Virtual-Lan

Setup a Virtual Local Area Network environment for OPS535 Labs

OS Installation

• Install 64-bit version of CentOS 5.5 with Virtualization Packages
• Create Four Virtual Machines, each with 8GB of disk space, 1G Memory, 1CPU
• Install CentOS5.5 on VM1 to VM3 with at least the following packages:
  • NFS
  • NIS
  • DNS
  • DHCP
  • Postfix, sendmail
  • OpenLDAP
• CentOS 5.5 configuration:
  • Enable iptables
  • Create a regular user account
  • Enable SELinux

• Collect the following information:
  • IP address(es) assigned to the host OS and each VM for the virtual network
  • Name of the network device used by the host OS to connect to the virtual network
  • IP address, netmask, and gateway for each guest OS
  • Name of the device used by each guest OS to connect to the virtual network

• Install Fedora 14 on VM4 with the following packages:
  • NFS
  • NIS
  • DNS
  • OpenLDAP
  • Wireshark
  • tcpdump

Virtual Network Configuration

• Default Virtual Network
  • Network Address 192.168.122.0/24
  • Network Type: NAT
• Create the 2nd Virtual Network, named "opsnet"
  • Network Address 192.168.[x].0/24 where [x] assigned by your professor
  • Network Type: Isolated
• Locate the name of the physical network device connected to the lab network. The following configuration assume eth3 as the device name name.
  • assignment 172.16.[x].1 to the alias of eth3: ifconfig eth3:0 172.16.[x].1
• Adding routes to each student's "opsnet" virtual network manually or by running the following bash script on the host OS:

#!/bin/bash
route add -net 192.168.1.0 netmask 255.255.255.0 gw 172.16.1.1
route add -net 192.168.2.0 netmask 255.255.255.0 gw 172.16.2.1
route add -net 192.168.3.0 netmask 255.255.255.0 gw 172.16.3.1
route add -net 192.168.4.0 netmask 255.255.255.0 gw 172.16.4.1
...
route add -net 192.168.36.0 netmask 255.255.255.0 gw 172.16.36.1

or:

#!/bin/bash
x=1
while [ $x -le 36 ]
do
  route add -net 192.168.${x}.0 netmask 255.255.255.0 gw 172.16.${x}.1
  x=$(expr $x + 1)
done

• To test your static routes, pair up with a few fellow students and try to ping their VMs in their "opsnet".

• Save your network settings for the real lab.

Private Network Address Allocation

• Network Address Allocation for 2011 Winter Semester

CentOS Installation and update Issues

If you think that the yum update process takes too long to complete, inspect the file /etc/yum.repos.d/CentOS-Base.repo and add belmont to the baseurl under the [base] and [updates] sections:

baseurl=http://belmont.senecac.on.ca/centos/$releasever/os/$basearch/

Place the above line before the "mirrorlist=" line and try running yum update again.

My Questions

• I can't ping other student's vm. What should do to fix that?