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Real Network Fixes
Plain-English fixes for internet and network problems
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Network Connectivity
Internet Not Working
2
Slow Internet Speed
2
Intermittent Connectivity
2
Packet Loss
1
DNS Problems
2
DHCP Problems
1
IP Address Conflicts
1
Network Latency
1
Switches and Routers
Cisco Switch Problems
1
VLAN Configuration Issues
1
Router Connectivity
1
Switch Port Troubleshooting
1
Routing Problems
1
PoE Failures
1
Firewall Troubleshooting
Fortinet Issues
1
SonicWall Issues
1
Cisco Firewall Issues
1
Firewall Rules and NAT
1
VPN Connectivity
1
Firewall Migration
1
Wi-Fi and Wireless
Wi-Fi Disconnecting
1
Access Point Offline
1
Weak Wireless Signal
1
Wi-Fi Heatmap and Coverage
1
Wireless Interference
1
Meraki Access Point Issues
1
Fiber Optic and Cabling
Fiber Link Down
1
Fiber High Loss
1
OTDR Troubleshooting
1
SFP Compatibility
1
Single-Mode and Multimode Fiber
1
Cat5e/Cat6 Problems
2
Ethernet Termination
1
ISP and WAN
ONT Troubleshooting
1
ISP Circuit Down
1
WAN Failover
1
Slow Gigabit Internet
2
Circuit Turn-Up
1
Demarcation Issues
1
Real Field Troubleshooting Cases
Recently Resolved Network Issues
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Step-by-Step Repair Procedures
1
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Demarcation Issues
Demarcation Issues
ISP and WAN Troubleshooting: Circuit Down, ONT Lights, Failover and Slow Gigabit
Section guide
How to tell if an internet problem is yours or your provider’s: ONT lights, the bypass test, WAN failover, slow gigabit speeds, circuit turn-up and demarc issues.
Before you change anything
Save the current device configuration and note what you change, so you can roll back.