Connect. Secure. Manage.
Cisco Intrusion Prevention Tuning
Tune Cisco firewall intrusion prevention around actual services, balancing inspection coverage, false positives and supported performance.
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.
Cisco intrusion prevention tuning adjusts supported IPS rules to the systems and traffic they protect. We review disruptive alerts and exceptions while keeping useful detection and blocking in place. Each change needs a clear reason. The aim is an effective response to relevant threats, rather than reducing the alert count for its own sake.
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.
Identify the protected services
We start with the apps, operating setups and traffic paths covered by the inspection policy. A public web service, an internal business app and a specialist operational network can require different treatment. The customer identifies critical transactions, maintenance constraints and any systems that cannot safely be exercised during testing.
The assessment also establishes visibility. Encrypted traffic, unsupported protocols or a path that bypasses the sensor may limit what the IPS can inspect. We document those limits instead of treating the absence of an alert as proof that no threat exists. Any proposal for extra decryption or traffic redirection is a separate design decision with its own implications.
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
Review the current policy and event pattern
We examine the chosen policy, enabled rules, update state and the actions being applied. Event trends help identify recurring false positives, noisy signatures and possible genuine attacks. We compare events with app behaviour and relevant logs rather than deciding from an alert title alone.
An event labelled severe is not automatically a confirmed compromise, and a low-volume event is not automatically unimportant. We assess context, affected assets and the evidence available. Where investigation beyond tuning is required, the issue is escalated through the customer's incident process rather than buried in a recommendation to disable the rule.
A useful starting point
Not sure where to start?
Bring the requirement. We will help you define the engineering work.
Diagnose false positives without broad bypasses
When a legitimate app is disrupted, we identify the specific traffic, rule and inspection condition involved. A targeted exception may be appropriate, but its source, destination, service and duration should reflect the actual problem. Disabling a whole policy or excluding an entire network is not the default response to one troublesome transaction.
We test the proposed adjustment against representative legitimate traffic and, where authorised, a suitable validation case for the intended protection. The goal is to show that the exception restores the required service without removing unrelated enforcement. Any residual exposure is explained to the customer so that acceptance is a conscious decision rather than an accidental consequence of troubleshooting.
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 ↗Consider capacity and processing effects
Inspection features consume resources, and the effect depends on traffic mix and platform capability. We review device health, connection behaviour and relevant counters alongside the policy. A performance complaint should not automatically be solved by switching off security controls when the underlying issue may be sizing, a software defect or an unrelated network bottleneck.
The design is checked in the degraded state where high availability is expected. A surviving device must carry the required workload with the agreed inspection enabled. We document any capacity limitation and the options for addressing it, distinguishing measured results from vendor headline figures or assumptions about future traffic.
Introduce changes with evidence and rollback
Tuning is performed through an approved change sequence. We retain the previous policy, state the reason for each adjustment and define the observation period. Changes affecting important apps are coordinated with their owners so that a successful rollout message is followed by a meaningful service test.
We avoid changing many unrelated controls simultaneously. That makes it harder to explain an improvement or a new fault. The resulting record should show which adjustment changed which outcome, with a practical route back if the app or security effect differs from expectations.
Keep updates and exceptions under review
Threat rules and app behaviour change over time. An exception justified for one release may become unnecessary after a vendor fix, while a newly introduced service may need extra inspection. We establish ownership of updates and a process for reviewing their effect on the customer's setup.
Exceptions are recorded with a purpose, approver and review point. They are not treated as permanent merely because they solved an incident. The operations team receives guidance on distinguishing expected policy noise from a condition requiring investigation, and on escalating evidence without exposing unnecessary packet contents or credentials.
Define the tuning outcome
MCI provides a policy-change record, evidence for retained exceptions, app test results and remaining visibility limits. This service can sit alongside Cisco Secure Firewall management or a focused incident review. It does not replace incident response, endpoint protection or a broader security programme. It improves the quality of a specific network inspection control and the way the customer operates it.
Technical references
- Secure Firewall deployment overview — Cisco / Cisco Meraki
- Cisco Secure Firewall 10.0 feature documentation — Cisco / Cisco Meraki
Talk to a specialist
What does your network need next?
Tell us what you are planning, changing or trying to improve. We will help define a practical next step and the engineering scope.
+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.
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