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Disable IPv6 in Ubuntu LTS 26
(2026-07-21) Problem: Ubuntu is defaulting to trying ipv6 to find things and you don't have an ip...
Basic SD-WAN for 7.4.x
(2026-04-08) What This Is About (This is a refinement of my previous sdwan writings.) In the cour...
Powershell: Test Network Connection
(2026-03-05) > tnc www.google.ca -Port 443 ComputerName : www.google.ca RemoteAddress : ...
Powershell: Fetch Web Page
(2026-03-05) > Invoke-WebRequest -UseBasicParsing -Uri "https://wiki.xdroop.com" StatusCode ...
MAC forwarding table
(2026-02-23) v7.6.2 di switch mac-address list Filtering: di switch mac-address filter vlan-map ...
Fortigate Can't Connect To Fortimanager
(2026-02-18) Problem: Fortigate shows as "down" in Fortimanager, but isn't. Most of the time said...
Open sniffer output in Wireshark
(2026-01-21) You need: wireshark fgt2eth.exe Take your capture using verbosity level 6: diagnos...
Packet Capture
(2026-01-26) v7.2.10 Creating the capture profile config system sniffer-profile edit <profile...
Device-Local Certificate Expired
(2024-02-08) Problem The local, internally generated certificate that the Fortigate presents for ...
Packet Capture
(2013-07-18) Show information of packets seen on an interface: # diag sniffer packet internal non...
Using SNMP to trigger a configuration copy
(2025-11-27) MIB: https://mibs.observium.org/mib/CISCO-CONFIG-COPY-MIB/ (just in case I find the ...
Commands
VPN information show vpn-sessiondb l2l show crypto isakmp sa show crypto ipsec sa Diagnostics mo...
Port-Group
(2025-11-03) Physical ports are collected into groups called port-groups. All ports in a port-gro...
Troubleshoot IPsec VPN Tunnels, Packet size related
(2024-11-13) To confirm errors are increasing on IPsec VPN interface(s), periodically issue one o...
TCP Global Parameters
(2025-10-28) Show Windows TCP Parameters: C:\Windows\System32>netsh int tcp sho glo Querying acti...
Debug SSLVPN Authentication Issues
(20215-07-25) diagnose debug reset diagnose debug application sslvpn -1 diagnose debug applicatio...
iPerf3 on Fortigates
(2021-06-16) Limited iPerf3 on Fortigates # diag traffictest client-intf port1 <----- Defi...
Fortiguard Communication
(2025-09-04) Current authoritative vendor guide is here: https://community.fortinet.com/t5/FortiG...
Strip comments and blank lines from file
(2019-02-15) Problem Wordy config files that are all comments and whitespace. We want to see the ...
I Like Cookie Monster
(2005/2006 era) Alex is at the age where Sesame Street is a frequent, if not regular, visitor to ...