Dhcp

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This document provides instructions for configuring a Cisco router with DHCP service to assign IP addresses to clients on a network. It describes entering privilege mode on the router, enabling the DHCP server, configuring an address pool with the subnet and default gateway, and saving the configuration.

Network with DHCP Service Cisco router 2621 Cisco Switch 2950

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Basic Security @ Updates -Update manager -Enable automatic security updates(Update Setting) => Super windows => type the key word (System Setting) => @ Firewall -In Ubuntu all ports are block by default -Default firewall-ufw (turned off by default) +sudo ufw status +sudo ufw enable/disable -Firestarter for graphical interface (recommanded) +sudo apt-get install firestarter +Preferences @ User Accounts -User & Groups +Disable user guest -Do not use root user (Disable by default) +sudo passwd +sudo passwd -l root (disable/changed expiry password) -Use sudo instead of root (/etc/sudoers) +sudo visudo OR sudo gedit /etc/sudoers(To set the privilege user authorized) +sudo adduser tolaleng sudo -Deleting Users +sudo deluser canamall -Removing world readable permission to home directory +sudo chmod 0750 /home/username -Locking/Unlocking user +sudo passwd -l username (enable user expiry) +sudo passwd -u username (disable user expiry) -passwords +sudo chage canamall (Set the password expiration) +sudo chage-l canamall (show the password expiration) @ Antivirus -Clam TK (Under Accessories), other anti-virus @ Unistall Applications -Ubuntu Software Center-> Installed software section-> Select application and click remove @ Processes -To see processes +ps aux or top +system monitor(cacti, nagios,) - @ Logs -Some of logs + /var/log/messages : general log messages + /var/log/boot : system boot log + /var/log/debug/ : debugging log messages + /var/log/auth.log : user login and authentication logs + /var/log/daemon.log : running services such as squid,ntpd and other log message to this file + /var/log/kern.log : kernel log file -Viewing logs + tail, more, cat, less, grep + GNOME system log viewer @Firewall ufw => Security Host * Create Standard User and enable user passwd (complexity password, strong passwd, passwd expired, invalid day of passwd, Lock and Unlock user, disable user Guest, ) * Secure remote network and host -Telnet(Secure with the host and address connection) -SSH (Secure with the authentication encryption key) => Security Backup (Data Hosting) *Make a Full Backup of Your Machine -Aptik (backup application) -rsync (Remote synce) -Gsync (Remote) -Amanda -Rsnapshot

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