pjhtech ToolsMikroTik Port Forward Works Externally but Fails from LAN
Fix same-subnet hairpin NAT with a LAN destination rule and a scoped return-path translation; check external forwarding separately.
Practical guideMikroTik RouterOS Guides
Configure and troubleshoot RouterOS routing, NAT, firewalls, VLANs, Wi-Fi and LTE/5G connections.
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Troubleshooting / Common problems
MikroTik Bridge VLAN Filtering Without Losing Management
Stage RouterOS bridge VLANs and diagnose a management lockout: CPU-port membership, PVID, tagged uplinks, input policy and Safe Mode recovery.
Practical guideMikroTik FastTrack Bypasses Queues or Policy Routing
Diagnose simple queues that do not limit traffic, missing packet marks and connections taking the wrong WAN when FastTrack is enabled.
Practical guideMikroTik WireGuard Handshake but No Traffic
Trace allowed-address, routes, input versus forward rules and the return path when a RouterOS WireGuard peer handshakes but cannot reach the remote LAN.
Practical guideMikroTik DNS Works on the Router but Not on Clients
Check DHCP-advertised DNS, allow-remote-requests, TCP and UDP 53, static records and application DNS when RouterOS resolves names but LAN clients fail.
Practical guideMikroTik WireGuard Stops After a Mobile IP Change
Compare endpoint-address and current-endpoint-address, NAT keepalive and responder roles after an LTE/5G or roaming endpoint changes.
Practical guideMikroTik “DoH server connection error”: DNS over HTTPS Checks
Diagnose resolving error, SSL errors and connection reset by peer using DoH bootstrap DNS, endpoint compatibility and certificate validation.
Practical guideMikroTik “failure: not allowed by device-mode”
Find the device-mode setting for the refused RouterOS tool, then enable the sniffer with physical confirmation. Handle flagged configuration separately.
Practical guideMikroTik WireGuard Import: “Could not parse”
Fix a RouterOS WireGuard import rejected because the configuration file begins with a comment.
Practical guideConfiguration & CLI guides
MikroTik RouterOS 7 Basic Internet Setup
Build a wired WAN-to-LAN setup with DHCP, a bridge, DNS, masquerade and explicit firewall protection.
Practical guideMikroTik RouterOS 7 Firewall Basics
Allow LAN Internet access, restrict SSH and WinBox to one administrator, and apply separate IPv4 and IPv6 firewall rules.
Practical guideMikroTik WiFi Command Not Found: wifi or wireless?
Fix commands copied for the wrong wireless driver and set a supported channel width in the correct RouterOS menu.
Practical guideMikroTik LTE/5G: Choose or Clear a Band, Cell or Operator Lock
Choose the correct LTE/5G restriction and undo a band, cell or operator lock without confusing the three settings.
Practical guideMikroTik LTE & 5G NR Band Locking
Select or restore LTE and NR bands with supported RouterOS properties while accounting for carrier aggregation and NSA anchors.
Practical guideMikroTik LTE: Find EARFCN and Cell ID for a Cell Lock
Read the serving LTE cell, scan supported modems and collect the EARFCN/PCI pair needed for cell locking.
Practical guideMikroTik LTE Cell Lock: Modem-Specific Commands
Choose the documented LTE cell-lock family, query supported locks and understand reset, handover and carrier-aggregation limits.
Practical guideMikroTik 5G SA Cell Lock: Support & Limits
Lock a supported modem to a measured 5G SA cell, query or clear the lock, and avoid applying it to an NSA connection.
Practical guideMikroTik LTE / 5G Troubleshooting
Fix an ignored manual APN on an MBIM modem, restore registration after a bad lock, or separate LTE service from LAN forwarding.
Practical guideMikroTik Common Problems and Fixes
Find the fix for client DNS, hairpin NAT, lost VLAN management, FastTrack, WireGuard, LTE APN and device-mode errors.
Practical guideMikroTik Hardware Offload Missing or Firewall Rules Bypassed
Check model and port-group limits when H is missing, routing loads the CPU, or full L3 hardware offload bypasses firewall rules.
Practical guideMikroTik DHCP Relay Uses the Wrong Source IP
Use local-address-as-src-ip on RouterOS 7.17+ when the DHCP server path expects the relay address instead of the transit source.
Practical guideTools & references
MikroTik RouterOS WiFi Band Quick Reference
One A4 page of current /interface/wifi band selectors, package distinctions and channel-width syntax.
A4 referenceMikroTik LTE & 5G Band Quick Reference
One A4 field reference for selected European-relevant LTE and NR bands, duplex modes, frequency ranges and RouterOS selectors.
A4 referenceRouterOS inspection commands
Use the RouterOS command references to collect interface, bridge, route, firewall and protocol evidence. Read the output alongside the relevant troubleshooting guide, with RouterOS v7 and hardware differences kept explicit.
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