one at a time) to an unqualified domain name before it enters the name into a DNS query, thereby using a fully qualified domain name in the query. For example, if a DNS client tries to submit a DNS query for the name “quality” without a suffix, the router appends a period and the first DNS suffix from the DNS search list to the name and transmits the DNS query. If the first DNS suffix on the list is “company.com”, the resulting query from the router is for the fully qualified domain name “quality.company.com”.

If the DNS query fails, the router appends the second DNS suffix from the list to the unqualified name and transmits a new DNS query. The router uses the DNS suffixes until a DNS lookup is successful (ignores the remaining suffixes) or until the router has tried all of suffixes on the list.

Configure the firewall with the suffixes that you want to provide to the DNS client router in a Neighbor Discovery DNSSL option; the DNS client receiving the DNSSL option uses the suffixes in its unqualified DNS queries.

You can configure a maximum of 8 domain names (suffixes) for a DNS search list option that the firewall sends—in order listed from top to bottom—in an NDP router advertisement to the recipient, which uses them in the same order. Select a suffix and Move Up or Move Down to change the order or Delete a suffix when you no longer need it.

Enable and select:

If you choose Manual, Add the IPv6 address of a recursive DNS (RDNS) Server (for example, 2001:4860:4860:0:0:8888) for the firewall to send in NDP router advertisements from this IPv6 VLAN interface. RDNS servers send a series of DNS lookup requests to root DNS servers and authoritative DNS servers to ultimately provide an IP address to the DNS client.

You can configure a maximum of eight RDNS servers that the firewall sends— in the order listed from top to bottom—in an NDP router advertisement to the recipient, which then uses them in the same order. Select a server and Move Up or Move Down to change the order of the servers or Delete a server from the list when you no longer need it. Enter a Lifetime in seconds, which is the maximum length of time the client can use the specific RDNS server to resolve domain names. Range is 4 to 3,600; default is 1,200.

Enable and select:

If you choose Manual, Add and configure one or more Domain names (suffixes) for the DNS search list (DNSSL). The maximum suffix length is 255 bytes.

A DNS search list is a list of domain suffixes that a DNS client router appends (one at a time) to an unqualified domain name before it enters the name into a DNS query, thereby using a fully qualified domain name in the DNS query. For example, if a DNS client tries to submit a DNS query for the name “quality” without a suffix, the router appends a period and the first DNS suffix from the DNS search list to the name and then transmits the DNS query. If the first DNS suffix on the list is “company.com”, the resulting DNS query from the router is for the fully qualified domain name “quality.company.com”.

If the DNS query fails, the router appends the second DNS suffix from the list to the unqualified name and transmits a new DNS query. The router tries DNS suffixes until a DNS lookup is successful (ignores the remaining suffixes) or until the router has tried all of suffixes on the list.

Configure the firewall with the suffixes that you want to provide to the DNS client router in a Neighbor Discovery DNSSL option; the DNS client receiving the DNSSL option uses the suffixes in its unqualified DNS queries.

You can configure a maximum of eight domain names (suffixes) for a DNS search list that the firewall sends—in order listed from top to bottom—in an NDP router advertisement to the recipient, which uses those addresses in the same order. Delete a suffix from the list when you no longer need it.

If you selected Enable SD-WAN on the IPv4 tab, the firewall indicates SD-WAN Interface Status: Enabled. If you didn’t Enable SD-WAN, it indicates Disabled.

Select the interface speed in Mbps, or select auto to have the firewall automatically determine the speed.

Select the amount of allocated power in Watts if PoE is enabled.

Select a Management profile that defines the protocols (for example, SSH, Telnet, and HTTP) you can use to manage the firewall over this interface. Select None to remove the current profile assignment from the interface.

To add one or more static Address Resolution Protocol (ARP) entries, Add an IP address and its associated hardware [media access control (MAC)] address. To delete an entry, select the entry and click Delete. Static ARP entries reduce ARP processing.

To provide neighbor information for Neighbor Discovery Protocol (NDP), Add the IPv6 address and MAC address of the neighbor.

Enable Neighbor Discovery Protocol (NDP) proxy for the interface. The firewall will respond to ND packets requesting MAC addresses for IPv6 addresses in this list. In the ND response, the firewall sends its own MAC address for the interface so that the firewall will receive the packets meant for the addresses in the list.

It is recommended that you enable NDP proxy if you are using Network Prefix Translation IPv6 (NPTv6).

If you selected Enable NDP Proxy, you can filter numerous Address entries by entering a filter and clicking Apply Filter (gray arrow).

Enable Link Layer Discovery Protocol (LLDP) for the interface. LLDP functions at the link layer to discover neighboring devices and their capabilities by sending and receiving LLDP data units to and from neighbors.

Select Settings to make the DDNS fields available to configure.

Select the DDNS vendor (and version) that provides DDNS service to this interface:

The Name and Value fields that follow the vendor name are vendor-specific. The read-only fields notify you of parameters that the firewall uses to connect to the DDNS service. Configure the other fields, such as a password that the DDNS service provides to you and a timeout that the firewall uses if it doesn’t receive a response from the DDNS server.