Configure Linux Virtual Local Area Network (VLAN)VLAN is an acronym for Virtual Local Area Network. Several VLANs can co- exist on a single physical switch, which are configured via Linux software and not through hardware interface (you still need to configure actual hardware switch too).
Hubs or switch connects all nodes in a LAN and node can communicate without a router. For example, all nodes in LAN A can communicate with each other without the need for a router. If a node from LAN A wants to communicate with LAN B node, you need to use a router. Therefore, each LAN (A, B, C and so on) are separated using a router. VLAN as a name suggest combine multiple LANs at once. But, what are the advantages of VLAN?
Performance. Ease of management. Security. Trunks. VLANs give you the ability to sub- divide a LAN for security purpose. You don’t have to configure any hardware device, when physically moving server computer to another location and more. Fundamental discussion about VLAN or switches is beyond the scope of this blog post.
A computer network or data network is a telecommunications network which allows computers to exchange data. In computer networks, networked computing devices exchange. Take the first step to ordering TV service today with some easy comparisons of leading providers. Consider the home entertainment options in your area and find best.
I suggest the following textbooks: A note about your LAN hardware. To be able to use VLANs you will need a switch that support the IEEE 8. Ethernet network. You will also need a NIC (Network Interface Card) that works with Linux and support 8.
Linux VLAN configuration issues. I am lucky enough to get a couple of hints from our internal wiki: Not all network drivers support VLAN.
You may need to patch your driver. MTU may be another problem. VLAN works by tagging each frame i. Ethernet header extension that enlarges the header from 1. The VLAN tag contains the VLAN ID and priority. Do not use VLAN ID 1 as it may be used for admin purpose.
Enough talk, let’s get to the Linux VLAN configurations. Setting up 8. 02. VLAN tagging by loading 8. Linux kernel driver. First, make sure that the Linux kernel driver (module) called 8.
If the module is not loaded, load it with the following modprobe command: # modprobe 8. Method #1: Cent. OS/RHLE/Fedora Linux VLAN How. To. I am using RHEL/Cent. OS Linux with VLAN ID # 5. So I need to copy file /etc/sysconfig/network- scripts/ifcfg- eth. Now, I’ve one network card (eth. VLAN ID 5. eth. 0 – Your regular network interfaceeth.
Welcome to Kijiji, Canada's most popular free, local classifieds site. Select Location. To see classifieds ads or post your own free ad, click an area. Definition: A local area network (LAN) supplies networking capability to a group of computers in close proximity to each other such as in an office. What is LAN? Local Area Network is localize Computer network use for communication between host systems, In LAN each device shared the same IP address scheme.
Your virtual interface that use untagged frames. Do not modify /etc/sysconfig/network- scripts/ifcfg- eth.
Now open file /etc/sysconfig/network- scripts/ifcfg- eth. Find DEVICE=eth. 0 line and replace with: DEVICE=eth. Also, append the following line: VLAN=yes.
Make sure you assign correct IP address using DHCP or static IP. Remove gateway entry from all other network config files.
A VLAN is a “Virtual Local Area Network” and is present in L2 (Level 2) of the protocal stack. The above postings may be misleading in that the word.
Only add gateway to /etc/sysconfig/network file. This whole configuration may sound complicated.
So I am including sample configurations files for you: /etc/sysconfig/network- scripts/ifcfg- eth. VLAN configuration for my eth. ID - 5 #. DEVICE=eth. BOOTPROTO=none. ONBOOT=yes. IPADDR=1. 92. 1. 68.
NETMASK=2. 55. 2. USERCTL=no. NETWORK=1.
VLAN=yes/etc/sysconfig/network- scripts/ifcfg- eth. Actual configuration for my eth. DEVICE=eth. 0TYPE=Ethernet.
BOOTPROTO=none. ONBOOT=yes. Finally, restart networking service on a Cent. OS/RHEL/Fedora Linux, type: # /etc/init. OR# service network restart. NOTE: If you need a second VLAN i. VLAN ID 2 then copy the /etc/sysconfig/network- scripts/ifcfg- eth.
Method #2: Using the vconfig command. Above method is perfect and works with a Red hat Enterprise Linux / Cent. OS / Fedora Linux without any problem. However, you will notice that there is a command called vconfig.
The vconfig program allows you to create and remove vlan- devices on a vlan enabled kernel. Vlan- devices are virtual Ethernet devices which represents the virtual lans on the physical lan.
This is yet another method of configuring VLAN. To add VLAN ID 5 with following command for eth. The vconfig add command creates a vlan- device on eth. You can use normal ifconfig command to see device information: # ifconfig eth.
Use ifconfig command to assign IP address to vlan interfere: # ifconfig eth. To get detailed information about VLAN interface, type: # cat /proc/net/vlan/eth. If you wish to delete VLAN interface use delete command as follows: # ifconfig eth. See vconfig(8) Linux man page for more information on syntax and examples.
Method #3: Create the VLAN device using the ip command. Use the ip command as follows for the interface eth.
You need to activate and add an IP address to vlan link, type: # ip addr add 1. All traffic will go through the eth. BLAN tag 5. Only VLAN aware devices can accept the traffic, otherwise the traffic is dropped. How can I remove VLAN ID 5? Type the following commands# ip link set dev eth.
How do I make above VLAN configuration permanent on a Debian or Ubuntu based system? Edit the /etc/network/interfaces file, enter: $ sudo vi /etc/network/interfaces. Update configuration as follows: ## vlan for eth. ID - 5 on a Debian/Ubuntu Linux##. Save and close the file. See also# Additional correction by John T and others; Editing by VG – log #Share this on.