Everyman IT

Info

• Level: Intermediate
• Presenter: Eli the Computer Guy
• Date Created: September 16, 2010
• Length of Class: 51 Mintues

Tracks

• Linux

Prerequisites

1. Introduction to Linux
2. Installing Linux
3. Basic Linux Tasks
4. VIM for File Editing
5. Navigation in Linux

Purpose of Class

• This class teaches students how to configure their Linux servers networking.

Topics Covered

• ifconfig Command
• DHCP Releae and Renew
• Restarting the Network Service
• Editing the interfaces File to Setup a Static IP Address
• Editing the resolv.conf File for DNS
• Changing the Serves Hostname’
• Ping for Troubleshooting
• UFW Firewall Configuration

Class Notes

1. Basic Tasks
   1. To Show Current IP Addresses and Network Configuration = sudo ifconfi
   2. To Release and Renew IP Address = sudo dhclient
   3. To Restart the Networking Service = sudo /etc/init.d/networking restart
   4. Always Restart the Networking Service After Changing Network Configurations
2. Network Config file
3. To Edit the Network Adapter Configurations = sudo vim /etc/network/interfaces
   1. auto eth0 = Auto Negotiate Speed for Ethernet Card 0
   2. iface eth0 inet static /dhcp = Ethernet Card 0 Either Static or DHCP Address.  If DHCP Don’t Go Further.
   3. address 192.168.1.100 = Static IP Address
   4. netmask 255.255.255.0 = Subnet Mssk
   5. network 192.168.1.0 = Network (Generally Your IP Address Siply with a 0 in the Last Octet))
   6. broadcast 192.168.1.255 = Broadcast Address (The Last Address in Your Subnet. Generally Your IP Address with a 255 in the Last Octet.)
   7. gateway 192.168.1.1 = Default Gateway.  Generally Your ISP Modem or Router
   8. To Edit the DNS Resolution File = sudo vim /etc/resolv.conf
   9. To See Current Hostname = sudo /bin/hostname
   10. To Change Hostname = sudo /bin/hostname newhostname
4. Ping
   1. To Determine if You Can See an IP Address = ping IP Address
   2. To Determine DNS is Working = ping domainname
5. UFW firewall
   1. To Chaneg Default Handling of Ports When UFW is Enabled = sudo ufw default allow/deny
   2. To Turn UFW on or Off = sudo ufw enable/disable
   3. To Open or Close Ports for Everyone = sudo ufw allow/deny port#
   4. To Delete a UFW Rule = sudo ufw delete allow/deny port#
   5. To Allow Access to All Ports from a Specific IP Address = sudo ufw allow from IP Address
   6. To Allow Access to a Specific Port from a Specific IP Address = sudo ufw allow from IP Address to any port port#
6. Final Thoughts
   1. Drivers Should Work Out of the Box…
   2. Wireless Networking is Its own Topic

Resources