Isolating Outward-Facing Server VM from Internal Virtual Machine Cluster: A Site-Focused Guide
In today's interconnected world, network security is paramount. One of the most critical aspects of network security is isolating outward-facing servers from internal virtual machine clusters. This article will provide a detailed guide on how to achieve this using a managed layer 2 or 3 network switch. We will cover the key concepts, subtitles, and provide properly formatted code blocks to help you implement this in your environment.
Understanding the Concept
The primary goal of isolating outward-facing servers from internal virtual machine clusters is to prevent unauthorized access to internal resources. An outward-facing server is a server that is accessible from the internet, while an internal virtual machine cluster is a group of virtual machines that are used for internal purposes only. By isolating these two components, we can reduce the attack surface of our network and improve overall security.
Implementing the Isolation
To implement this isolation, we will use a managed layer 2 or 3 network switch. This switch will act as a boundary between the outward-facing servers and the internal virtual machine cluster. We will create two separate VLANs (Virtual Local Area Networks) on the switch, one for the outward-facing servers and one for the internal virtual machine cluster. This will ensure that traffic between the two VLANs is isolated and cannot flow directly between them.
Creating the VLANs
To create the VLANs, we will use the following commands:
switch# configure terminal
switch(config)# vlan 10
switch(config-vlan)# name Outward-Facing-Servers
switch(config-vlan)# exit
switch(config)# vlan 20
switch(config-vlan)# name Internal-Virtual-Machine-Cluster
switch(config-vlan)# exit
Assigning Interfaces to the VLANs
Once the VLANs have been created, we need to assign interfaces to them. We will assign the interface that connects to the outward-facing servers to VLAN 10 and the interface that connects to the internal virtual machine cluster to VLAN 20. We will use the following commands:
switch# configure terminal
switch(config)# interface FastEthernet0/1
switch(config-if)# switchport mode access
switch(config-if)# switchport access vlan 10
switch(config-if)# exit
switch(config)# interface FastEthernet0/2
switch(config-if)# switchport mode access
switch(config-if)# switchport access vlan 20
switch(config-if)# exit
Configuring the Router
Now that the VLANs have been created and the interfaces have been assigned, we need to configure the router. We will create a sub-interface for each VLAN and assign an IP address to each sub-interface. We will use the following commands:
router# configure terminal
router(config)# interface FastEthernet0/0.10
router(config-subif)# encapsulation dot1Q 10
router(config-subif)# ip address 10.0.10.1 255.255.255.0
router(config-subif)# exit
router(config)# interface FastEthernet0/0.20
router(config-subif)# encapsulation dot1Q 20
router(config-subif)# ip address 10.0.20.1 255.255.255.0
router(config-subif)# exit
In this article, we have discussed how to isolate outward-facing servers from internal virtual machine clusters using a managed layer 2 or 3 network switch. We have covered the key concepts, provided detailed instructions on how to implement this, and provided properly formatted code blocks to help you implement this in your environment. By implementing this isolation, we can reduce the attack surface of our network and improve overall security.
References
- Cisco. (2021). Virtual LANs (VLANs