HA Links and Backup Links
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Next-Generation Firewall Docs
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PAN-OS 11.1 & Later
- PAN-OS 11.1 & Later
- PAN-OS 11.0 (EoL)
- PAN-OS 10.2
- PAN-OS 10.1
- PAN-OS 10.0 (EoL)
- PAN-OS 9.1 (EoL)
- Cloud Management of NGFWs
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- Management Interfaces
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- Launch the Web Interface
- Use the Administrator Login Activity Indicators to Detect Account Misuse
- Manage and Monitor Administrative Tasks
- Commit, Validate, and Preview Firewall Configuration Changes
- Commit Selective Configuration Changes
- Export Configuration Table Data
- Use Global Find to Search the Firewall or Panorama Management Server
- Manage Locks for Restricting Configuration Changes
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- Define Access to the Web Interface Tabs
- Provide Granular Access to the Monitor Tab
- Provide Granular Access to the Policy Tab
- Provide Granular Access to the Objects Tab
- Provide Granular Access to the Network Tab
- Provide Granular Access to the Device Tab
- Define User Privacy Settings in the Admin Role Profile
- Restrict Administrator Access to Commit and Validate Functions
- Provide Granular Access to Global Settings
- Provide Granular Access to the Panorama Tab
- Provide Granular Access to Operations Settings
- Panorama Web Interface Access Privileges
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- Reset the Firewall to Factory Default Settings
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- Plan Your Authentication Deployment
- Pre-Logon for SAML Authentication
- Configure SAML Authentication
- Configure Kerberos Single Sign-On
- Configure Kerberos Server Authentication
- Configure TACACS+ Authentication
- Configure TACACS Accounting
- Configure RADIUS Authentication
- Configure LDAP Authentication
- Configure Local Database Authentication
- Configure an Authentication Profile and Sequence
- Test Authentication Server Connectivity
- Troubleshoot Authentication Issues
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- Keys and Certificates
- Default Trusted Certificate Authorities (CAs)
- Certificate Deployment
- Configure the Master Key
- Export a Certificate and Private Key
- Configure a Certificate Profile
- Configure an SSL/TLS Service Profile
- Configure an SSH Service Profile
- Replace the Certificate for Inbound Management Traffic
- Configure the Key Size for SSL Forward Proxy Server Certificates
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- HA Overview
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- Prerequisites for Active/Active HA
- Configure Active/Active HA
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- Use Case: Configure Active/Active HA with Route-Based Redundancy
- Use Case: Configure Active/Active HA with Floating IP Addresses
- Use Case: Configure Active/Active HA with ARP Load-Sharing
- Use Case: Configure Active/Active HA with Floating IP Address Bound to Active-Primary Firewall
- Use Case: Configure Active/Active HA with Source DIPP NAT Using Floating IP Addresses
- Use Case: Configure Separate Source NAT IP Address Pools for Active/Active HA Firewalls
- Use Case: Configure Active/Active HA for ARP Load-Sharing with Destination NAT
- Use Case: Configure Active/Active HA for ARP Load-Sharing with Destination NAT in Layer 3
- HA Clustering Overview
- HA Clustering Best Practices and Provisioning
- Configure HA Clustering
- Refresh HA1 SSH Keys and Configure Key Options
- HA Firewall States
- Reference: HA Synchronization
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- Use the Dashboard
- Monitor Applications and Threats
- Monitor Block List
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- Report Types
- View Reports
- Configure the Expiration Period and Run Time for Reports
- Disable Predefined Reports
- Custom Reports
- Generate Custom Reports
- Generate the SaaS Application Usage Report
- Manage PDF Summary Reports
- Generate User/Group Activity Reports
- Manage Report Groups
- Schedule Reports for Email Delivery
- Manage Report Storage Capacity
- View Policy Rule Usage
- Use External Services for Monitoring
- Configure Log Forwarding
- Configure Email Alerts
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- Configure Syslog Monitoring
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- Traffic Log Fields
- Threat Log Fields
- URL Filtering Log Fields
- Data Filtering Log Fields
- HIP Match Log Fields
- GlobalProtect Log Fields
- IP-Tag Log Fields
- User-ID Log Fields
- Decryption Log Fields
- Tunnel Inspection Log Fields
- SCTP Log Fields
- Authentication Log Fields
- Config Log Fields
- System Log Fields
- Correlated Events Log Fields
- GTP Log Fields
- Audit Log Fields
- Syslog Severity
- Custom Log/Event Format
- Escape Sequences
- Forward Logs to an HTTP/S Destination
- Firewall Interface Identifiers in SNMP Managers and NetFlow Collectors
- Monitor Transceivers
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- User-ID Overview
- Enable User-ID
- Map Users to Groups
- Enable User- and Group-Based Policy
- Enable Policy for Users with Multiple Accounts
- Verify the User-ID Configuration
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- App-ID Overview
- App-ID and HTTP/2 Inspection
- Manage Custom or Unknown Applications
- Safely Enable Applications on Default Ports
- Applications with Implicit Support
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- Prepare to Deploy App-ID Cloud Engine
- Enable or Disable the App-ID Cloud Engine
- App-ID Cloud Engine Processing and Policy Usage
- New App Viewer (Policy Optimizer)
- Add Apps to an Application Filter with Policy Optimizer
- Add Apps to an Application Group with Policy Optimizer
- Add Apps Directly to a Rule with Policy Optimizer
- Replace an RMA Firewall (ACE)
- Impact of License Expiration or Disabling ACE
- Commit Failure Due to Cloud Content Rollback
- Troubleshoot App-ID Cloud Engine
- Application Level Gateways
- Disable the SIP Application-level Gateway (ALG)
- Maintain Custom Timeouts for Data Center Applications
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- Decryption Overview
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- Keys and Certificates for Decryption Policies
- SSL Forward Proxy
- SSL Forward Proxy Decryption Profile
- SSL Inbound Inspection
- SSL Inbound Inspection Decryption Profile
- SSL Protocol Settings Decryption Profile
- SSH Proxy
- SSH Proxy Decryption Profile
- Profile for No Decryption
- SSL Decryption for Elliptical Curve Cryptography (ECC) Certificates
- Perfect Forward Secrecy (PFS) Support for SSL Decryption
- SSL Decryption and Subject Alternative Names (SANs)
- TLSv1.3 Decryption
- High Availability Not Supported for Decrypted Sessions
- Decryption Mirroring
- Configure SSL Forward Proxy
- Configure SSL Inbound Inspection
- Configure SSH Proxy
- Configure Server Certificate Verification for Undecrypted Traffic
- Post-Quantum Cryptography Detection and Control
- Enable Users to Opt Out of SSL Decryption
- Temporarily Disable SSL Decryption
- Configure Decryption Port Mirroring
- Verify Decryption
- Activate Free Licenses for Decryption Features
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- Policy Types
- Policy Objects
- Track Rules Within a Rulebase
- Enforce Policy Rule Description, Tag, and Audit Comment
- Move or Clone a Policy Rule or Object to a Different Virtual System
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- External Dynamic List
- Built-in External Dynamic Lists
- Configure the Firewall to Access an External Dynamic List
- Retrieve an External Dynamic List from the Web Server
- View External Dynamic List Entries
- Exclude Entries from an External Dynamic List
- Enforce Policy on an External Dynamic List
- Find External Dynamic Lists That Failed Authentication
- Disable Authentication for an External Dynamic List
- Register IP Addresses and Tags Dynamically
- Use Dynamic User Groups in Policy
- Use Auto-Tagging to Automate Security Actions
- CLI Commands for Dynamic IP Addresses and Tags
- Application Override Policy
- Test Policy Rules
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- Network Segmentation Using Zones
- How Do Zones Protect the Network?
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PAN-OS 11.1 & Later
- PAN-OS 11.1 & Later
- PAN-OS 11.0 (EoL)
- PAN-OS 10.2
- PAN-OS 10.1
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- Tap Interfaces
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- Layer 2 and Layer 3 Packets over a Virtual Wire
- Port Speeds of Virtual Wire Interfaces
- LLDP over a Virtual Wire
- Aggregated Interfaces for a Virtual Wire
- Virtual Wire Support of High Availability
- Zone Protection for a Virtual Wire Interface
- VLAN-Tagged Traffic
- Virtual Wire Subinterfaces
- Configure Virtual Wires
- Configure a PPPoE Client on a Subinterface
- Configure an IPv6 PPPoE Client
- Configure an Aggregate Interface Group
- Configure Bonjour Reflector for Network Segmentation
- Use Interface Management Profiles to Restrict Access
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- DHCP Overview
- Firewall as a DHCP Server and Client
- Firewall as a DHCPv6 Client
- DHCP Messages
- Dynamic IPv6 Addressing on the Management Interface
- Configure an Interface as a DHCP Server
- Configure an Interface as a DHCPv4 Client
- Configure an Interface as a DHCPv6 Client with Prefix Delegation
- Configure the Management Interface as a DHCP Client
- Configure the Management Interface for Dynamic IPv6 Address Assignment
- Configure an Interface as a DHCP Relay Agent
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- DNS Overview
- DNS Proxy Object
- DNS Server Profile
- Multi-Tenant DNS Deployments
- Configure a DNS Proxy Object
- Configure a DNS Server Profile
- Use Case 1: Firewall Requires DNS Resolution
- Use Case 2: ISP Tenant Uses DNS Proxy to Handle DNS Resolution for Security Policies, Reporting, and Services within its Virtual System
- Use Case 3: Firewall Acts as DNS Proxy Between Client and Server
- DNS Proxy Rule and FQDN Matching
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- NAT Rule Capacities
- Dynamic IP and Port NAT Oversubscription
- Dataplane NAT Memory Statistics
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- Translate Internal Client IP Addresses to Your Public IP Address (Source DIPP NAT)
- Create a Source NAT Rule with Persistent DIPP
- PAN-OS
- Strata Cloud Manager
- Enable Clients on the Internal Network to Access your Public Servers (Destination U-Turn NAT)
- Enable Bi-Directional Address Translation for Your Public-Facing Servers (Static Source NAT)
- Configure Destination NAT with DNS Rewrite
- Configure Destination NAT Using Dynamic IP Addresses
- Modify the Oversubscription Rate for DIPP NAT
- Reserve Dynamic IP NAT Addresses
- Disable NAT for a Specific Host or Interface
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- Network Packet Broker Overview
- How Network Packet Broker Works
- Prepare to Deploy Network Packet Broker
- Configure Transparent Bridge Security Chains
- Configure Routed Layer 3 Security Chains
- Network Packet Broker HA Support
- User Interface Changes for Network Packet Broker
- Limitations of Network Packet Broker
- Troubleshoot Network Packet Broker
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- Enable Advanced Routing
- Logical Router Overview
- Configure a Logical Router
- Create a Static Route
- Configure BGP on an Advanced Routing Engine
- Create BGP Routing Profiles
- Create Filters for the Advanced Routing Engine
- Configure OSPFv2 on an Advanced Routing Engine
- Create OSPF Routing Profiles
- Configure OSPFv3 on an Advanced Routing Engine
- Create OSPFv3 Routing Profiles
- Configure RIPv2 on an Advanced Routing Engine
- Create RIPv2 Routing Profiles
- Create BFD Profiles
- Configure IPv4 Multicast
- Configure MSDP
- Create Multicast Routing Profiles
- Create an IPv4 MRoute
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PAN-OS 11.2
- PAN-OS 11.2
- PAN-OS 11.1
- PAN-OS 11.0 (EoL)
- PAN-OS 10.2
- PAN-OS 10.1
- PAN-OS 10.0 (EoL)
- PAN-OS 9.1 (EoL)
- PAN-OS 9.0 (EoL)
- PAN-OS 8.1 (EoL)
- Cloud Management and AIOps for NGFW
HA Links and Backup Links
The firewalls in an HA pair use HA links to synchronize data and maintain state information. Some
models of the firewall have dedicated HA ports—Control link (HA1) and Data link (HA2),
while others require you to use the in-band ports or management ports as HA links.
- For firewalls with dedicated HA ports, use these ports to manage communication and synchronization between the firewalls. For details, see HA Ports on Palo Alto Networks Firewalls.
- For firewalls without dedicated HA ports such as the PA-220 and PA-220R firewalls, as a best practice use the management port for the HA1 port, and use the dataplane port for the HA1 backup. If you use the management port and configured a Permitted IP list, you must add the peer HA1 IP address to the Permitted IP list. (If you didn't configure a Permitted IP list, you don't need to add the peer HA1 IP address.)You can configure data ports as both dedicated HA interfaces and as dedicated backup HA interfaces. For firewalls without dedicated HA interfaces, such as the PA-200 and PA-400 Series, it is required to configure a data port as a HA interface.Data ports configured as HA1, HA2, or HA3 interfaces can be connected directly to each HA interface on the firewall or connected through a Layer2 switch. For data ports configured as an HA3 interface, you must enable jumbo frames as HA3 messages exceed 1,500 bytes.
HA peers in an HA cluster can be a combination of standalone
members and HA pairs. HA cluster members use an HA4 link and HA4
backup link to perform session state syncronization. HA1 (control
link), HA2 (data link), and HA3 (packet-forwarding link) are not
supported between cluster members that aren’t HA pairs.
HA Links and Backup
Links | Description |
---|---|
Control Link | The HA1 link is used to exchange hellos,
heartbeats, and HA state information, and management plane sync
for routing, and User-ID information. The firewalls also use this
link to synchronize configuration changes with its peer. The HA1
link is a Layer 3 link and requires an IP address. ICMP is
used to exchange heartbeats between HA peers. Ports used for
HA1—TCP port 28769 and 28260 for clear text communication; port
28 for encrypted communication (SSH over TCP). If you enable
encryption on the HA1 link, you can also Refresh HA1 SSH Keys and Configure Key Options. |
Data Link | The HA2 link is used to synchronize sessions,
forwarding tables, IPSec security associations and ARP tables between
firewalls in an HA pair. Data flow on the HA2 link is always unidirectional
(except for the HA2 keep-alive); it flows from the active or active-primary
firewall to the passive or active-secondary firewall. The HA2 link
is a Layer 2 link, and it uses ether type 0x7261 by default. Ports
used for HA2—The HA data link can be configured to use either IP
(protocol number 99) or UDP (port 29281) as the transport, and thereby
allow the HA data link to span subnets. |
HA1 and HA2 Backup Links | Provide redundancy for the HA1 and the HA2
links. In-band ports can be used for backup links for both HA1 and
HA2 connections when dedicated backup links are not available. Consider
the following guidelines when configuring backup HA links:
Palo Alto Networks recommends enabling heartbeat
backup (uses port 28771 on the MGT interface) if you use an in-band
port for the HA1 or the HA1 backup links. |
Packet-Forwarding Link | In addition to HA1 and HA2 links, an active/active
deployment also requires a dedicated HA3 link. The firewalls use
this link for forwarding packets to the peer during session setup
and asymmetric traffic flow. The HA3 link is a Layer 2 link that
uses MAC-in-MAC encapsulation. It does not support Layer 3 addressing
or encryption. PA-7000 Series firewalls synchronize sessions across
the NPCs one-for-one. On PA-800 Series, PA-3200 Series, PA-3400
Series, PA-5200 Series, and PA-5400 Series firewalls, you can configure
aggregate interfaces as an HA3 link. The aggregate interfaces can
also provide redundancy for the HA3 link; you cannot configure backup
links for the HA3 link. On PA-3200 Series, PA-3400 Series, PA-5200
Series, PA-5400 Series, and PA-7000 Series firewalls, the dedicated
HSCI ports support the HA3 link. The firewall adds a proprietary
packet header to packets traversing the HA3 link, so the MTU over
this link must be greater than the maximum packet length forwarded. |
HA4 Link and HA4 Backup Link | The HA4 link and HA4 backup link perform
session cache synchronization among all HA cluster members having
the same cluster ID. The HA4 link between cluster members detects
connectivity failures between cluster members by sending and receiving
Layer 2 keepalive messages. View the status of the HA4 and HA4 backup
links on the firewall dashboard. |