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

Migrating firewalls is usually a advanced endeavor, typically involving intricate insurance policies, crucial functions, and the necessity for seamless transition. This submit distills key insights from skilled architects on finest practices for any firewall migration, after which dives into the distinctive issues when transferring from Palo Alto Networks to Cisco Subsequent-Technology Firewalls.

Part 0: The Background

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

1. Lack of current-state documentation.
2. Lack of knowledge of present identification resolution. Extra particularly, we recognized (with effort) that there was a must make Cisco & PAN co-exist due to many cases of identity-based firewall enforcement.
3. Lack of knowledge of firewall historical past (i.e. WHY is there a firewall right here/what community segments want isolation).
4. Lack of knowledge/documentation of applications-and how/the place the firewall coverage helps the functions.
5. 24/7 surroundings: There isn’t any ‘after-hours’ so each migration effort required vital planning.

Part 1: Normal Firewall Migration Greatest Practices

A profitable firewall migration hinges on meticulous planning, thorough execution, and diligent post-migration actions.  There isn’t any software that may exchange 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 determine 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 finest observe is to make this one thing the shopper is chargeable for.  Like transferring, you possibly can’t declutter indefinitely, so guarantee there’s a timeline to which the shopper is held accountable to.
• Change Administration: Ideally, implement a configuration freeze on the supply firewall. If not potential, set up strong change monitoring to duplicate any new guidelines or modifications throughout each the previous and new firewalls.
• Stakeholder Engagement: Determine all mission-critical functions and their key stakeholders. Their enter is essential for understanding visitors flows and validating post-migration performance.
• Documentation is King:
  • Develop an in depth Technique of Process (MOP): Define each step, together with whether or not you’ll carry out a ‘arduous’ cutover or an incremental/phased migration. Embody clear time aims.
  • 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 functions; it’s about testing your check plan itself. Guarantee it covers all crucial functionalities and edge instances.
  • 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 check surroundings to determine 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 Essential Visitors: Develop pre-filters or ‘fastpath’ guidelines for crucial functions to make sure their efficiency isn’t impacted.
• Pre-stage Monitoring Instruments: Put together customized searches and packet captures upfront to shortly diagnose points through the migration.
• On-Name Assist: Have software testers and house owners available or on a devoted name through the migration window.  Vital word: These MAY NOT be the identical individuals.  Typically, we got testers, who lacked any understanding of how the appliance 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:

• Evaluate Submit-Migration Experiences: Totally analyze any studies generated by migration instruments to determine and deal with 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 strong monitoring to trace efficiency, safety occasions, and potential anomalies.
• Coaching and Assist: Educate your operations group on the brand new platform and its administration.
• Ongoing Optimization: Firewall insurance policies will not be static. Recurrently evaluate and optimize guidelines to take care of effectivity and safety posture.

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

1. Obtain and launch the migration software.
2. Export the supply firewall’s configuration file.
3. Evaluate the pre-migration report.
4. Map interfaces, safety zones, and interface teams.
5. Map configurations with functions.
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 extra handbook gadgets.

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

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

1. Identification Coexistence Throughout Migration:

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

• The Downside: Cisco wants to concentrate on user-to-IP mappings that Palo Alto’s Person-ID brokers or VPN gateways already know. With out this, visitors from recognized customers is likely to be denied by the Cisco firewall as a result of it lacks the mandatory 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. Observe: 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 may also help each platforms collect identification data.

By together with a mixture of syslog forwarding on the PAN VPN firewall and new Cisco brokers on the shopper AD servers, we have been in a position to 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 may have a user->IP mapping to verify the suitable firewall coverage is being matched.

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

2. Coverage Conversion with the Safe Firewall Migration Software:

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

• • Extraction & Mixture: The software can extract and mix Palo Alto configurations, figuring out components like Entry Management guidelines, Community/Port objects, Interfaces, Routes, and Functions.
  • Function Choice: You’ll be able to choose which elements of the configuration (e.g., Interfaces, Routes, Entry Management) emigrate.
  • Utility Mapping: It’s essential to resolve any clean or invalid software mappings. In some instances, you would possibly want so as to add port-based equivalents if a direct software mapping isn’t obtainable. Assets like Cisco AppID and Palo Alto’s Applipedia may also help.
  • Bulk Actions & Optimization: The software 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 Heart (FMC).

3. Palo Alto Configuration Limitations for Migration:

• • PAN-OS Model: The supply Palo Alto firewall should be working PAN-OS software program model 8.0 or larger for the migration software to perform accurately.
  • VSYS Migration: The software helps migration of both single or multi-vsys configurations, that are usually merged with VRFs to realize segmentation in Cisco FTD.
  • System Configuration: Essential system configurations, comparable to Platform Insurance policies (e.g., NTP, SSH entry) in FTD, are usually not migrated by the software and require handbook setup.

4. Particular Challenges and Guide Configurations:

A number of components require handbook consideration or have totally different implementations between the 2 platforms:

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

• • Negate Guidelines: Palo Alto’s “permit X however exclude Y” logic must be translated into express “deny” guidelines in FTD.  Cisco doesn’t at present assist negate guidelines.  This was achieved by merely implementing a ‘deny’ rule in FTD.
  • Dynamic Routing: Requires handbook configuration.  This is not going to be ported by way of the migration software.
  • Route Reflector: Add FTD as an eBGP peer manually.  Extra particularly, cisco doesn’t at present (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 cases the place route propagation hair pinned the firewall.

5. Partially Supported, Ignored, or Disabled Objects:

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

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

---

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