Navijin community
Networking & security tutorials
Step-by-step guides written by Navijin engineers for IT teams, integrators and students. Configure VLANs and routing, secure Wi-Fi and switches, set up CCTV, monitor your network and bring fibre online. 47 tutorials and growing.
Tutorials
Switching
How to Configure VLANs on a Managed Switch
Separate staff, guests, voice and cameras into their own VLANs: create VLANs, set access and trunk ports, and verify traffic separation.
Start tutorial →Intermediate · 15 minHow to Set Up Inter-VLAN Routing on a Layer 3 Switch
Route between VLANs at wire speed using switch virtual interfaces (SVIs), a DHCP relay and ACLs that control which networks can talk.
Start tutorial →Intermediate · 10 minHow to Configure Link Aggregation (LACP) Between Switches
Bundle two or more links into one logical link for more bandwidth and redundancy using IEEE 802.3ad LACP.
Start tutorial →Beginner · 10 minHow to Prevent Network Loops With Spanning Tree (RSTP)
Stop broadcast storms caused by loops: enable RSTP, choose the root bridge, and protect edge ports with BPDU guard.
Start tutorial →Advanced · 18 minHow to Build an ERPS Ring for Fast Failover
Configure ITU-T G.8032 ERPS on industrial switches so a fibre cut reroutes traffic in milliseconds.
Start tutorial →Intermediate · 8 minHow to Use Port Mirroring to Troubleshoot Network Problems
Copy traffic from a port or VLAN to an analyser port and capture it with Wireshark.
Start tutorial →Intermediate · 12 minHow to Configure a Voice VLAN and QoS for IP Phones
Give IP phones their own VLAN and priority so calls stay clear even when the network is busy.
Start tutorial →Advanced · 25 minHow to Configure OSPF Dynamic Routing Between Layer 3 Switches
Replace dozens of static routes with OSPF: plan areas and router IDs, advertise networks, secure neighbours with authentication, tune timers and verify convergence.
Start tutorial →Intermediate · 15 minHow to Stack Switches for Simpler Management and Resilience
Combine several stackable switches into one logical switch: cabling, member priorities, cross-stack link aggregation and safe upgrades.
Start tutorial →Intermediate · 15 minHow to Build an Outdoor Industrial Network Cabinet
Design a reliable street or field cabinet: enclosure, DIN-rail switch, 48 V power supply, surge protection, fibre and labelling.
Start tutorial →Tutorials
PoE
How to Use PoE Scheduling and Remote Power-Cycling
Save energy by switching PoE off outside business hours, and reboot a frozen camera or access point remotely.
Start tutorial →Beginner · 12 minHow to Troubleshoot PoE Devices That Won't Power Up or Keep Rebooting
A systematic checklist for cameras and access points that stay dark, flicker or reboot at night.
Start tutorial →Tutorials
Wi-Fi
How to Set Up Secure Guest Wi-Fi With Client Isolation
Give visitors Internet access without exposing your internal network: separate SSID and VLAN, client isolation, bandwidth limits and an optional captive portal.
Start tutorial →Intermediate · 12 minHow to Plan Wi-Fi Channels on 2.4, 5 and 6 GHz
Reduce interference and increase capacity by choosing the right channels and widths for each band.
Start tutorial →Advanced · 20 minHow to Secure Wi-Fi With WPA3-Enterprise and RADIUS
Replace shared Wi-Fi passwords with per-user authentication using 802.1X, a RADIUS server and WPA3-Enterprise (or WPA2-Enterprise for older devices).
Start tutorial →Intermediate · 8 minHow to Improve Wi-Fi Roaming With 802.11k and 802.11v
Help phones, laptops and scanners move smoothly between access points without dropping calls.
Start tutorial →Intermediate · 12 minHow to Install and Align a Point-to-Point Wireless Bridge
Mount, align and secure a 5.8 GHz bridge between two buildings for a stable high-speed link.
Start tutorial →Intermediate · 25 minHow to Do a Wi-Fi Site Survey Step by Step
Plan, measure and validate Wi-Fi coverage and capacity: predictive design, on-site AP-on-a-stick survey, post-installation validation and a clear report.
Start tutorial →Beginner · 12 minHow to Set Up Mesh Wi-Fi for a Small Office or Home
Cover a villa, shop or small office with mesh routers: placement, wired backhaul where possible, secure settings and a separate guest network.
Start tutorial →Advanced · 30 minHow to Design and Deploy Hotel Wi-Fi Room by Room
A complete hotel Wi-Fi project: requirements, in-room vs corridor design, VLANs for guests, staff, POS and IoT, PoE switching, portal and handover.
Start tutorial →Tutorials
Security
How to Enable 802.1X Port Authentication on Switches
Stop unknown devices from using your network ports: configure 802.1X with RADIUS and MAC-authentication bypass for printers and cameras.
Start tutorial →Beginner · 10 minHow to Secure the Management of Switches, Routers and Access Points
A hardening checklist for every network device: strong credentials, SSH only, a management VLAN, access lists and logging.
Start tutorial →Intermediate · 14 minHow to Segment IoT and CCTV Devices From Your Main Network
Put cameras, smart TVs, sensors and building systems in their own VLANs so one compromised device cannot reach your business systems.
Start tutorial →Intermediate · 14 minHow to Write Firewall Rules That Actually Protect You
Default-deny, least privilege and clean rule bases: practical rules for any firewall or gateway.
Start tutorial →Advanced · 18 minHow to Connect Two Offices With a Site-to-Site IPsec VPN
Link branch and head office securely over the Internet: plan subnets, match IKE and IPsec settings, and route traffic through the tunnel.
Start tutorial →Beginner · 6 minHow to Protect Admin Accounts With Two-Factor Authentication
Turn on 2FA for cloud portals, VPNs and device management so a stolen password is not enough.
Start tutorial →Beginner · 10 minHow to Upgrade Network Device Firmware Safely
Patch switches, gateways, access points and cameras without outages: check release notes, back up, upgrade in a window and verify.
Start tutorial →Advanced · 12 minHow to Stop Rogue DHCP Servers and ARP Spoofing
Protect users from fake gateways and man-in-the-middle attacks with DHCP snooping and dynamic ARP inspection.
Start tutorial →Intermediate · 15 minHow to Lock Down Switch Ports With Port Security and Storm Control
Limit MAC addresses per port, block unauthorised devices, stop broadcast storms and disable unused ports: a practical access-layer hardening guide.
Start tutorial →Intermediate · 18 minHow to Set Up Remote-Access VPN for Staff
Give employees secure access to office systems from anywhere with an IPsec or SSL client VPN, per-user accounts, 2FA and least-privilege rules.
Start tutorial →Advanced · 18 minHow to Protect Backups From Ransomware With Network Design
Ransomware targets backups first. Isolate backup systems, restrict access paths and keep immutable or offline copies.
Start tutorial →Tutorials
Video Surveillance
How to Set Up IP Cameras With a PoE Switch and NVR
From unboxing to recording: plan IP addresses, power cameras with PoE, add them to the NVR and set recording and retention.
Start tutorial →Intermediate · 10 minHow to Access CCTV Remotely Without Port Forwarding
Port-forwarding an NVR to the Internet invites attacks. Use a VPN instead and keep cameras invisible from outside.
Start tutorial →Intermediate · 15 minHow to Configure NVR Storage, RAID and Retention
Install surveillance drives, choose RAID, set recording quotas and confirm you keep footage for the required number of days.
Start tutorial →Intermediate · 12 minHow to Configure PTZ Camera Presets, Patrols and Auto-Tracking
Make PTZ cameras work for you: save presets, build patrol tours, set park positions and use smart tracking where supported.
Start tutorial →Tutorials
Routing & Internet
How to Set Up Dual-WAN Failover With a 4G LTE Backup
Keep a branch online when the fibre fails: add a 4G LTE link as a backup WAN with health checks and automatic failover.
Start tutorial →Beginner · 12 minHow to Plan IP Addressing and Subnets for a Business Network
A clean IP plan makes networks easier to secure, troubleshoot and grow. Learn a simple scheme you can reuse on every site.
Start tutorial →Beginner · 15 minHow to Configure DHCP Scopes, Reservations and Options
Hand out addresses reliably: one scope per VLAN, reservations for printers and cameras, the right DNS and gateway options and sensible lease times.
Start tutorial →Intermediate · 12 minHow to Use NAT and Port Forwarding Safely
Understand source NAT, destination NAT and port forwarding, when to use them, and how to publish a service without exposing your network.
Start tutorial →Intermediate · 15 minHow to Provision SIP IP Phones on an IP PBX
Register desk phones to your IP PBX or hosted voice service: accounts, codecs, voice VLAN, auto-provisioning and testing.
Start tutorial →Advanced · 20 minHow to Start With IPv6 on a Business Network
A practical first step to IPv6: understand addressing, enable dual-stack on the edge and one VLAN, secure it and test.
Start tutorial →Tutorials
Monitoring
How to Monitor Your Network With SNMP and Syslog
Know about failures before users call: collect interface statistics with SNMPv3 and central logs with syslog.
Start tutorial →Beginner · 5 minHow to Synchronise Time on Network Devices With NTP
Accurate clocks are essential for logs, certificates, schedules and CCTV evidence. Configure NTP everywhere in minutes.
Start tutorial →Beginner · 8 minHow to Back Up and Restore Network Device Configurations
A configuration backup turns a failed device into a quick swap. Set up regular backups and test a restore.
Start tutorial →Beginner · 10 minHow Zero-Touch Provisioning Works With Navijin Cloud
Ship devices straight to site and let them configure themselves: claim by serial number, assign to a site, connect and verify.
Start tutorial →Tutorials
Fibre & GPON
How to Provision ONUs on a GPON OLT
Bring a new subscriber or building online: discover the ONU, authorise it, apply a bandwidth profile and map services to VLANs.
Start tutorial →Intermediate · 10 minHow to Measure Optical Power and Check a Fibre Link Budget
Use an optical power meter and the device's DDM readings to confirm fibre links are healthy and within budget.
Start tutorial →Need help with your own network?
Navijin engineers and partners can design, configure and support your project.