What are network interface modules in AWS infrastructure?

Network interface modules in AWS infrastructure refer to Elastic Network Interfaces (ENIs) and related networking components that allow EC2 instances and other services to communicate within a VPC. They provide network connectivity, IP addressing, and traffic routing capabilities.

What is an Elastic Network Interface (ENI) in AWS?

An Elastic Network Interface (ENI) is a virtual network interface that you can attach to EC2 instances in a VPC. It includes a primary private IPv4 address, MAC address, security groups, and a source/destination check flag. ENIs can be detached and reattached to different instances.

How many network interfaces can an AWS EC2 instance have?

The number of network interfaces an EC2 instance can have depends on the instance type. For example, a t2.micro can have up to 2 ENIs, while larger instances like c5.18xlarge can have up to 15 ENIs. Each ENI can have multiple private IP addresses.

What are the use cases for multiple ENIs on an AWS instance?

Multiple ENIs on an AWS instance are useful for network and security appliances, low-budget high-availability solutions, creating dual-homed instances with separate subnets, and management network separation. They allow you to create separate network paths for management and application traffic.

AWS Elastic Network Interface (ENI): Deep Dive & Enhanced Networking

November 18, 2020 / Nirav Shah

Deep Dive: AWS Network Interface Modules & Infrastructure Overview

Elastic Network Interface is an essentially a virtual network card. A virtual network card (ENI in this scenario) is automatically attached to your EC2 instance when you provision one.

It basically allows a primary private IPv4 address, from the IPv4 address range of your VPC.

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And it also allows one or more secondary private IPv4 addresses from the IPv4 address range of your VPC. With an ENI you get one elastic IP address, per private IPv4 address. And your ENI will have one or more security groups through which you can get a MAC address as well.

What Is an AWS Elastic Network Interface (ENI)? Complete Explanation

Enhanced Networking Interface uses what’s called single root I/O virtualization or SR-IOV, to provide high-performance networking capabilities to the supported instance types.SR-IOV is a method of device virtualization, that provides higher IO performance and lower CPU utilization,

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How to Enable Enhanced Networking on AWS: 2 Methods Explained

Enhanced Networking is required for higher bandwidth, a higher number of packets per second performance. So depending on your instance type, Enhanced Networking can be enabled using two methodologies:

1. Elastic Fabric Adapter

It supports network speeds of up to 100 gigabits per second for supported instance types.

2. Intel 82599 Virtual Function, or VF interface

Which supports network speeds of up to 10 gigabits per second, for supported instance types (like C3, C4, D2, I2, M4 (excluding m4. 16xlarge).

Elastic Fabric Adapter

It is a network device that you attach to your EC2 instance to accelerate High-Performance Compute, mostly used in the machine learning applications. (P instance family type)

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EFA will use OS-bypass. It enables high performance-compute and machine learning applications to bypass the operating system kernel and to communicate directly with the EFA device. It makes it a lot faster with a lot lower latency.

Note: It’s not supported on Windows currently, it’s only supported with Linux.

Monitoring an AWS Infrastructure

FAQs:

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Nirav Shah

Nirav Shah is the Director of Eternal Web Pvt Ltd, an AWS Advanced Consulting Partner and certified Odoo Partner based in the UK. With over a decade of experience in cloud computing, digital transformation, and ERP implementation, Nirav helps enterprises adopt the right technology to solve complex business challenges. He specialises in AWS infrastructure, Odoo ERP, and web development solutions for businesses across the UK and beyond.