Why do we have to add Internet Gateway into the Route Tables to receive the internet traffic?

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Route tables describe the destination of packets from within a VPC, so why does a route table have to include an internet gateway when the internet gateway is itself a source of the packet and the destination is the public or elastic IPs within the VPC?

Jun 7, 2018 in AWS by shubham
• 6,890 points
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1 answer to this question.

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Because almost every useful internet connection is bidirectional. TCP/IP connections require several packets back and forth before a connection is established and even if, abstractly, all of the data is going one way, there's a flow of acknowledgement packets returning to the sender. This isn't the case with UDP/IP, but I don't know exactly what traffic you're trying to send back-end forth. One thing you could try is to install tcpdump (or similar) on the instance and see if it receives the packets. (It is possible to do this without the AWS IGW, however, it will require a second VPC, VPC peering, and a bit of clever network configuration.)
answered Jun 7, 2018 by Cloud gunner
• 4,260 points

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