Inbound and Outbound Rules

Inbound and Outbound Rules in EC2 Security Group

Introduction

  • In this section, Elastic compute cloud (EC2) is a web service that provides secure, resizable compute capacity in the cloud. It is used to make web-scale cloud computing easier for developers.
  • Firstly, EC2 Inbound Outbound Rules is components of the security group
  • An EC2 instance is a virtual server in the Amazon Elastic Compute cloud for running applications on AWS infrastructure.

What is Security Group?

  • The security group act as a virtual firewall of your instance to control inbound and outbound traffic, it acts at the instance level, not the subnet level.
  • Secondly, when you launch a VPC, you can assign up to five security groups to the instance. 

What is Inbound Rule?

  • EC2 Inbound Outbound Rules – It filters traffic passing from the network to the local computer based on the filtering conditions specified in the rule.
  • In other words, someone else from outside of your computer initiates the connection to your computer, so traffic flowing in word to your machine. (the port type we give to the group only that port will be allowed)

What is Outbound Rule?

  • It filters traffic passing local computers to the network based on the filtering conditions specified in the rules.
  • By default, the security group allows outbound traffic.

How to give Inbound and Outbound role in security group?

  • First, we have to log in to “AWS Root User”. The AWS Management Console will open.
  • In AWS Management Console go to “Services”.
  • There click on “EC2”.
Figure1. AWS Sign in page.
Figure1. AWS Sign in page.
Figure2. AWS Management console.
Figure2. AWS Management console.
Figure3. Shows EC2 in services.
Figure4. EC2 Dashboard.
Figure4. EC2 Dashboard.
  • In dashboard click on “Security Groups”.
	Figure5. Click on security group.
Figure5. Click on security group.
Figure6. Security Group page.
Figure6. Security Group page.
  • Click on “Create security group”.
Figure7. Security Group Creation page.
Figure7. Security Group Creation page.
  • Add the security group name.
  • Add a description to the group you are going to create which describes the access you going to give to this group
  • Attach custom vpc
  • Give Inbound rules by clicking “Add rules”.
Figure8. Inbound and Outbound rules.
Figure8. Inbound and Outbound rules.
  • Select the Type TCP you want to give by clicking on Custom TCP.
Figure9. Shows no of TCP.
Figure9. Shows no of TCP.

Ports Selections

  • There are different types of ports like Custom TCP, Custom UDP, IPv4, IPv6, All TCP, etc.  (by this we can handle who has to login to your instance)
  • Now select “SSH”. (mainly, it is used to log in remotely one system to another system and it is very secured prototype)
  • Give Source, means it gives IP address with that IP address we have access to your instance.
  • We can give Custom IP address (give manual IP address with that IP you log in), or Anywhere (we can log in from anywhere), My IP (you have to log in with your IP).
  • Give source as Anywhere.
Figure1.0. Give source.
Figure1.0. Give source.
  • Furthermore, add another rule click on “Add rules”.
Figure1.2. Adding another rule.
  • Now, this time give HTTP. (it gives access to the internet and it is a secured prototype)
  • Give source as Anywhere.
  • Now give the Outbound rule.
  • Another key point, the security group allows All traffic in outbound rules because it has to answer any type of traffics that comes from inbound traffic.
Figure1.3. Outbound rules.
Figure1.3. Outbound rules.
  • If you want to give a tag.
  • Click on “Create security group”.
Figure1.4. Security Group is created.
Figure1.4. Security Group is created.

How to give this security group to EC2 instance?

  • Go the EC2 dashboard.
  •  Click on “Running Instance”.
Figure1.5. Showing running instance.
Figure1.5. Showing running instance.
	Figure1.6. EC2 Instance page.
Figure1.6. EC2 Instance page.
  • Click on Launch “Instance”.
Figure1.7. Showing AMI (Amazon Machine Image) page.
Figure1.7. Showing AMI (Amazon Machine Image) page.

Select All Inputs

  • Here we see AMIs it contains the software configuration system to launch the instance.
  • In this operating system, we have to choose one.
  • There are some free AMIs which we can access freely.
  • We have to choose free AMIs to launch an instance.
  • Choose “Amazon Linux”, and click on “Select”.
  • Select bits according to your computer configuration.
	Figure1.8. Choose Instance type.
Figure1.8. Choose Instance type.
  • Here we see various instance types these are virtual services that can run applications.
  • There are families like General purpose, Compute-optimized, GPU instance, Memory-optimized (to see these families, scroll down).
  • There are many Types like t2. micro, t2.micro, t2.small, t2.medum, etc. these all define the storage capacity of an instance selected according to your needs.
  • Important to realize except t2.micro remaining all instance types will be charged.
  • Therefore, Select “General purpose, t2.micro”.
  • Click on “Next”.
Figure1.9. Configuration page.
Figure1.9. Configuration page.

Bootstrap scripts.

Figure2.0. Remaining Configure instance page.
  • We have to give “Number of instances” we want according to your needs (as per now give one instance).
  • Don’t give the purchasing options. (if we give, we have to purchase)
  • Give “Network it gives one default VPC”.
  • Select “Subnet means we have to select on Availability Zone”.
  • “Enable” Public IP.
  • Don’t give a Placement group.
  • In details, Give Shutdown Behavior as “Terminate” (because when we shut down the instance it will run in the background, so for this we have to give terminate option).
  •  Remaining all keep it as it is.
  • Click on “Next”.
Figure2.1. Storage page.
  • Root is like a C drive on our computer.
  • We can give any storage size.
  • IPOS (Input-output service) it will increase according to the storage size.
  • We can add the storage to the system by clicking on “Add New Volume”. (like we are adding drives to the computer)
Figure2.2. Showing Add volume page.
Figure2.2. Showing Add volume page.
  • Click on “Next”.
 Figure2.3. Add Tags page.
Figure2.3. Add Tags page.
  • Give tags to the Instance.
  • Click on “Next”.
Figure2.4. Security group.
  • Now select the security group which you have created.
  • By selecting existing security group.
Figure2.5. Selecting existing security group.
  • Click on “Review and Launch”.
Figure2.6. Review page.
Figure2.6. Review page.
  • Here we can see the details which we given.
  • Click on “Lunch”.

Key Pair Settings

Figure2.7. Key pair Page.
Figure2.7. Key pair Page.
  • Key pair which is used to run the Linux instance.
  •  Amazon EC2 uses public-key cryptography to encrypt and decrypt login information.
  • Create a new key pair and give the name to the key pair.
  • Click on “Download key pair”.  download the key pair file to login to the instance.
  • Click on “Lunch”.
Figure2.8. Status page.
Figure2.8. Status page.
  • The instance has crated.
  • To see that go back to the instance page.
Figure2.9. Instance page with launched EC2 Machine.
Figure2.9. Instance page with launched EC2 Machine.
  • Let’s check the security group is working or not. By using putty
  • EC2 instance that you have created and copy its “IP address”.
  • Past this IP address at “Host Name” in Putty.
Figure3.0. Shows where to past IP address.
Figure3.0. Shows where to past IP address.
  • Click on the “SSH category” appearing on the left side of the Putty.
  • Then click on the “Auth”.
Figure3.1. Auth.
Figure3.1. Auth.
  • Click on the “Browse” to open the PPK file.
  • Click on “Open”.
Figure3.2. Shows Putty Security Alert.
Figure3.2. Shows Putty Security Alert.
  • Click on “Yes”.
Figure3.3. Shows putty window.
Figure3.3. Shows putty window.
  • Give “ec2-user” command to connect to ec2 instance, and press “Enter”.
	Figure3.4. Shows we are connected to EC2 Instance.
Figure3.4. Shows we are connected to EC2 Instance.

Conclusion:

This way EC2 Inbound Outbound Rules can be used to control the traffic. However, We need to keep track of these rules. For instance, we should not allow 0.0.0.0/0 routes.

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