Scenario:
- Router: Ubuntu Server with 1 network card.
- Clients: 2 WindowsXP in VLAN10,1 Ubuntu and 1 CentOS in VLAN20.
- Switch: Cisco 2960
Cisco 2960 Switch Configuration:
interface FastEthernet0/1 description CONNECTED TO UBUNTU ROUTER switchport mode trunk ! ! ! interface FastEthernet0/5 description WINXP-1 switchport access vlan 10 switchport mode access ! interface FastEthernet0/6 description WINXP-2 switchport access vlan 10 switchport mode access ! ! ! interface FastEthernet0/15 description UBUNTU CLIENT switchport access vlan 20 switchport mode access ! interface FastEthernet0/16 description CentOS CLIENT switchport access vlan 20 switchport mode access
Ubuntu Router Configuration:
To install the vlan support on ubuntu, use this command:
sudo apt-get install vlan
Now we shall configure the vlans on Ubuntu router by editing the /etc/network/interfaces:
sudo nano /etc/network/interfaces
To enable ip forwarding, edit /etc/sysctl.conf file:
sudo nano /etc/sysctl.conf
Change net.ipv4.ip_forward from 0 to 1:
Load “8021q” kernel module:
(Optional): If the Ubuntu router didn’t load the 8021q kernel module at boot time, then use this command to add the module to the kernel on boot:
sudo su -c 'echo "8021q" >> /etc/modules'
Restart the Networking service:
sudo /etc/init.d/networking restart
Use the ifconfig command to check the newly created vlan interfaces:
ifconfig
Verify the vlan configuration:
sudo cat /proc/net/vlan/config
Test from WinXP-1:
Test from WinXP-2:
Test from Ubuntu Client:
Test from CentOS Client:
Hope this will help you!
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