Applications

Log to a file with enough information to make it useful. CAUTION: there's no built in log rotatio...

(2018-10-16) Problem What is CAA record Solution CAA record is a DNS record that indicates who is...

(2016-05-09) Problem Show IPs getting denied responses to queries on my local DNS server, sorted ...

(12 October 2012) Problem: I need to delegate part of my /24 to another name server. Solution Thi...

dnstop is a tool for monitoring dns requests on a particular network. It is a libcap snooper, so ...

Problem You want to know what the current content of a DNS zone is. Possible Solution This will w...

(2019-09-11) I've only been doing this for 25 years, I guess it's high time I learned what it all...

Interesting: [dave@store01 ~]$ dig +trace xdroop.com ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-20.P1.el5_...

(2013-03-28) Problem I want to tell a BIND server that a particular DNS zone can be resolved at s...

(2022-09-07) Prevent the certificate warning page from popping up on subsequent initial connectio...

(2025-07-07) Go to chrome://net-internals/#hsts and put in the zone you want to forget attributes...

(2026-08-26) CVS uses tags. Rancid uses CVS. Using this in combination with frequent configuratio...

(Note from 2024: probably dangerously outdated) Customer Information (brains) : # export PATH=/op...

Lists the contents of the sasldb2 database. # sasldblistusers2 cyrus@gwx1: userPassword dave@gwx1...

This is the utility for creating, changing, and deleting users and passwords from the local sasl ...

Hi Dave Finally got the daemontools on netmon01 to supervise radiusd, and it should restart if th...

(2020-02-25) Problem The module command doesn't work in cron jobs. Solution You have to source th...

This also applies to situations with eXceed 8 where the screen saver engages, but never goes into...

Simple, in crontab: # /opt/sfw/bin/fetchmail -f /etc/fetchmailrc --syslog Interactively: # /opt/...

Excluding stuff (say, the .snapshot directory of a find) $ find $dir -name .snapshot -prune -o -t...

Name: vpn-Top-SSLVPN-Login-Failures-By-IP Log type: Event Query: SELECT remip, COUNT (eventt...

(2019-10-30) FortiCloud Debug Commands fgt300d-a (global) # di test app forticldd 1. dump fds set...

(2025-12-16) diag test deploymanager reloadconf <oid> You can get all the firewalls information ...

(2025-02-19) Command Does diag dvm device list list all devices diag dvm device list nam...

(2017-09-14) Squashing multiple commits into one: git log shows you the history: [dave@store02 an...

Problem I need to make a disk bigger Solution Resize the disk: $ gcloud compute disks list | grep...

Google expects you to use the "Directed Identity" feature to sign in with your Google account. En...

You may have been directed to this page by Dave's email signature, and because you noticed some k...

The server subkeys.pgp.net is the preferred keyserver (for various reasons expounded at length el...

(Note, 2024: man, the '90s were a long time ago, right?) You may find a starting point here: www...

Basically this boils down to the application being unable to exclusively lock the memory page bec...

GnuPrivacyGuard basics These are the bare-bones instructions to get you going. Reading the docume...

$ gpg --list-secret-keys $ gpg -a --export-secret-key [id]

Figure out what your cdrom drive's device is. For your own peace of mind, don't use SAM, becaus...

(2026-07-07) Problem I have a .ova file that I need to import into Hyper-V. Yadda yadda yadda, I ...

(2026-09-24) Problem The ManageEngine page includes spaces in the registry key names it wants you...

(2026-07-24) Problem: By default, Hyper-V VMs have NumLock disabled. If your workstation has NumL...

(2024-11-12) Most of the time I'm running iperf3 to understand the capability of a long distance ...

(14 August 2012) Available on rpmforge. Basic throughput testing, TCP: run the server # ipe...

(2023-10-31) DH Group to OAKLEY_GROUP values DH Oakley DH Group 1 768-bit MODP Group DH ...

(2026-10-02) ICMP ping scan: nmap -sn 192.168.1.0/24 Scan for a specific port: syn scan: nmap -...

(2026-09-24) Export the NPS Clients Get-NpsRadiusClient | ForEach-Object { Write-Output "New-...

(2026-05-14) $ ntttcp --help NTTTCP for Linux 1.4.0 ---------------------------------------------...

2023-06-30 About generating dhparams with 4096 bits instead of 2048 bits When you use dhparam, O...

(2019-01-21) Problem I have a long running ping and I want to see where we are without killing th...

(2026-09-23) rename 's/\.bak$//' *.bak

(2019-02-15) Problem Wordy config files that are all comments and whitespace. We want to see the ...

(2026-10-08) Version: 8.0.1 SSH to the esxi node esxcli system snmp get esxcli system snmp set -a...

You're gonna want to run these as the librenms user. Command list clients with snmp versi...