AWS Classroom notes 27/Oct/2023

Route Tables

  • Route tables act as router.
  • By default we will a have default route table.
  • Subnets can be associated with route table, if not associated then default route table will be used for routing
  • When we are using any ranges in security groups or NACL or Route tables restrictions can be applied on basis of network id
    • Specific Ranges
    • Any Ip Address
    • Specific IP Address
# Specific Range => 10.0.x.x
# Any IP => x.x.x.x
# Specific IP

  • Default Routes in Route table: All the communication within vpc is routable
  • Connection to Internet gateway
  • Lets add a route to forward packets to internet gateway
  • For demonstrations refer classroom

Lets create public and private subnets

  • Your application has three layers
    • web
    • app
    • db
  • Only web should be exposed to internet
  • We have six subnets
    • web1
    • web2
    • app1
    • app2
    • db1
    • db2
  • We have create the internet gateways
  • Lets create two route tables

    • public: will be associated with subnets web1, web2 and will have route to internet gateway
    • private: will be associated with other subnets and will not have route to internet gateway
  • web1, web2 are public subnets as they have route to internet
  • app1, app2, db1, db2 are private subnets as they dont have route to internet
  • Exercise:

    • Create a vpc with 4 subnets
      • web
      • app
      • mgmt
      • db
    • Only mgmt subnet should be public, rest of the subnets should be private
    • Create an ec2 instance in mgmt and web
    • Try to connect to ec2 in web from your system and check if it is getting internet or not

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