Navigating Firewall Migrations: Greatest Practices and Palo Alto to Cisco Subsequent-Gen Firewall Specifics

Migrating firewalls is usually a advanced endeavor, usually involving intricate insurance policies, essential purposes, and the necessity for seamless transition. This put up distills key insights from skilled architects on greatest practices for any firewall migration, after which dives into the distinctive concerns when transferring from Palo Alto Networks to Cisco Subsequent-Era Firewalls.

Part 0: The Background

Buyer management has determined emigrate from PAN to Cisco.  This was a enterprise resolution primarily based on elevated costs by PAN.  In contrast to many firewall migration initiatives CX helps, this engagement had the next complicating components:

1. Lack of current-state documentation.
2. Lack of awareness of present id resolution. Extra particularly, we recognized (with effort) that there was a must make Cisco & PAN co-exist due to many situations of identity-based firewall enforcement.
3. Lack of awareness of firewall historical past (i.e. WHY is there a firewall right here/what community segments want isolation).
4. Lack of awareness/documentation of applications-and how/the place the firewall coverage helps the purposes.
5. 24/7 setting: There is no such thing as a ‘after-hours’ so each migration effort required vital planning.

Part 1: Common Firewall Migration Greatest Practices

A profitable firewall migration hinges on meticulous planning, thorough execution, and diligent post-migration actions.  There is no such thing as a instrument that may substitute good practices and this part’s intent is to arrange an engineer with abilities required to avoid wasting one’s sanity:

1. Complete Prep Work:

• Pre-migration Cleanup & Optimization: Earlier than you even take into consideration transferring, clear up your current firewall. This contains analyzing rule and NAT hit-counts to establish unused or redundant insurance policies, and performing object de-duplication to streamline configurations.  Would you progress homes with out first decluttering and throwing away trash?  If not, why would you progress stale or irrelevant firewall coverage?  A great greatest follow is to make this one thing the client is accountable for.  Like transferring, you’ll be able to’t declutter indefinitely, so guarantee there’s a timeline to which the client is held accountable to.
• Change Administration: Ideally, implement a configuration freeze on the supply firewall. If not potential, set up sturdy change monitoring to duplicate any new guidelines or modifications throughout each the previous and new firewalls.
• Stakeholder Engagement: Determine all mission-critical purposes and their key stakeholders. Their enter is essential for understanding visitors flows and validating post-migration performance.
• Documentation is King:
  • Develop an in depth Methodology of Process (MOP): Define each step, together with whether or not you’ll carry out a ‘arduous’ cutover or an incremental/phased migration. Embrace clear time goals.
  • Conduct Peer Evaluations: Have a number of eyes in your MOP and configurations.
  • Create a Thorough Take a look at Plan: This isn’t nearly testing purposes; it’s about testing your take a look at plan itself. Guarantee it covers all essential functionalities and edge circumstances.
  • Design a Rollback Plan: All the time have a transparent technique to revert to the earlier state if points come up.

2. Flawless Migration Execution:

• Conduct a ‘Dry-Run’: If potential, simulate the migration in a take a look at setting to establish potential points earlier than the precise cutover.
• Validate ARP Tables: Verify ARP tables each earlier than and after the migration to make sure correct community connectivity.
• Optimize Important Site visitors: Develop pre-filters or ‘fastpath’ guidelines for essential purposes to make sure their efficiency isn’t impacted.
• Pre-stage Monitoring Instruments: Put together customized searches and packet captures prematurely to shortly diagnose points throughout the migration.
• On-Name Help: Have utility testers and house owners available or on a devoted name throughout the migration window.  Essential observe: These MAY NOT be the identical individuals.  Usually, we got testers, who lacked any understanding of how the applying labored.  Guarantee it’s effectively documented the place this expertise lives.  Supply/vacation spot IPs & L4 ports-who is aware of these low-level particulars?

3. Submit-Migration Actions for Stability & Optimization:

• Overview Submit-Migration Studies: Completely analyze any reviews generated by migration instruments to establish and handle lingering points.
• Replace Documentation: Guarantee all community diagrams, coverage paperwork, and operational procedures are up to date to replicate the brand new firewall configuration.
• Steady Monitoring: Implement sturdy monitoring to trace efficiency, safety occasions, and potential anomalies.
• Coaching and Help: Educate your operations staff on the brand new platform and its administration.
• Ongoing Optimization: Firewall insurance policies usually are not static. Frequently evaluate and optimize guidelines to keep up effectivity and safety posture.

Finish-to-Finish Migration Process (Common Steps):

1. Obtain and launch the migration instrument.
2. Export the supply firewall’s configuration file.
3. Overview the pre-migration report.
4. Map interfaces, safety zones, and interface teams.
5. Map configurations with purposes.
6. Specify vacation spot parameters and choose options for migration.
7. Optimize, evaluate, and validate the migrated configuration.
8. Push the migrated configuration to the brand new firewall’s administration middle (e.g., FMC).
9. Deploy the configuration to the firewall.
10. Obtain and evaluate the post-migration report.
11. Configure any further guide gadgets.

Part 2: Key Variations and Migration Methods from Palo Alto to Cisco Subsequent-Era Firewalls

Migrating from Palo Alto Networks to Cisco Safe Firewall brings its personal set of nuances, notably regarding id integration, coverage conversion, and platform-specific capabilities.

1. Identification Coexistence Throughout Migration:

A big problem is guaranteeing consumer id mappings (e.g., “Lisa is 10.14.10.7”) are constant throughout each Palo Alto and Cisco firewalls throughout the interim migration interval.

• The Drawback: Cisco wants to pay attention to user-to-IP mappings that Palo Alto’s Person-ID brokers or VPN gateways already know. With out this, visitors from recognized customers is perhaps denied by the Cisco firewall as a result of it lacks the required context.
• Options Explored:
  • Devoted ISE-PIC Deployment: Whereas tried, utilizing an current ISE deployment for this function might be problematic, particularly since PassiveID is incompatible with 802.1x Machine Authentication. Be aware: ISE-PIC has reached Finish-of-Life.
  • Syslog Forwarding: A viable technique includes configuring the Palo Alto VPN firewall to ahead Syslog messages containing user-to-IP mappings to Cisco ISE.
  • Energetic Listing Brokers: Deploying brokers on Energetic Listing servers or terminal servers might help each platforms collect id info.

By together with a mixture of syslog forwarding on the PAN VPN firewall and new Cisco brokers on the client AD servers, we have been capable of migrate a downstream PAN firewall to Cisco.

Ought to customers be coming from on-premise (passive authentication) or by way of remote-access VPN, the Cisco firewall could have a user->IP mapping to verify the suitable firewall coverage is being matched.

As of Firewall Administration Middle 7.6, the passive ID performance is out there straight with out the necessity for ISE-PIC (which went EOL on 5/5/2025).

2. Coverage Conversion with the Safe Firewall Migration Device:

The Cisco Safe Firewall migration instrument is designed to help with this transition, however understanding its capabilities and limitations is vital.

• • Extraction & Mixture: The instrument can extract and mix Palo Alto configurations, figuring out parts like Entry Management guidelines, Community/Port objects, Interfaces, Routes, and Functions.
  • Function Choice: You possibly can choose which elements of the configuration (e.g., Interfaces, Routes, Entry Management) emigrate.
  • Utility Mapping: It’s essential to resolve any clean or invalid utility mappings. In some circumstances, you would possibly want so as to add port-based equivalents if a direct utility mapping isn’t obtainable. Assets like Cisco AppID and Palo Alto’s Applipedia might help.
  • Bulk Actions & Optimization: The instrument facilitates bulk actions and permits for ACL optimization, however keep in mind to pre-stage File and IPS insurance policies within the Cisco Firepower Administration Middle (FMC).

3. Palo Alto Configuration Limitations for Migration:

• • PAN-OS Model: The supply Palo Alto firewall should be operating PAN-OS software program model 8.0 or greater for the migration instrument to operate appropriately.
  • VSYS Migration: The instrument helps migration of both single or multi-vsys configurations, that are sometimes merged with VRFs to realize segmentation in Cisco FTD.
  • System Configuration: Important system configurations, akin to Platform Insurance policies (e.g., NTP, SSH entry) in FTD, are usually not migrated by the instrument and require guide setup.

4. Particular Challenges and Guide Configurations:

A number of parts require guide consideration or have totally different implementations between the 2 platforms:

• NAT IP and Port Oversubscription: Palo Alto can deal with greater ranges of NAT oversubscription (e.g., 1x, 2x, 4x, 8x reuse of similar handle/port). When migrating to Cisco, you usually want to extend the PAT pool dimension to accommodate this.
• URL Wildcards: Palo Alto makes use of characters like * or ^ for URL wildcards, whereas Cisco sometimes helps substring matching (e.g., cisco.com as a substitute of *.cisco.com). These want adjustment.
• Nested Object Teams: Community and port object teams nested deeper than 10 ranges usually are not supported in Cisco FMC and can want flattening.
• Identification Realm/Energetic Listing Integration: Whereas newer variations of the migration instrument (FMT 7.7+) assist AD/Realm integration, you’ll usually must manually add id to relevant guidelines and pre-stage the Realm and AD configurations within the FMC.
• NAT Supply Alternative: Manually substitute NAT supply in Entry Management Coverage (ACP) guidelines with the NAT vacation spot (i.e., swap the translated handle with the unique vacation spot).
• Unmigrated Objects Requiring Guide Configuration:
  • Time-based entry management guidelines.  Cisco doesn’t at the moment assist time-based entry management guidelines.
  • Identification-based entry management guidelines: You’ll must explicitly affiliate id teams or particular person identities.
  • FQDN objects: Particularly these beginning with or containing particular characters. Wildcard FQDNs usually want substitute or updates.
  • URL Filtering Insurance policies: Add the respective classes as insurance policies utilizing URL filtering may not translate straight.
  • Utility Mapping: If a rule in Palo Alto used “utility default” for service, it can probably be migrated as “any” service in Cisco, requiring guide refinement.  In some case we added port-based equivalents.

• • Negate Guidelines: Palo Alto’s “enable X however exclude Y” logic must be translated into express “deny” guidelines in FTD.  Cisco doesn’t at the moment assist negate guidelines.  This was completed by merely implementing a ‘deny’ rule in FTD.
  • Dynamic Routing: Requires guide configuration.  This won’t be ported by way of the migration instrument.
  • Route Reflector: Add FTD as an eBGP peer manually.  Extra particularly, cisco doesn’t at the moment (as of this weblog posting) assist iBGP route reflector configuration.  This was overcome by manually configuring a brand new eBGP autonomous quantity for the firewall.  This additionally required the extra configuration of ‘allow-as in’ as there have been situations the place route propagation hair pinned the firewall.

5. Partially Supported, Ignored, or Disabled Objects:

Bear in mind that sure configurations usually are not totally supported or are ignored throughout migration:

• Administration Settings (like NTP, SSH entry).
• Syslog Dynamic Routing.
• Service Insurance policies (these usually translate to FlexConfig in FTD).
• Distant-Entry VPN reserved IP addresses (require workarounds by way of ISE or AD).
• Machine-Particular Website-to-Website VPN configurations.
• Connection log settings.

By adhering to basic greatest practices and understanding these particular variations when migrating from Palo Alto to Cisco Subsequent-Era Firewalls, organizations can obtain a smoother, safer, and environment friendly transition.