How to create sub interface on cisco router

How many sub interfaces does a Cisco router have?

Subinterfaces divide the parent interface into two or more virtual interfaces on which you can assign unique Layer 3 parameters such as IP addresses and dynamic routing protocols. The IP address for each subinterface should be in a different subnet from any other subinterface on the parent interface.

What is sub interface Cisco?

A subinterface is a virtual interface created by dividing one physical interface into multiple logical interfaces. A subinterface in a Cisco Router uses the parent physical interface for sending and receiving data. Subinterfaces are used for a variety of purposes.

How do I create a VLAN on a Cisco router?

You configure VLANs in vlan global configuration command by entering a VLAN ID. Enter a new VLAN ID to create a VLAN, or enter an existing VLAN ID to modify that VLAN. When you have finished the configuration, you must exit VLAN configuration mode for the configuration to take effect.

Can you put VLANs on a router?

You can configure the software to allow traffic on a VLAN to be treated as if the VLAN were a router port. A port can be either a VLAN port or a router port, but not both. However, a VLAN port may be part of a VLAN that is itself a router port.

Should I Enable VLAN on my router?

VLANs provide an excellent and low cost method of greatly improving you home network security and should be considered if you share your network with guests, and or have IOT devices connected to your Network.

Does home need VLAN?

You only need VLANs if you have a need to isolate traffic on different broadcast domains. The only real reasons for this would be security, performance, or scale.

How do I set up a VLAN tag?

To configure a tag-based VLAN
  1. Create a VLAN and add tagged member ports to it. From the main menu, click VLAN Configuration, then click 802.1Q VLAN Operation Mode. Click Add. Type a name for the new VLAN.
  2. VLAN filter . Port VID (PVID) Port VLAN ID that will be assigned to untagged traffic on a given port.

How do I setup a VLAN at home?

  1. Step 1: Create VLAN interface. go to Interfaces > Assignments > VLANs.
  2. Step 2: Setup new network interface to use the VLAN interface. go to Interfaces > Assignments.
  3. Step 3: Enable DHCP Server to auto assign IP address.
  4. Step 4: Setup firewall rules to allow Internet access only.

How do I make VLANs see each other?

The simplest way to enable routing between the two VLANs to simply connect an additional port from each VLAN into a Router. The Router doesn’t know that it has two connections to the same switch — nor does it need to. The Router operates like normal when routing packets between two networks.

Are VLANs worth it?

VLANs can be worth setting up in a home network environment to isolate certain devices, improve network security, and make for a more organized and easier to manage home network setup. They are relatively easy to setup and only require a network switch that supports VLAN tagging.

How safe are VLANs?

sure, it’s safe. traffic can’t cross between vlans unless you have something connecting them. the increased risk is in user error. it’s a lot easier to assign the wrong vlan when you’re configuring a switch than to physically put the cable in the wrong device.

What is a VLAN hopping attack?

VLAN hopping is a computer security exploit, a method of attacking networked resources on a virtual LAN (VLAN). The basic concept behind all VLAN hopping attacks is for an attacking host on a VLAN to gain access to traffic on other VLANs that would normally not be accessible.

How do I stop VLAN hopping?

To prevent the VLAN hopping from being exploited, we can do the below mitigations: Ensure that ports are not set to negotiate trunks automatically by disabling DTP: NEVER use VLAN 1 at all. Disable unused ports and put them in an unused VLAN ▪ Always use a dedicated VLAN ID for all trunk ports.

What are three techniques for mitigating VLAN attacks?

Mitigating a VLAN attack can be done by disabling Dynamic Trunking Protocol (DTP), manually setting ports to trunking mode, and by setting the native VLAN of trunk links to VLANs not in use.

How do you bypass a VLAN?

There are two techniques for vlan hopping. Take advantage of auto trunking by making the router think you are another router and then you have access to all vlans. Artificially create double tagged packets and take advantage of backward comparability to hop to the target vlan.

What is a double VLAN?

Double VLANs pass traffic from one customer domain to another through the metro core. You can use VLANs to specify customer ports and a service provider port. In this example, the switches have the same configuration.

Are network switches secure?

Unmanaged switches, on the whole, have very basic security. They’re secured by ensuring you have no vulnerabilities from system to system, which accessories like a lockable port cover can ensure no-one is tampering with the device directly.

Are all Cisco switches VLAN capable?

Almost Cisco switches (both fixed configuration and modular switches) are capable of Vlan configuration. Yes, the standard switches are cheaper. An organization need to deploy a VLAN when they need to manage different work-groups. Routing is needed to provide the communications between two Vlan also.