Connect. Secure. Manage.
Cisco Firewall Security Audit
Assess Cisco firewall access rules, NAT, management exposure and logging, producing an actionable record rather than a compliance guarantee.
Devices supported
across the UK
Client locations
supported
Traffic handled
at peak time
Average
response time
Average response is not a resolution time or a contractual guarantee. Support scope and response commitments are agreed for each engagement.
A Cisco firewall security audit checks the live rules, admin access and processes around the firewall. We also consider routes, address translation and exceptions that may affect those rules. The review has a defined scope and findings tied to evidence. The number of rules alone does not tell you how well the service is protected.
Defined trust
Make access boundaries explicit rather than relying on an assumed internal network.
Controlled access
Connect identity, policy and network enforcement to the services people actually use.
Evidence for change
Test the intended security outcome and retain useful operational records.
Set the audit boundary and evidence requirements
We agree which firewall devices, management platforms, contexts and connected services are included. Internet edges, internal segmentation and remote-access gateways have different duties. The audit plan records the business systems protected by each device and identifies dependencies outside the firewall team's control.
We also distinguish a setup audit from active testing. Reviewing an exported policy can identify potential problems. But it cannot prove every traffic path or app outcome. Where live validation is needed, we agree the authorisation, test window and evidence before conducting checks that could affect production services.
Standards & partnerships
Confidence in the team behind your network.
Cisco Partner
Cisco Meraki
Cyber Essentials
Cyber Essentials PlusMCI Network Services is operated by Proxar Ltd. Certifications apply to the certified legal entity and the scope of its certificates. View accreditation information
Connect rules to their business purpose
We review rule order, source and destination scope, permitted services and the ownership of exceptions. Broad or unused entries receive attention. But they are not removed solely because a short observation period shows no traffic. Infrequent processing, recovery operations and supplier access may require investigation with their owners.
The report identifies shadowed rules, duplicated objects and unclear descriptions where these hinder reliable administration. The aim is a policy another engineer can understand during an incident. An audit that produces a long list of cosmetic changes while missing an unrestricted management path has not addressed the most important risk.
A useful starting point
Tell us what is happening.
A short description of the problem is enough for an initial discussion.
Examine NAT, routing and asymmetric paths
Address translation can alter the addresses that matter to a policy decision, and the applicable behaviour depends on the platform and setup. We review translations alongside access rules and routing rather than treating them as unrelated documents. Public service exposure is checked against the intended destination and the actual forwarding path.
Redundant links and multiple firewalls can introduce asymmetry. We identify whether traffic can bypass the expected inspection point or return through a device without the required state. The audit records these architectural issues even when individual rules look correct, because policy cannot protect a connection that never reaches the enforcement device.
Different environments. The same care.
Built around the work
your network supports.
Finance, banking and the wider private sector. We start with the systems and people that depend on your connections.
Finance & banking
Market-data paths, routing and provider coordination on clients’ behalf.
Financial-market services ↗Offices & multi-site teams
Reliable access between people, workplaces and business applications.
Office network design ↗Data centres & cloud
Network boundaries, workload connections and operational ownership.
Data centre networks ↗Review inspection features in context
Where intrusion prevention, app control, encrypted-traffic inspection or related capabilities are used, we examine their scope and operational treatment. Enabled features are not automatically effective for all traffic. We check how policies are chosen, which exceptions exist and how compatibility or performance constraints have been addressed.
Encrypted inspection requires particular care with trust, sensitive categories and data handling. We do not recommend blanket decryption without considering the customer's privacy and support needs. The audit distinguishes a deliberate exclusion with an approved reason from an accidental gap that arose during troubleshooting and was never revisited.
Protect management and administration
Firewall management can affect many vital services. We check admin rights, sign-in controls, reachable management ports and credentials used by tools or linked systems. Recovery access is part of the same review. It must have an owner and controls, even when it exists for use during an emergency.
We also check software support and the link between the manager and its devices. Versions, backups and upgrade steps matter: a mistake can remove protection or stop traffic. If a known weakness or unsupported release applies, the finding states which systems are affected. It also records the evidence needed to plan a suitable fix.
Check monitoring, resilience and change records
Useful logs should make significant access decisions and operational failures understandable without overwhelming the team. We assess collection, time synchronisation, retention and escalation for the agreed scope. A logging checkbox is not evidence that records are reaching the destination or being reviewed by someone who can act.
High availability is assessed according to the failure cases the customer expects it to cover. We examine setup consistency, state dependencies and the treatment of failover changes. Where direct testing is not authorised, the report distinguishes a design observation from checked recovery behaviour instead of presenting both as equivalent assurance.
Prioritise remediation and retest important findings
The deliverable groups findings by service impact and rollout dependency. It identifies changes that can be scheduled together and those that require app owners, providers or a maintenance window. Our Cisco firewall rule optimisation work can implement an agreed subset of policy improvements without silently expanding the audit into a production change project.
MCI can review a defined Cisco firewall estate or support a wider network assurance programme. We provide evidence and practical recommendations, not an automatic PCI DSS or ISO certification claim. Share the firewall roles, management arrangement and audit aim so the engagement can produce the decisions and records your organisation actually needs.
Technical references
- Secure Firewall Management Center system configuration — Cisco / Cisco Meraki
- Technical guide to information security testing and assessment — NIST
Talk to a specialist
Need a specialist view?
Tell us what is affected, what changed and what your team has already checked. A short outline is enough to start.
+44 203 196 6566Choose option 1
sales@proxar.co.ukUK-wide service.
Most of our engineers are based in Kent, with a focus on London, Sussex, Essex and Berkshire.
Existing customers should use their agreed support and escalation channels. This form is for service enquiries, not a monitored emergency ticket.
Tell us what you need.
A short outline is enough. Please do not include passwords or sensitive network details.
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