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# Configurare GRE tunel (VPN) on Ubuntu Linux
# There are two ubuntu servers acting as routers on their own LAN networks 172.18.17.0/24 , 172.18.18.0/24 respectively
# Each of the servers also have public IP address
# configure /etc/network/interfaces on the servers adding *gre1* interface

#Ubuntu1 - 192.168.168.1/30 is the local IP address on the gre1 interface , this IP will comunicate with the remote gre1 tunnel interface for routing
#        - <post-up> command: 172.18.18.0/24 which is the remote LAN is routed through the tunnel to 192.168.168.2
auto gre1
iface gre1 inet tunnel
  address 192.168.168.1

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#!/bin/sh
# Script pentru backup remote prin ftp
# Dependente: mysql,mysqldump,gzip,curlftpfs
#
# Autor: Alex Duzsardi alex[dot]duzsardi[at]pitechplus[dot]com
#        www.pitechplus.com
# ---------------------------------------------------------------------

### Variabile si configuratii ###

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#!/bin/bash
# Configurare firewall ('man iptables') linux
# Cerinte: privilegii elevate (root)
# Setari: copiaza scriptul undeva accesibil doar de userul 'root' ,
#         editeaza /etc/rc.local si inainte de 'exit 0' adauga calea absoluta spre script ex: /root/firewall.sh
# Contact: Alex Duzsardi <alex.duzsardi@pitechplus.com>
#          www.pitechplus.com
#--------------------------------------------------------------

# Scriptul va rula cu debuging activat

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Creating a bootable macOS USB installer

• First, plug in an 8GB (or bigger) USB drive, and use Disk Utility to erase it
• If you use the default settings, you should wind up with a blank drive at /Volumes/Untitled.

With that volume in place, and with the macOS installer sitting in /Applications/Install\ macOS\ [VERSION].app, run the following command in your terminal to create a bootable install media (for Sierra):

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction

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#You can do this using the PermitRootLogin directive. From the sshd_config manpage:
#
#    Specifies whether root can log in using ssh(1). The argument must be “yes”, “without-password”, “forced-commands-only”, or “no”. The default is “yes”.
#
#    If this option is set to “without-password”, password authentication is disabled for root.
#
#The following will accomplish what you want:

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# https://www.rationallyparanoid.com/articles/tcpdump.html

# DHCP debugging with tcpdump
# filter to match DHCP packets including a specific Client MAC Address:
tcpdump -i br0 -vvv -s 1500 '((port 67 or port 68) and (udp[38:4] = 0x3e0ccf08))'

# filter to capture packets sent by the client (DISCOVER, REQUEST, INFORM): 
tcpdump -i br0 -vvv -s 1500 '((port 67 or port 68) and (udp[8:1] = 0x1))'

# Monitoring on interface eth0

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<VirtualHost *:443>
LoadModule slotmem_shm_module /usr/lib/apache2/modules/mod_slotmem_shm.so
LoadModule proxy_balancer_module /usr/lib/apache2/modules/mod_proxy_balancer.so
LoadModule lbmethod_byrequests_module /usr/lib/apache2/modules/mod_lbmethod_byrequests.so

   ServerName dev.mydomain.com

        <Proxy "balancer://mycluster">
        BalancerMember "http://10.0.0.167:9090"
        BalancerMember "http://10.0.0.168:9090"

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															SSH-KEYGEN 
ssh-keygen
	- generate ssh authentication keys
	- default RSA key
	- -t option for other types DSA,ECDSA,ED25519
	- can generate DH (Diffie-Hellman group exchange DH-GEX)
	- can generate and update Key Revocation Lists
	
OPTIONS 
-A = create sshd keys (host keys)

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#!/bin/bash
openssl pkcs7 -inform DER -in "$1" -print_certs -out "$1.pem"
openssl smime -verify -in "$1" -inform der -noverify -signer "$1.pem" -out "$1.pdf" 2>/dev/null
rm "$1.pem"
evince "$1.pdf"
rm "$1.pdf

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VIM Commands

:vsp = vertical split
:sp = horizontal split
:quit - close current split
ctrl+w+w - change splited windows
:x - save and exit
:q - quit 
:q! - quit without saving changes
:wq - write changes and quit