What can be used to restrict connectivity to Azure virtual machines or subnets?
How do I create Network Security Groups in Azure?A network security group (NSG) in Azure is the way to activate a rule or access control list (ACL), which will allow or deny network traffic to your virtual machine instances in a virtual network. NSGs can be associated with subnets or individual virtual machine instances within that subnet. When an NSG is associated with a subnet, the ACL rules apply to all Virtual Machine instances of that subnet. In addition, you can further restrict traffic to an individual virtual machine by associating an NSG directly to that virtual machine. Considerations around configuring Network Security GroupsDefault rulesAll network security groups contain a set of default rules. You cannot delete the default rules, but since they are assigned the lowest priority, they can be replaced by the rules you create. As shown in the following predetermined rules, traffic that originates and terminates in a virtual network is allowed in both the inbound and outbound directions. Although Internet connectivity is allowed for the exit address, it is blocked for the entry address by default. There is a default rule to allow the Azure load balancer to poll the status of virtual machines and role instances. You can override this rule if you are not going to use a load balanced set. Association of network security groupsYou can associate a network security group with virtual machines, NICs, and subnets, depending on the deployment model you use:
You can associate different network security groups to a virtual machine (or NIC, depending on the deployment model) and to the subnet to which a NIC or virtual machine is linked. When this happens, all network access rules are applied to traffic, by priority in each network security group, in the following order: Inbound traffic:
Outbound traffic:
Virtual network and subnet designBecause network security groups can be applied to subnets, you can minimize the number of them by grouping resources by subnet and applying these groups to subnets. If you decide to apply network security groups to subnets, you may find that existing virtual networks and existing subnets have been defined without considering them. Therefore, you may need to define new subnets and virtual networks to fit the design of network security groups. In addition, you must implement new resources in the new subnets. Then, you could define a migration strategy to move the existing resources to the new subnets. Special rulesYou must also take into account the special rules listed below. Make sure that it does not block the traffic allowed by those rules because, otherwise, the infrastructure will not be able to communicate with essential Azure services.
ICMP TrafficThe rules of the current network security groups only allow TCP or UDP protocols. There is no specific ICMP tag. However, ICMP traffic is allowed within a virtual network by default thanks to the virtual network rules of entry (default 65000 input rule) that allow traffic to and from any port and protocol within the virtual network. Subnets
Load balancers
Step by Step configure a security group in Virtual Machine in AzureWe enter our portal and look for our resource group We go to the resource group panel and click on Add Assign the name of our security group and select our resource group and click on create We wait for the NSG to deploy and once completed, we can view it by clicking on All Services on the left-hand side and selecting Network Security Groups: We can now see our new NSG, and we can further configure it by clicking on the name: We need to assign a subnet to associate this NSG with, select Subnets on the left-hand side: Now click the Associate button so we can find our subnet and the virtual network that we created in part 1. Remember, we created this when we set up the Virtual Network: We can now see that we have the LukeLabVnet1 virtual network that we created and the LukeLabSubnet assigned to this network security group. Click Ok to configure: Creation of Security Groups in Azure Via PowerShell#Defining security rules for Virtual Machine entry$ rule1 = New-AzureRmNetworkSecurityRuleConfig -Name rdp-rule -Description “Allow RDP” -Access Allow -Protocol Tcp -Direction Inbound -Priority 100 -SourceAddressPrefix Internet -SourcePortRange * -DestinationAddressPrefix * -DestinationPortRange 3389 New-AzureRmNetworkSecurityGroup -ResourceGroupName $ ResourceGroupName -Location $ Location -Name “SECURITY” -SecurityRules $ rule1 #Creating Virtual Machine entry security ruleNew-AzureRmVM -ResourceGroupName $ ResourceGroupName -Location $ Location -VM $ vm Enjoy! What should you use to prevent traffic from an Azure virtual network from being?Explanation: Azure Firewall is one of the cloud-based, managed network security services that protect Azure Virtual Network resources. Azure firewall enables the clients to filter inbound and outbound traffic for Azure Resources.
Which type of connection allows for the connection between Azure virtual networks?Through VNet Peering: You can connect virtual networks to each other, enabling resources in either virtual network to communicate with each other, using virtual network peering. The virtual networks you connect can be in the same, or different, Azure regions.
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