Built to fit
Network design & optimisation
Architectures tailored to your business rather than a reference diagram — one size does not fit all, and an over-engineered network costs as much as an under-built one.
Design · defend · monitor
Network and firewall services
Network architecture built around your business, firewalls that are actively managed rather than installed and forgotten, and round-the-clock monitoring so stability does not depend on someone noticing.
What we do
Design it properly, then defend it continuously
A network is only as good as the day it was last reviewed. We build architectures that fit the business and keep the edge defended as the threat landscape moves.
Rules kept clean
Firewall configuration & management
Firewall solutions implemented and then actually managed — rule sets reviewed, changes documented, and drift caught before it becomes an opening.
Tuned, not noisy
Intrusion detection & prevention
Identify and stop threats at the perimeter with IDS and IPS tuned to your traffic, so alerts mean something and staff do not learn to ignore them.
Site-to-site & remote
VPN & remote access
Securely connect remote offices and give staff safe access from anywhere, without turning the VPN concentrator into the thing that takes the business offline.
Before you buy bandwidth
Traffic analysis & optimisation
Find what is actually consuming the link, shape it, and give users back the responsiveness they lost — usually cheaper than buying more bandwidth.
Around the clock
24/7 monitoring & support
Our commitment does not end at implementation. Continuous monitoring and round-the-clock support keep the network stable while you run the business.
See managed IT plans ›Vendors
Hardware and platforms we work across
Multi-vendor by design. We are not reselling a single stack, so the recommendation follows your requirements and your existing estate.
Firewalls & security
- Fortinet
- Palo Alto Networks
- Check Point
- Sophos
- Cisco ASA & Firepower
- F5
Network infrastructure
- Cisco
- Juniper
- NETGEAR
- Dell
- Switching & routing
- WiFi & controllers
Cloud networking
- Azure Firewall
- AWS security groups
- OCI network security
- VPC, VNets & transit gateways
- Load balancers & WAF
Common requests
What you can engage us for
Scheduled project work and the urgent things that arrive without warning — both are covered.
- Install, configure and support network and firewall infrastructure
- Design enterprise network security
- Develop and implement firewall rule requirements
- Perform maintenance and changes on firewalls and network devices
- Troubleshoot and resolve network connectivity issues
- Investigate and respond to network security incidents
- Request an estimate for upcoming project work
Why Onsys
Why businesses trust us with the perimeter
Tailored architecture
One size does not fit all. Network architecture is aligned to your requirements and optimised for the traffic you actually carry.
Security first
Modern firewall solutions that shield the network from evolving threats and keep digital assets fortified against unauthorised access.
Scalable
The Australian business landscape is dynamic. Services scale with growth without compromising security or performance.
Always monitored
Continuous monitoring and round-the-clock support, so stability does not depend on someone noticing.
Is your firewall rule set still the one you inherited?
Most are. Book a free call and we will review where your network and perimeter stand, and what is worth fixing first.
Book a Network ReviewPublished Last reviewed
FAQ
Common questions
Network and firewall support is $150 per hour with a four-hour minimum, GST exclusive. Ongoing management is included in managed IT plans from $4,500 per month, and defined projects such as a firewall replacement are quoted as a fixed price.
Fortinet, Palo Alto Networks, Check Point, Sophos, Cisco ASA and Firepower, and F5. On the network side we work across Cisco, Juniper, NETGEAR and Dell, plus cloud-native controls including Azure Firewall, AWS security groups and OCI network security.
Yes, and it is one of the most common first engagements. Rule sets accumulate over years, and most organisations are running rules nobody can explain. A review identifies what is redundant, what is too permissive and what should be documented.
Yes. Continuous monitoring with alerting is available as a standalone engagement or as part of a managed IT plan, so problems are detected rather than reported by users the next morning.
Yes. Troubleshooting and responding to network security incidents is one of the request types clients engage us for. For anything affecting production right now, call 1800 431 416 rather than emailing.
Yes — site-to-site VPN connecting remote offices and remote-access VPN for staff, designed so the concentrator does not itself become a single point of failure for the business.
No. We are multi-vendor by design and not reselling a single stack, so the recommendation follows your requirements, your existing estate and your budget rather than a partner target.
Yes. Requesting an estimate for upcoming project work is a standard engagement — we will scope it, tell you what it involves and quote it as a fixed price where the scope can be defined.