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ISP Technologies for 2021

SD-WAN  https://en.wikipedia.org/wiki/SD-WAN -- virtualizes WAN functions using software,  --- supports    MPLS ,  Last Mile Fiber Optic Network ,  4G   LTE  and  5G . VXLAN https://en.wikipedia.org/wiki/Virtual_Extensible_LAN  It uses a  VLAN -like encapsulation technique to encapsulate  OSI   layer 2   Ethernet frames  within  layer 4   UDP  datagrams, using 4789 as the default  IANA -assigned destination UDP port number. [ The VXLAN specification was originally created by  VMware ,  Arista Networks  and  Cisc o Other backers of the VXLAN technology include  Huawei , [7]   Broadcom ,  Citrix ,  Pica8 , Big Switch Networks,  Cumulus Networks ,  Dell EMC ,  Ericsson ,  Mellanox , [8]   FreeBSD , [9]   OpenBSD , [10]   Red Hat , [11]   Joyent , and  Juniper Networks . Open VSwitch - supports  VXLAN overlay...
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vSphere 6.5 Add iSCSI volume via ESXi Host Client  on Packet.net  ( add to Packet.net documentation) https://www.youtube.com/watch?time_continue=196&v=W6ZOeoD3Ud8&feature=emb_logo Click "Add Dynamic Target "   and fill in the ip address of the iSCSI volume  ( see packet.net console - storage for the ip address ) Click "Save Configuration" Click "Devices"   and then "Refresh" New iSCSI volume appears Click "New Datastore" to create a new datstore on the iSCSI volume.
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Install a LEMP Stack on CentOS 7

Here is a great tutorial for installing a LEMP stack on Linode https://www.linode.com/docs/web-servers/lemp/lemp-stack-on-centos-7-with-fastcgi/ I did this on Centos 7 and it worked great. Notes: 1. In your test.php file, remember to replace                     $username = "testuser";                    $password = "password"; with the username and password you created to login to  MariaDB  2. On Centos 7 you need to turn off SELinux or set it to permissive. Otherwise you'll get 'No Input file specified' when you test the web page If /var/log/nginx/error.log has '[error] 20049#20049: *43 FastCGI sent in stderr: "Unable to open primary script: /var/www/<yourwebsite>.com/test.php (No such file or directory)" Then you can temporarily set SELinux to permissive by running this command [root@linuxhost~]# setenforce 0 Then run [root@linuxhost~]# ...
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OSSEC Version 3.6.0 Install Successful on Google Cloud

Created by Andrew Francis March 11, 2020 ******************    OSSEC v. 3.6.0 INSTALL SUCCESSFUL  ************* This is on a CentOS 7 vm on Google Cloud Platform  uname -a Linux ids-server 3.10.0-1062.12.1.el7.x86_64 #1 SMP Tue Feb 4 23:02:59 UTC 2020 x86_64 x86_64 x86_64  CentOS Linux release 7.7.1908 (Core) [andy@ids-server ossec-hids-3.6.0]$   sudo yum install zlib-devel pcre2-devel make gcc  sudo  yum install mysql-devel postgresql-devel  sudo  yum install sqlite-devel  sudo yum install  libevent libevent-devel.x86_64  wget https://github.com/ossec/ossec-hids/archive/3.6.0.tar.gz  tar -xzvf 3.6.0.tar.gz  cd ossec-hids-3.6.0/ [andy@ids-server ossec-hids-3.6.0]$ sudo  PCRE2_SYSTEM=yes ./install.sh (en/br/cn/de/el/es/fr/hu/it/jp/nl/pl/ru/sr/tr) [en]: OSSEC HIDS v3.6.0 Installation Script - http://www.ossec.net You are about to start the installation process of the OSSEC...
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Zabbix

     www.zabbix.com   Page2     Screenshots:  https://sourceforge.net/projects/zabbix/?source=navbar Install Zabbix on CentOS 7 from rpm .     https://www.zabbix.com/download 1. Need CentOS 7 with LAMP Stack installed     https://www.rootusers.com/how-to-setup-lamp-web-server-with-centos-7/ 2. Install Zabbix from rpm package     https://www.zabbix.com/documentation/3.4/manual/installation/install_from_packages/rhel_centos Admin GUI               https://www.zabbix.com/documentation/3.4/manual/quickstart/login Add Ons https://share.zabbix.com/ Agents :   https://www.zabbix.com/download_agents Virtual Appliances :  KVM, Parallels, Xen. VirtualBox, VMWarePlayer,  OVF,  Hyper-V, Azure, .iso                                     https://www.zabbix.com/do...
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Linux Performance Monitoring

****Linux Performance Monitoring **** Check :   CPU Utilization, Memory, Disk space, # of network connections, disk i/o top df -h  cat /proc/cpuinfo  free -m  netstat -n iostat  Other : /var/log/messages docker ps  netstat -n  java logs  Tools: New Relic ,  Nagios ,  App Dynamics  chkmk , scout--  scoutapp,com  PRTG    vCenter    monitor network traffic bits/sec Articles : http://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages http://www.linuxjournal.com/article/9001 https://stackoverflow.com/questions/21617500/understanding-load-average-vs-cpu-usage https://en.wikipedia.org/wiki/Load_(computing) https://www.cyberciti.biz/tips/top-linux-monitoring-tools.html https://www.tecmint.com/linux-performance-monitoring-with-vmstat-and-iostat-commands/ https://linux.101hacks....
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CCNA Topics

----CCNA--- OSI Layers Spanning Tree Protocol CDP Config Files Connection/Connection-less Flow control NVRAM, Flash Card,  RAM,  CPU Reset cisco password TCP UDP ARP ICMP IP Subnets Broadcast address Secondary Addr Frame Relay Routing RIP IGRP EIGRP OSPF BGP Split Horizon Route poisoning ACL’s             Standard Extended Named WAN                 PPP                          HDLC – Serial                          PPP – UART Modem                 Frame Relay                         Address Mapping            ...
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