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List all sender, receiver addresses for successful relay IPs
(2024-11-22) mkdir tmp.$$ cd tmp.$$ for z in /var/log/maillog ; do for i in `grep stat= $z | aw...
mrrogers
(2014-07-17) MrRogers knows who is in your neighbourhood. mrrogers is a perl script which uses sn...
Bulk Check IPs Against List Of Subnets
(2024-11-15) Problem You have a logfile full of IP addresses and you need to figure out if they b...
getarp
A perl script to get the ARP table out of a router. Requires Net::SNMP, Net::hostent, and Sys::Sy...
TCP Tuning for 10G
(2024-11-12) This page contains a quick reference guide for Linux tuning for Data Transfer hosts ...
TCP Tuning for iperf3
(2024-06-03) Found this set of recommendations for TCP tuning while chasing some iperf3 issues re...
Unifi Controller
Installing Unifi Controller on Docker on CentOS 8 (or probably any docker installation at this po...
Find Tricks
Excluding stuff (say, the .snapshot directory of a find) $ find $dir -name .snapshot -prune -o -t...
Chrome Certificate Warning Bypass
(2022-09-07) Prevent the certificate warning page from popping up on subsequent initial connectio...
Mounting CD-ROMs
Figure out what your cdrom drive's device is. For your own peace of mind, don't use SAM, becaus...
Quick Start
GnuPrivacyGuard basics These are the bare-bones instructions to get you going. Reading the docume...
GPG-aware mail clients and plugins
(Note, 2024: man, the '90s were a long time ago, right?) You may find a starting point here: www...
GPG Key Server Operations
The server subkeys.pgp.net is the preferred keyserver (for various reasons expounded at length el...
insecure memory
Basically this boils down to the application being unable to exclusively lock the memory page bec...
About GPG
You may have been directed to this page by Dave's email signature, and because you noticed some k...
makeinfo build error
2013-05-15 Problem Building gcc 4.1.2 on CentOS 6 halts with the error: WARNING: `makeinfo' is mi...
DHCP Reservation Not Working
A: dhclient now supports RFC-4361! (Please note that this is an answer to a question nobody asked...
Upgrading Fedora
(2019-03-18) Problem I want to update Fedora to another version. In General It is recommended to ...
Set Hostname To VM Name
(2019-11-28) Problem /t Solution For whatever reason, the vmware-tools package (and the open-vm-t...
Samba AD Controller Notes
(2019-11-25) Backplot At a new customer site, I inherited a Active Domain that was hosted on a Sa...