Intro: Sometimes one has a lot of ‘V6’ rules that need to be deleted. UFW does allow to delete the rules but only one by one, which can be time consuming. Here is a short bash script that does the trick of deleting them. IMPORTANT NOTE: In order for this script to work as desired …
Author: admin
Installing SNMP in Ubuntu 18.04
Here are the simple steps to install SNMP in Ubuntu 18.04 Reference: https://support.auvik.com/hc/en-us/articles/204221884-How-to-enable-SNMP-on-Linux-based-servers-workstations Next, using your text editor, edit /etc/snmp/snmpd.conf to look like this: # this will make snmpd listen on all interfaces # Or make it listen only to the local private network interface eg. eth0(192.168.100.3) # a read only community ‘local’ and the …
Turn OFF/ON Mac Synaptic Trackpad in Linux Mint 19.3
If you are annoyed by the accidental touch on the MacBook (Pro) Touchpad and want to turn it off here is what you can do: Create 2 launchers on your desktop which when double clicked turns the Trackpad ON or OFF. Here are the commands: First you need to make sure the following package is …
Linux Mint 19.3 disabling the menu pop on Mac ‘Left Command’ Press
Introduction: After having installed Linux Mint 19.3 on an old MacBook Pro, I wanted to disable the Menu pop-up function on the ‘Left Command’ key press. Solution: Delete the following entry in the Settings Editor(in the settings menu): xfce4-keyboard-shortcuts –>> /commands/custom/Super_L | xfce4-popup-wiskermenu Calveat: First I could not delete the command. Then I simply deleted …
Linux Mint 19.3 on MacBook Pro: Set F1-F12 as default function without pressing ‘Fn’
Inroduction: After having installed Linux Mint 19.3 on an old MacBook Pro I wanted to be able to use the function keys without having to press on the ‘Fn’ key Here is the answer: Reference: https://www.reddit.com/r/linuxmint/comments/4cecsz/set_f1f12_as_default_function_without_pressing_fn/ Solution: You can run a simple command to change the behavior. Therefore to get what I wanted the command …
Adding a title to SSH login terminal TAB
Introduction: Reference: https://unix.stackexchange.com/questions/177572/how-to-rename-terminal-tab-title-in-gnome-terminal Each terminal emulator has its own way of configuring a TAB title name for an SSH connection. To make sure it works for all well behaving terminal emulators, you can force the Title via an escape sequence set in the destination server. Howto: Login to a server via SSH and ad one …
Bypass the Docker –iptables limitations
Introduction: By default Docker daemon(dockerd) starts in an ‘open’ mode where all the advertised ports from docker are open for access from internet NO MATTER if the Linux system has a firewall that limits the access. That is because dockerd does give access to the ports at a lower level which ignored any firewall. In …
Using Postfix to deliver mail using SMTP Authentication
Reference: https://www.linode.com/docs/email/postfix/postfix-smtp-debian7/ Open or create the /etc/postfix/sasl_passwd file, using your favorite text editor: Add your destination (SMTP Host), username, and password in the following format: If you want to specify a non-default TCP Port (such as 587), then use the following format: Create the hash db file for Postfix by running the postmap command: If …
Create a simple and general access Samba share
apt-get install samba smbclient cifs-utils heimdal-clients mcedit /etc/samba/smb.conf Here we will create one share as read only from guests users and one share as read/write for a specific user Create read only Share [Photos] comment = “Family Photos” path = /media/NextCloud/Photos browseable = yes read only = yes guest ok = yes Create the read/Write …
APT ‘Not Found [IP: 2001:67c:1562::15’
Reference: https://ubuntuforums.org/showthread.php?t=2282646 If you encounter such errors of fetching packages with apt/apt-get: E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/u/ubuntu-release-upgrader/python3-distupgrade_18.04.36_all.deb 404 Not Found [IP: 91.189.88.142 80] E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/u/ubuntu-release-upgrader/ubuntu-release-upgrader-core_18.04.36_all.deb 404 Not Found [IP: 91.189.88.142 80] E: Unable to fetch some archives, maybe run apt-get update or try with –fix-missing? Then do the following to give precedence …
Using UFW as IP Blacklist
Introduction: There are instances where a service provider is taking care of the Firewall which is working between Internet and the rented server. In this case only certain standard ports will be made available to access the rented server. But what if you need a general use ‘blacklist’ firewall that will filter out abusive traffic …
Changing DNS resolving entries in Systemd controlled systems
References: https://unix.stackexchange.com/questions/442598/how-to-configure-systemd-resolved-and-systemd-networkd-to-use-local-dns-server-f Make sure the resolvconf package is deinstalled. This resolvconf package is useful for ‘on-the-road’ Laptops but is an overkill and can create problems in Servers.apt-get remove resolvconfreboot Edit the systemd controlled resolved.conf mcedit /etc/systemd/resolved.conf [Resolve]DNS= 8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844FallbackDNS=Domains=itmatrix.eu srv#LLMNR=no#MulticastDNS=no#DNSSEC=no#Cache=yes#DNSStubListener=yes Update systemd to the new edited resolved.conf systemctl daemon-reloadsystemctl restart systemd-networkdsystemctl restart systemd-resolved
Gmail problem with Thunderbird
The authentication problem encountered when creating a new Gmail account in Thunderbird can be solved as follows:Reference: https://support.google.com/mail/thread/4528103?hl=en 1. Set Thunderbird in safe mode https://support.mozilla.org/en-US/kb/safe-mode-thunderbird If Thunderbird is not running: Start Thunderbird in Safe Mode by holding down the option key while starting the application.If Thunderbird is already running: At the top of the Thunderbird …
Installing Anydesk in Debian/Ubuntu
Resetting a user Password in OSX
This is a Hack that is quite dangerous if you have lost your Mac and someone is trying to use your account and its content. On the other hand it is very useful if you have forgotten your password.Important Note: If your Mac OSX password is tied to the Apple iCloud account then this trick …
Installing BearExtender for Mac on Mac OSX 10.11(El Capitan)
These instructions are a mix of what I got from: https://blog.alfa.com.tw/2016/03/01/using-alfa-network-awus036nh-awus036neh-awus036nf-awus051nh-v2-awus052nh-on-osx-10-11-el-capitan/ https://www.bearifi.com/pages/bearextender-1200-support Run the following instructions: Create a new directory for the downloads mkdir ~/BearExtender Put the following download in the directory called ~/BearExtender Download the BearExtender Kernel Extension from here: http://107.170.140.210/s/8aa1Wf38QGi7R7v Get the BearExtender software Put the following download in the directory called ~/BearExtender …
Disabling Apple SIP Protection
Introduction: SIP protection defined by Apple as “technology in OS X El Capitan and later that’s designed to help prevent potentially malicious software from modifying protected files and folders.” It locks down the system extensions folder which makes it so driver applications like ours cannot write to that folder unless you disable SIP protection. For …
Decrypting Jotform encrypted CVS Files
Description:When the encryption is been activated for the JotForms, exports of the forms in CSV format are saved with almost all fields in RSA encrypted format. This script below allows to decrypt such CSV files. Problem:Since the private key is only saved at the JotForm user’s side, the JotForm server has no way of decrypting …
FTPS on command line using LFTP
# In Debian/Ubuntu, install LFTPapt-get install lftp # Create the configuration file in home directory of the user# eg. admin user will be running the program: cd /home/admintouch .lftprc (Content)set ftp:ssl-auth TLSset ftp:ssl-force trueset ftp:ssl-protect-list yesset ftp:ssl-protect-data yesset ftp:ssl-protect-fxp yesset ssl:verify-certificate no Command line to upload 2 files: software.txt and software2.txt cd /DATA/files/lftp user:PASSWORD@servername <<EOFput …
Working with UFW and Docker
Introduction: I’m not really sure how well this DANGEROUS situation is overall known but I will try to explain it just a bit here because I’m not a specialist neither in Docker, nor in Iptables nor in UFW. Situation:If for example you install Docker in you Linux system in, for example Ubuntu 18.x, and want …