PA-7000 Series Layer 3 Interface
- Network > Interfaces > Ethernet
To configure a Layer 3 interface, click the name of an Interface (ethernet1/1, for example) that is not configured 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 Profileto define a new profile (see Device > Server Profiles > NetFlow). Select
Noneto remove the current NetFlow server 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 Systemto define a new vsys.
Select a security zone for the interface or click
Zoneto define a new zone. Select
Noneto remove the current zone assignment from the interface.
Select the interface speed in Mbps (
1000) or select
Select whether the interface transmission mode is full-duplex (
full), half-duplex (
half), or negotiated automatically (
Select whether the interface status is enabled (
up), disabled (
down), or determined automatically (
Select a profile that defines the protocols (for example, SSH, Telnet, and HTTP) you can use to manage the firewall over this interface. Select
Noneto remove the current profile assignment from the interface.
Enter the maximum transmission unit (MTU) in bytes for packets sent on this interface (576-9,192; 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 neededmessage 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
tunnelthrough 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.
To add one or more static Address Resolution Protocol (ARP) entries, click
Addand 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.
To provide neighbor information for Neighbor Discovery Protocol (NDP), click
Addand enter the IP address and MAC address of the neighbor.
Enable NDP 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 Proxyif you use Network Prefix Translation IPv6 (NPTv6).
Enable NDP Proxyis selected, you can filter numerous Address entries by entering a search string and clicking Apply Filter ( ).
Addto 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
Negateto instruct the firewall not to respond to these IP addresses.
Negatefor 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 Profileto create a new profile (see Network > Network Profiles > LLDP Profile). Select
Noneto 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 active/active high availability (HA) mode do not support PPPoE or DHCP Client.
Based on your IP address method selection, the options displayed in the tab will vary.
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
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
Noneto 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 1-65,535). 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.
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.
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 1-65,535, 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 portionoption when adding an address, the firewall uses the interface ID as the host portion of that address.
Addand configure the following parameters for each IPv6 address:
Enable Duplication Address Detection
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 1-10; default is 1).
Specify the length of time, in seconds, that a neighbor remains reachable after a successful query and response (range is 10-36,000; default is 30).
NS Interval (neighbor solicitation interval)
Specify the number of seconds for DAD attempts before failure is indicated (range is 1-10; 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
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
Addin the IP address table and configure the Address. If you set RA options for any IP address, you must select the
Enable Router Advertisementoption for the interface.
Min Interval (sec)
Specify the minimum interval, in seconds, between RAs that the firewall will send (range is 3-1,350; 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 4-1,800; 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 1-255; default is 64). Enter 0 for no hop limit.
Specify the link maximum transmission unit (MTU) to apply to clients. Select
unspecifiedfor no link MTU (range is 1,280-9,192; 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
unspecifiedfor no reachable time value (range is 0-3,600,000; 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
unspecifiedfor no retransmission time (range is 0-4,294,967,295; default is unspecified).
Router Lifetime (sec)
Specify how long, in second, the client will use the firewall as the default gateway (range is 0-9,000; 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
Lowpriority relative to other routers on the segment.
Select to indicate to the client that addresses are available via DHCPv6.
Router 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
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
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.
Addone 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 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 those addresses in the same order. Select a server and
Move Downto change the order of the servers or
Deletea 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 that it can use the RDNS servers to resolve domain names (range is the value of Max Interval (sec) to twice the Max Interval; default is 1,200).
Addand 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 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 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 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 a maximum of eight domain names (suffixes) for a DNS search list that the firewall sends—in the order listed 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 Downto change the order of the suffixes or
Deletea suffix from the list 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).