PA-7000 Series Layer 3 Interface
- Network > Interfaces > Ethernet
To configure a Layer 3 interface, select an interface (ethernet1/1, for example) and specify the following information.
Layer 3 Interface Settings
The interface name is predefined and you cannot change it.
Enter an optional description for the interface.
If you want to export unidirectional IP traffic that traverses an ingress interface to a NetFlow server, select the server profile or click Netflow Profile to define a new profile (see Device > Server Profiles > NetFlow). Select None to remove the current NetFlow server assignment from the interface.
Select a virtual router, 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.
If the firewall supports multiple virtual systems and that capability is enabled, select a virtual system (vsys) for the interface or click Virtual System to define a new vsys.
Select a security zone for the interface or click Zone to define a new zone. Select None to remove the current zone assignment from the interface.
Select the interface speed in Mbps (10, 100, or 1000) or select auto.
Select whether the interface transmission mode is full-duplex (full), half-duplex (half), or negotiated automatically (auto).
Select whether the interface status is enabled (up), disabled (down), or determined automatically (auto).
Ethernet InterfaceAdvancedOther Info
Select a 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.
Enter the maximum transmission unit (MTU) in bytes for packets sent on this interface (576 to 9,192; default is 1,500). If machines on either side of the firewall perform Path MTU Discovery (PMTUD) and the interface receives a packet exceeding the MTU, the firewall returns an ICMP fragmentation needed message to the source indicating the packet is too large.
Adjust TCP MSS
Select to adjust the maximum segment size (MSS) to accommodate bytes for any headers within the interface MTU byte size. The MTU byte size minus the MSS Adjustment Size equals the MSS byte size, which varies by IP protocol:
Use these settings to address the case where a tunnel through the network requires a smaller MSS. If a packet has more bytes than the MSS without fragmentation, this setting enables the adjustment.
Encapsulation adds length to headers so it is helpful to configure the MSS adjustment size to allow bytes for such things as an MPLS header or tunneled traffic that has a VLAN tag.
Specifies that all subinterfaces belonging to this Layer 3 interface are untagged. PAN-OS® selects an untagged subinterface as the ingress interface based on the packet destination. If the destination is the IP address of an untagged subinterface, it maps to the subinterface. This also means that packets in the reverse direction must have their source address translated to the IP address of the untagged subinterface. A byproduct of this classification mechanism is that all multicast and broadcast packets are assigned to the base interface, not any subinterfaces. Because Open Shortest Path First (OSPF) uses multicast, the firewall does not support it on untagged subinterfaces.
Ethernet InterfaceAdvancedARP Entries
To add one or more static Address Resolution Protocol (ARP) entries, click Add and enter an IP address and its associated hardware (MAC) address. To delete an entry, select the entry and click Delete. Static ARP entries reduce ARP processing and preclude man-in-the-middle attacks for the specified addresses.
Ethernet InterfaceAdvancedND Entries
To provide neighbor information for Neighbor Discovery Protocol (NDP), click Add and enter the IP address and MAC address of the neighbor.
Enable NDP Proxy
Ethernet InterfaceAdvancedNDP Proxy
Select to enable the 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 to indicate it will act as proxy by responding to packets destined for those addresses.
It is recommended that you select Enable NDP Proxy if you use Network Prefix Translation IPv6 (NPTv6).
If Enable NDP Proxy is selected, you can filter numerous Address entries by entering a search string and clicking Apply Filter ( ).
Click Add to enter one or more IPv6 addresses, IP ranges, IPv6 subnets, or address objects for which the firewall will act as the NDP proxy. Ideally, one of these addresses is the same address as that of the source translation in NPTv6. The order of addresses does not matter.
If the address is a subnetwork, the firewall will send an ND response for all addresses in the subnet, so we recommend that you also add the IPv6 neighbors of the firewall and then select Negate to instruct the firewall not to respond to these IP addresses.
Select Negate for an address to prevent NDP proxy for that address. You can negate a subset of the specified IP address range or IP subnet.
Select to enable Link Layer Discovery Protocol (LLDP) on the interface. LLDP functions at the link layer to discover neighboring devices and their capabilities.
If LLDP is enabled, select an LLDP profile to assign to the interface or click LLDP Profile to create a new profile (see Network > Network Profiles > LLDP Profile). Select None to configure the firewall to use global defaults.
Enable in HA Passive State
If LLDP is enabled, select to allow the firewall as an HA passive firewall to pre-negotiate LLDP with its peer before the firewall becomes active.
Select the method for assigning an IPv4 address type to the interface:
Firewalls that are in a high availability (HA) active/active configuration do not support PPPoE or DHCP Client.
Based on your IP address method selection, the options displayed in the tab will vary.
Ethernet Interface AdvancedDDNS
Select Settings to make the DDNS fields available to configure.
Enable DDNS on the interface. You must initially enable DDNS to configure it. (If your DDNS configuration is unfinished, you can save it without enabling it so that you don’t lose your partial configuration.)
Update Interval (days)
Enter the interval (in days) between updates that the firewall sends to the DDNS server to update IP addresses mapped to FQDNs (range is 1 to 30; default is 1).
The firewall also updates DDNS upon receiving a new IP address for the interface from the DHCP server.
Create a Certificate Profile to verify the DDNS service. The DDNS service presents the firewall with a certificate signed by the certificate authority (CA).
Enter a hostname for the interface, which is registered with the DDNS Server (for example, host123.domain123.com, or host123). The firewall does not validate the hostname except to confirm that the syntax uses valid characters allowed by DNS for a domain name.
Select the DDNS vendor (and version) that provides DDNS service to this interface:
If you select an older version of a DDNS service that the firewall indicates will be phased out by a certain date, move to the newer version.
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.
IPv4 tab - IP
Add the IPv4 addresses configured on the interface and select them. All selected IP addresses are registered with the DDNS provider (Vendor).
IPv6 tab - IPv6
Add the IPv6 addresses configured on the interface and select them. All selected IP addresses are registered with the DDNS provider (Vendor).
Show Runtime Info
Displays the DDNS registration: DDNS provider, resolved FQDN, and the mapped IP address(es) with an asterisk (*) indicating the primary IP address. Each DDNS provider has its own return codes to indicate the status of the hostname update, and a return date, for troubleshooting purposes.
IPv4 address Type = Static
Click Add, then perform one of the following steps to specify a static IP address and network mask for the interface.
You can enter multiple IP addresses for the interface. The forwarding information base (FIB) your firewall uses determines the maximum number of IP addresses.
To delete an IP address, select the address and click Delete.
IPv4 address Type = PPPoE
Select to activate the interface for PPPoE termination.
Enter the user name for the point-to-point connection.
Enter and then confirm the password for the user name.
Show PPPoE Client Runtime Info
(Optional) Opens a dialog that displays parameters that the firewall negotiated with the Internet service provider (ISP) to establish a connection. The specific information depends on the ISP.
Select the authentication protocol for PPPoE communications: CHAP (Challenge-Handshake Authentication Protocol), PAP (Password Authentication Protocol), or the default Auto (the firewall determines the protocol). Select None to remove the current protocol assignment from the interface.
Perform one of the following steps to specify the IP address that the Internet service provider assigned (no default value):
Automatically create default route pointing to peer
Select to automatically create a default route that points to the PPPoE peer when connected.
Default Route Metric
(Optional) For the route between the firewall and Internet service provider, enter a route metric (priority level) to associate with the default route and to use for path selection (range is 1 to 65,535). The priority level increases as the numeric value decreases.
(Optional) Enter the name of the access concentrator on the Internet service provider end to which the firewall connects (no default).
(Optional) Enter the service string (no default).
Select to use passive mode. In passive mode, a PPPoE end point waits for the access concentrator to send the first frame.
IPv4 address Type = DHCP
Select to activate the DHCP client on the interface.
Automatically create default route pointing to default gateway provided by server
Select to automatically create a default route that points to the default gateway that the DHCP server provides.
Select to have the firewall (as a DHCP client) send the hostname of the interface (Option 12) to the DHCP server. If you Send Hostname, then the hostname of the firewall is the choice in the hostname field by default. You can send that name or enter a custom hostname (64 characters maximum including uppercase and lowercase letters, numbers, periods, hyphens, and underscores.
Default Route Metric
For the route between the firewall and DHCP server, optionally enter a route metric (priority level) to associate with the default route and to use for path selection (range is 1 to 65,535, no default). The priority level increases as the numeric value decreases.
Show DHCP Client Runtime Info
Select to display all settings received from the DHCP server, including DHCP lease status, dynamic IP address assignment, subnet mask, gateway, and server settings (DNS, NTP, domain, WINS, NIS, POP3, and SMTP).
Enable IPv6 on the interface
Select to enable IPv6 addressing on this interface.
Enter the 64-bit extended unique identifier (EUI-64) in hexadecimal format (for example, 00:26:08:FF:FE:DE:4E:29). If you leave this field blank, the firewall uses the EUI-64 generated from the MAC address of the physical interface. If you enable the Use interface ID as host portion option when adding an address, the firewall uses the interface ID as the host portion of that address.
Click Add and configure the following parameters for each IPv6 address:
Enable Duplication Address Detection
Ethernet InterfaceIPv6Address Resolution
Select to enable duplicate address detection (DAD), then configure the other fields in this section.
Specify the number of DAD attempts within the neighbor solicitation interval (NS Interval) before the attempt to identify neighbors fails (range is 1 to 10; default is 1).
Specify the length of time, in seconds, that a neighbor remains reachable after a successful query and response (range is 10 to 36,000; default is 30).
NS Interval (neighbor solicitation interval)
Specify the number of seconds for DAD attempts before failure is indicated (range is 1 to 10; default is 1).
Enable NDP Monitoring
Select to enable Neighbor Discovery Protocol (NDP) monitoring. When enabled, you can select NDP Monitor ( in Features column) and view information about a neighbor that the firewall discovered, such as the IPv6 address, the corresponding MAC address, and the User-ID (on a best-case basis).
Enable Router Advertisement
Ethernet InterfaceIPv6Router Advertisement
To provide stateless address auto-configuration (SLAAC) 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, click Add in the IP address table and configure the Address. If you set RA options for any IP address, you must select the Enable Router Advertisement option for the interface.
Min Interval (sec)
Specify the minimum interval, in seconds, between RAs that the firewall will send (range is 3 to 1,350; default is 200). The firewall will send RAs at random intervals between the minimum and maximum values you configure.
Max Interval (sec)
Specify the maximum interval, in seconds, between RAs that the firewall will send (range is 4 to 1,800; default is 600). The firewall will send RAs at random intervals between the minimum and maximum values you configure.
Specify the hop limit to apply to clients for outgoing packets (range is 1 to 255; default is 64). Enter 0 for no hop limit.
Specify the link maximum transmission unit (MTU) to apply to clients. Select unspecified for no link MTU (range is 1,280 to 9,192; default is unspecified).
Reachable Time (ms)
Specify the reachable time (in milliseconds) that the client will use to assume a neighbor is reachable after receiving a reachability confirmation message. Select unspecified for no reachable time value (range is 0 to 3,600,000; default is unspecified).
Retrans Time (ms)
Specify the retransmission timer that determines how long the client will wait (in milliseconds) before retransmitting neighbor solicitation messages. Select unspecified for no retransmission time (range is 0 to 4,294,967,295; default is unspecified).
Router Lifetime (sec)
Specify how long the client will use the firewall as the default gateway (range is 0 to 9,000; default is 1,800). Zero specifies that the firewall is not the default gateway. When the lifetime expires, the client removes the firewall entry from its Default Router List and uses another router as the default gateway.
If the network segment has multiple IPv6 routers, the client uses this field to select a preferred router. Select whether the RA advertises the firewall router as having a High, Medium (default), or Low priority relative to other routers on the segment.
Select to indicate to the client that addresses are available via DHCPv6.
Ethernet InterfaceIPv6Router Advertisement (cont)
Select if you want the firewall to verify that RAs sent from other routers are advertising consistent information on the link. The firewall logs any inconsistencies in a system log; the type is ipv6nd.
Select to indicate to the client that other address information (for example, DNS-related settings) is available via DHCPv6.
Include DNS information in Router Advertisement
Ethernet InterfaceIPv6DNS Support
Select to enable the firewall to send DNS information in NDP router advertisement (RA) messages from this IPv6 Ethernet interface. The other DNS Support fields in this table are visible only after you select this option.
Add one or more recursive DNS (RDNS) server addresses for the firewall to send in NDP router advertisements from this IPv6 Ethernet interface. RDNS servers send a series of DNS lookup requests to root DNS 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 those addresses 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 the maximum number of seconds after the IPv6 DNS client receives the router advertisement before the client can use the RDNS servers to resolve domain names (range is Max Interval (sec) to twice Max Interval; default is 1,200).
Add and configure 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 DNS query. For example, if a DNS client tries to submit a DNS query for “quality” without a suffix, the router appends a period and the first DNS suffix from the DNS search list to that 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 FQDN “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 suffixes on the list.
Configure the firewall with the suffixes 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 up to eight domain names (suffixes) for a DNS search list that the firewall sends—in order from top to bottom—in an NDP router advertisement to the recipient, which uses those addresses 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.
Enter the maximum number of seconds after the IPv6 DNS client receives the router advertisement that it can use a domain name (suffix) on the DNS Search List (range is the value of Max Interval (sec) to twice the Max Interval; default is 1,200).
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