Module 9 - Networking

1. Network Concepts and Commands

2. Network Files

3. Network Services

4. Configure a network device

5. Network File-System (NFS & CIFS)

6. Network Communication (ssh & vnc)

7. Network X-clients (xming and nomachine-nx)

Networking

Network Concepts

• tcp/ip• IP Address• MAC Address• Default Gateway• DNS & Host Name resolving• DHCP and Static IP • Firewall, ports and the services file

•mii-tool• ipconfig•nslookup & dig•route & netstat•ping•nmap

Network Commands

• /etc/hosts• /etc/resolv.conf• /etc/sysconfig/network• /etc/sysconfig/network-scripts/ifcfg-eth0

Network Files

Controlling the Network Service:• /etc/init.d/network• /etc/init.d/NetworkManager

Controlling a Network Device:• ifup and ifdown scripts

Network Services

• SETUP STATIC IP:

Edit /etc/sysconfig/network-scripts/ifcfg-eth0 

DEVICE=eth0HWADDR=96:1D:56:92:C9:28 ONBOOT=yesBOOTPROTO=noneIPADDR=192.168.1.20NETMASK=255.255.255.0GATEWAY=192.168.1.1TYPE=Ethernet

Configure a network device

• SETUP DHCP• In order to setup DHCP for the network interface card,

Edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file:

DEVICE=eth0HWADDR=96:1D:56:92:C9:28 ONBOOT=yesBOOTPROTO=dhcp

Configure a network device

• A native UNIX Network File-System to share data on the network.

• Required package nfs-utils • /etc/init.d/nfs• /etc/exports

/ort *(rw,no_root_squash)

• Mount the shared nfs file-system:

# mount 192.168.10.1:/ort /public

### Can permanently go into /etc/fstab ###

Linux NFS Service

• The Linux samba service can offer native windows CIFS network file-system to both Linux and Windows nodes.

• Requires package samba.x86_64• /etc/samba/smb.conf is the main configuration file• /etc/init.d/smb is the samba server service

Linux CIFS

• CLI client which enable us to open a remote shell.• Encrypted Communication• Can use encryption keys• By default uses port 22• main configuration directory is /etc/ssh• Under each user home directory resides a

hidden .ssh directory with the user specific files

Linux SSH

• A simple and easy way to connect remotely to a Linux node using a network light GUI protocol.

• The user configuration files reside under a hidden .vnc directory in the user home folder.

• The server configuration file is in:

# /etc/sysconfig/vnc• the service is under /etc/init.d/vncserver

Linux vnc

• xming (Open Source)

• NoMachine NX Client and Server (Proprietary, Free for 3 users)

Linux Remote X-Clients

1. Document your IP Address

2. Document your Default Route

3. Document your DNS Servers

4. Change your hostname to [your-name-01]

5. Fix a permanent IP Address using the address you got from the DHCP Server.

6. Disable selinux

7. Shutdown and disable Firewall

Exercise

8. Connect to your Linux node from the windows node using putty and ssh protocol.

9. Set up vnc server on the Linux node and connect to the vnc server using a vnc client from windows.

10. Set up Xming to connect to the Linux node via X-server .

Exercise

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