Cyberoam configuring vlan

1. Configuring Cyberoam VLAN
VLAN Configuration in Cyberoam.
This article documents how to implement IEEE 802.1Q Virtual LAN (VLAN) technology
between Cyberoam appliance and 802.1Q-compliant devices, such as Cisco switches and
routers.
Virtual Local Area Networks (VLANs) use tag-based LAN multiplexing technology to
simulate multiple LAN’s within a single physical LAN using IP header tagging. VLAN
ID/tags are 4-byte frame extensions that contain a VLAN identifier as well as other
information.
VLANs multiply the capabilities of Cyberoam appliance. VLAN tags added to network
frames increases the number of network interfaces (ports) beyond the available physical
ports on the Cyberoam appliance.
Advantages
• Increased Port density
• Logical segmentation of Network irrespective of physical placement
• Granular security on heterogeneous LANs
• Improved Network throughput as VLAN confines broadcast domain
Using VLANs, a single Cyberoam appliance can provide security services and control
connections between multiple domains. Traffic from each domain is given a different VLAN
ID. Cyberoam can recognize VLAN IDs and apply security policies to secure network
between domains. Cyberoam can also apply authentication, various policies, and firewall
rule features for network.
Cyberoam Configuration
Follow the below given steps from Web Admin console to configure VLAN:
Step 1: Define virtual subinterface
Go to System>Configure Network>Manage Interface and click “Add VLAN Subinterface”
button to open the create page
Configuring Virtual LAN

2. Configuring Cyberoam VLAN
Physical Interface: Select interface for which the virtual subinterface is to be defined.
Virtual subinterface will be the member of selected physical Interface/Port. The dropdown
menu will list only the LAN and DMZ interfaces.
VLAN ID: Specify VLAN ID. The interface VLAN ID can be any number between 2 and
4094. The VLAN ID of each virtual subinterface must match the VLAN ID of the packet. If
the IDs do not match, the virtual subinterface will not receive the VLAN tagged traffic.
Virtual Interfaces added to the same physical interface cannot have the same VLAN ID.
However, you can add virtual subinterfaces with the same VLAN ID to different physical
interfaces
IP address: Specify IP address and netmask for the virtual subinterfaces. Assign static IP
address only. Only static IP address can be assigned and Subnet ID should be unique
across all the physical/virtual subinterfaces
Zone: Select virtual subinterface Zone. Virtual subinterface will be the member of the
selected zone. Virtual subinterface created will remain unused until it is included in a zone.
Virtual subinterface can be the member of LAN, DMZ or custom zone.
Note:
1. Zone membership can be defined at the time of defining virtual subinterface or later
whenever required.
2. Virtual subinterface can be the member of custom zone.
3. Virtual subinterface cannot be the member of WAN zone
On successful creation, Interface details (System>Configuration Network>Manage
Interface page) will display newly defined virtual subinterface under the selected physical
interface.

3. Configuring Cyberoam VLAN
Step 2 : Restart Management services from CLI console
Logon to CLI console through SSH or Telnet and select option R Restart Management
Services
Once the virtual interface is defined and is included in a zone, it can be treated exactly
same as the physical interface. Customization of firewall rules that govern the traffic
between VLANs and other interfaces, IDP policies and virus and spam scanning can be
performed the same way as done with the physical interface.
If virtual subinterface is defined for custom zone, two default firewall rules for the zone are
automatically created for the custom zone. For example, if virtual subinterface is defined
for LAN zone, 2 default firewall rules under Virtual subinterface to WAN zone are
automatically created based on the default LAN to WAN zone firewall rules.
From version 9.5.4 build 66 onwards, VLAN (Virtual LAN) tags will be preserved even
when antivirus scanning, spam filtering and web filtering using Internet Access Policy (IAP)
are applied to VLAN tagged traffic in Bridge mode.
Document version – 1.0-19/08/2008