AWS Service- Networks

 Networking:


Basic Networking: 


  • IP address 

2 types : 


 classful IPS and Classless IPs (ip 4) 


  1. Class full IPs:   

                                 8  8  8  8

  • class A  (1 - 126)      N H  H  H   10. 254 x 254 x 254 =  1 crore IPs 

                                 255 0 0 0


  • class B (128 - 191)    N N H  H    172.16. 254 x 254  = 64000

                                  255 255 0 0


  • class C (192 - 223)    N  N N H   192.168.1. 254 = 254 

                                  255 255 255 0


192.168.1.1/255.255.225.0 - inside machines 


192.168.1.0/24 -  (AWS) 


—-------------------------------------------

  • class D (224 - 239)   N N N N (research purpose) 

  • class E  (240 - 254)   N N N N 


N - network bit (constant)

 

H - host bit ( variable) 


If you are changing the constant even though it is in the same class, it is considered a different network 


132.16.17.1 - class B


  1. why 254


2^7 + 2^6 + 5 + 4 + 3 + 2 + 1 + 0



1+2+4+8+16+32+64+128 = 255 


  1. special numbers:


0 - a whole network


  1. public address and private address 


  1. limiting the IP address:


            Search online subnet calculator in google and define the IPs you want and configure the  

            the subnet in switch and machine level. 


  1. switch and router 


            switch - the same network to communicate with each other  


            router - different networks to communicate with each other 


  1. VLAN 


            dividing the switch is called VLAN


class less IP: 


  • class A - 10.0.0.0 = 1 crore 


  • class B - 172     = 64000 = 1 crore 


  • class C = 1 crore


CIDR - classless interdomain routing 


https://www.subnet-calculator.com/cidr.php

– Creating VPC:



  –  Virtual Private Cloud


  –  It chooses the entire IP address for your network or product


  – It allows only 5 VPC’s in the free tier  





– Creating Subnet:


     – Divides the VPC


     – for web subnets enable: Enable auto-assign public IPv4 address





– Creating Internet Gateway:


    – Not secure internet



– Creating Routetable:


    – Controls the internet service and share to a machine which needs internet





– Creating EC2 instance in WEB and DB server in Own VPC: 



– Launch web VPC server:



– Connect DB server using a web server in the same VPC:



– NAT GATEWAY(giving internet to private subnet):


  – Give temporary internet to IP’s which needed


  – create NAT gateway using web subnet then create a new Route table and add the Nat gateway 

      

      and associate the DB subnet

 



– Internet for DB Server:




– Endpoint:


  – Mainly for S3 access and some specific services


  – Not Full internet






– VPC Peering:


   – Connect two different VPC


Used in:


  – Same region


  – Across region


  – Different AWS account


  • Make sure that you are creating a different network. if we is having 10.0.0.0/21 then the 


another region should have 20.0.0.0/21 to avoid the same IP conflicts 


  • create peering connection in US region and add the India region VPC ID then accept the 


connectivity in India region 


  • go to the Route table and add the 20.0.0.0/21 IP in web associated Route table subnet



 

– (US region)

– (India region)

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