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I am really not clear what outbound(egress) and inbound(ingress) traffic means. I have two theories

  1. inbound just specifies that the origin is outside and target inside i.e. HTTP round trip to some VM hosted web is ingress, the response with HTTP 200 status goes the same established route back

  2. inbound is anything from internet and outbound is anything to internet. So HTTP roundtrip to azure VM is ingress and also egress (HTTP response), both of which can have different route(in case of asymmetric routing.

My question is if the VM does not have route back to internet, will it serve properly the HTTP or the response cannot reach the originator in internet?

Zveratko
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1 Answers1

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Inbound traffic originates from outside the network, while outbound traffic originates inside the network.

My question is if the VM does not have route back to internet, will it serve properly the HTTP or the response cannot reach the originator in internet?

Assuming you have a web server running on it, you just need to configure on firewall rules to enable inbound / outbound traffic for port 80 and 443

Thiago Custodio
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    So I need to enable outbound to send out responses to HTTP GET? – Zveratko Mar 19 '22 at 14:33
  • For example here they say packet for inbound traffic are routed differently "Because all the outbound and inbound connections to the AKS clusters are now going through the Azure firewall, it creates a problem called “Asymmetric routing”. This problem occurs when a packet takes one route to its destination and then a different one when returning to the source. Incoming traffic uses the public IP address because you’re using the public load balancer, but on return, the private IP from the firewall is used instead.". So it is still not clear to me. – Zveratko Mar 23 '22 at 05:46