Splunk alternative for firewall logs
A Splunk alternative when the job is firewall logs, not the whole SIEM
ZenShield is an on-premises firewall log analyzer for multi-vendor events—focused correlation and retention, not a Splunk Enterprise Security replacement.
What you get
What ZenShield gives a multi-vendor SOC
On-premises firewall log analytics across OEMs — normalized search, correlation, policy insight, and retention you control.
- Firewall and perimeter log volume is the funded problem—not replacing every log source in the company
- On-prem evidence and retention under your storage policy
- Cross-vendor firewall correlation across Palo Alto, Fortinet, Cisco, and peers
- A dedicated firewall analytics tier that can coexist with Splunk as the enterprise SIEM
Product honesty
- ZenShield is <strong>not a full Splunk / Splunk ES / SIEM replacement</strong>; scope is on-prem multi-vendor firewall/security log analytics only.
- UEBA, SOAR, broad IT/OT log planes, and enterprise SIEM content packs are <strong>out of scope / not claimed</strong>. Coexistence with Splunk as enterprise SIEM is supported.
- Report packs are templates and exports—not a claim that Zentryc is certified.
- ZenShield pricing stays quote-driven; no invented list price or $/GB figure on this page.
Splunk is excellent when you need a general-purpose security and observability platform: forwarders across the estate, searchable indexes for every log type, dashboards, alerts, and (with Enterprise Security) SIEM content. Many SOCs that start a “firewall visibility” project inside Splunk later discover a different problem: ingest volume and license math for high-EPS perimeter logs, retention fights between investigation windows and budget, and analysts who mostly need normalized firewall fields—src, dst, user, app, action, rule—not another empty SIEM use-case pack.
ZenShield is the narrower answer: an on-premises firewall log analyzer for Palo Alto, Fortinet FortiGate, Cisco ASA / Firepower / Meraki, Check Point, SonicWall, and Linux iptables/nftables. It is licensed separately from ZenPlus, quoted for your ingest and retention, and deliberately not positioned as Splunk Enterprise Security.
Explore ZenShield Request a demo
Who this page is for
Use this comparison if most of these are true:
- The primary pain is firewall / perimeter log volume and investigation, not “replace every log source in the company.”
- You want on-prem evidence and retention under your storage policy—not a default path that pushes firewall EPS into a cloud SIEM bill.
- Analysts need cross-vendor firewall correlation more than full SIEM content packs, UEBA, or SOAR.
If you already run Splunk as the enterprise SIEM, love the search language, and budget covers firewall EPS at your retention target, stay on Splunk for that plane—or keep Splunk as SIEM and evaluate ZenShield only as a focused firewall analytics tier. Replacing healthy Splunk ES with ZenShield to “save money” is usually the wrong move.
Also see FortiAnalyzer alternative, Panorama alternative, and SmartEvent alternative (OEM-console angles) and How to analyze firewall logs. For a separate ZenShield license note, see pricing.
Comparison
Side-by-side: platform SIEM vs focused firewall analyzer
| Splunk (typical firewall path) | ZenShield (Zentryc) | |
|---|---|---|
| Product center of gravity | General search / observability / SIEM platform | Firewall & security log analytics |
| Best-fit job | Many source types, SIEM use cases, broad dashboards | Multi-vendor firewall investigation + retention |
| Data plane | Customer-managed or Splunk Cloud | Customer on-prem appliance |
| Firewall parsers | Via add-ons / TA content; quality varies by pack and care | First-class parsers for major firewall OEMs |
| Cross-vendor firewall pivot | Possible with good CIM/normalization discipline | Core workflow |
| License shape | Ingest / SVC / workload models (quote- and plan-driven; changes by SKU) | Quote-driven ingest + retention; separate from ZenPlus |
| SIEM / ES / UEBA / SOAR | Available in the Splunk family when licensed | Out of scope — not claimed |
| Retention | Index / bucket / archive policy; Cloud entitlements vary | Customer-controlled retention on your storage |
| Compliance artifacts | Splunk reporting + ES content (when licensed) | Report packs (templates/exports—not a claim Zentryc is certified) |
| Free / trial | Splunk trial / Cloud trial paths | Demo and on-prem eval via contact |
Splunk list prices, ingest entitlements, Cloud tiers, and Enterprise Security add-ons are quote-driven and change often. ZenShield list pricing is not a self-serve matrix on pricing; ask sales for a bundle quote with ZenPlus when NOC monitoring and firewall-log scopes sit with the same team.
When to stay on Splunk
Stay if most of these are true:
- You need a platform SIEM (many source types, ES content, detections across identity + endpoint + cloud + network).
- Firewall EPS already fits the Splunk license and retention policy without painful sampling.
- Analysts live in SPL and existing Splunk dashboards; switching cost exceeds the focused-tool benefit.
- You require SOAR, UEBA, or enterprise detection content that only exists in the Splunk family.
When ZenShield is the better “firewall slice” alternative
- High firewall EPS is distorting the Splunk bill or forcing aggressive filtering.
- Sovereignty / policy wants firewall evidence on-prem with retention you size yourself.
- The estate is multi-OEM and analysts want one normalized firewall investigation UI.
- You already evaluate FortiAnalyzer alternative style OEM consoles and want the Splunk-scope honesty next to it.
- ZenPlus covers device/NOC monitoring and you want a bundle for perimeter logs without buying a second full SIEM.
Migration
Migration / coexistence sketch
- Keep Splunk as the enterprise SIEM if it already is—do not rip it for a firewall-only tool.
- Dual-run: forward a site or OEM set into ZenShield; compare investigation time and retention cost for the same incidents.
- Decide whether ZenShield is a dedicated firewall tier (Splunk stays) or the primary firewall plane for teams without a full SIEM mandate.
- Document retention, export, and who owns escalation between ZenShield and any remaining SIEM.
- Talk to Zentryc for ingest/retention sizing and optional ZenPlus + ZenShield bundle.
FAQ
Splunk firewall-log alternative FAQ
Related
ZenShield and the rest of the platform
Product page, analyst guide, pricing notes, and ZenPlus NOC comparisons when the same team owns monitoring and firewall evidence.
Next step
Evaluate the firewall slice honestly
Keep Splunk as the enterprise SIEM when that is the right fit; evaluate ZenShield when the funded problem is focused, on-prem, multi-vendor firewall analytics.