Internet Gateways and Route Tables
Video Activity
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Time
19 hours 19 minutes
Difficulty
Intermediate
CEU/CPE
20
Video Transcription
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>> Hey, everybody. Welcome back.
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In this lecture, we're going to be talking about
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Internet gateways and route tables.
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The learning objectives are going to be
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to describe Internet gateways
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as a service and help you understand why it's applicable,
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why we want to use this whenever we're working with VPCs.
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Internet gateways allow for
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the network translation of your EC2 instances,
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which would typically be private.
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They're not going to be accessible to the world wide web.
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There's couple of things you have to do in
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order to allow that to happen.
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One of them being in the security groups,
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which we talked about in the EC2 module.
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But another one is
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having an IGW or an Internet gateway in
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your VPC to allow
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that communication to flow from
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your public subnet to the Internet.
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If we talk about an example here,
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we have a public subnet and we have
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a private subnet inside your VPC, which is common.
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Typically, databases going the private subnet.
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They communicate to the public subnet,
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which maybe has a web server or something like that,
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and then that web server is
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going to be accessible to the world wide web.
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The way that you're going to have to do this is you have
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two subnets sitting inside your VPC.
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You have an Internet gateway
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which has been assigned and turned on for that VPC.
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Remember, you can only have one Internet gateway per VPC.
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Then you're going to have to establish
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a route table and point
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the EC2 instance that is located in your public subnet.
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You have a route table
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for your EC2 instance in your public subnet.
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That is going to have to connect to the router,
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which is connecting to the Internet gateway,
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which allows for communication out to
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the world wide web. That's it.
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That's really all there is to it.
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Internet gateways allow for this and in order for you
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to have an EC2 instance access the world wide web,
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you've got to setup an Internet gateway
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and you have to establish that route table
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to allow that to happen and really, that's it.
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In this lesson, we talked about internet gateways.
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Hopefully, you understand the purpose for this.
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This allows for that communication for anything
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outside of your VPC to access
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the Internet and vice-versa
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and what you have to do to allow this to happen.
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If you have any questions, feel free to reach out to me
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and if not, I'll see you in the next lesson.
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