049 ip

Networking has two sorts of IPs

• IPv4: 3.7 billion addresses
• IPv6: for Internet of Things

Private vs Public IP (IPv4)

Public:

• the machine can be identified on the internet
• must be unique across web
• can be geo-located easily

Private:

• the machine can be identified on a private network only
• the ip must be unique across private network
• www -> internet gateway (proxy) -> machine
• there is dedicated range of IP for private IP

Elastic IPs

• If you need to have a fixed public IP for EC2, you need Elastic IP.
• You can only have 5 Elastic IP in younr account
• Try to avoid using Elastic IP
  • use a random public IP and register a DNS to it
  • or use Load Balancer

IP in AWS EC2

If your machine is stopped and then restarted, the public IP will change.