Application Gateway
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Backend pools - configure backend vm ip
Health Probs - create a health check url (the url has to give some status code inbetween 200-399)
HTTP settings - configure all the exposed port from backend vm and add Health Probs If needed
Frontend Ip Configuration - configure DNS/Public IP
Listners - configure http(80) or https (443) listeners and add pfx ssl cert
Rules - connect listeners —BackendPools—HttpSettings or setup any redirection rules
vnet ip range - 10.0.0.0/16
snet01 - 10.0.0.0/24
snet02 - 10.0.1.0/24
snet03 - 10.0.2.0/24
snet04 - 10.0.3.0/24