PA-7000 Series Layer 3 Interface
Table of Contents
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 | Configured In | Description |
|---|---|---|
Interface Name | Ethernet Interface | The interface name is predefined and you
cannot change it. |
Comment | Enter an optional description for the interface. | |
Interface Type | Select Layer3. | |
Netflow Profile | 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. | |
Virtual Router | 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. | |
Virtual System | 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. | |
Security Zone | 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. | |
Link Speed | Select the interface speed in Mbps (10, 100, or 1000)
or select auto. | |
Link Duplex | Select whether the interface transmission
mode is full-duplex (full), half-duplex (half),
or negotiated automatically (auto). | |
Link State | Select whether the interface status is enabled (up),
disabled (down), or determined automatically
(auto). | |
Management Profile | 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. | |
MTU | 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. | |
Untagged Subinterface | 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. | |
IP Address MAC Address | 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. | |
IPv6 Address MAC Address | 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 | 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 ( 
| |
Address | 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. | |
Negate | 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. | |
Enable LLDP | Select to enable Link Layer Discovery Protocol
(LLDP) on the interface. LLDP functions at the link layer to discover neighboring
devices and their capabilities. | |
LLDP Profile | 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. | |
Type | 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. | |
Settings | Select Settings to
make the DDNS fields available to configure. | |
Enable | 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. | |
Certificate Profile | Create a Certificate Profile to
verify the DDNS service. The DDNS service presents the firewall with
a certificate signed by the certificate authority (CA). | |
Hostname | 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. | |
Vendor | 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 | ||
IP | 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 | ||
Enable | Select to activate the interface for PPPoE termination. | |
Username | Enter the username for the point-to-point connection. | |
Password/Confirm Password | Enter and then confirm the password for
the username. | |
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. | |
Authentication | 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. | |
Static Address | 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. | |
Access Concentrator | (Optional) Enter the name of the
access concentrator on the Internet service provider end to which the
firewall connects (no default). | |
Service | (Optional) Enter the service string
(no default). | |
Passive | 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 | ||
Enable | 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. | |
Send Hostname | 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. | |
Interface ID | 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. | |
Address | Click Add and 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. | |
DAD Attempts | 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). | |
Reachable Time | 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 ( 
| |
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 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. | |
Hop Limit | 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. | |
Link MTU | 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. | |
Router Preference | 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. | |
Managed Configuration | Select to indicate to the client that addresses
are available via DHCPv6. | |
Consistency Check | 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. | |
Other Configuration | 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. | |
Server | 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. | |
Lifetime | 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). | |
Suffix | 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. | |
Lifetime | 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). | |