IP Addresses for Resources in GCP

• GCP IP Addressing
• There are two types of IP Addresses
  • Internal Address
    • Assigned from the subnet range using internal DHCP pool
    • IP Addressing can be further classified into
      • Ephemeral : This will still remain even after vm is stoppedd
      • Static Ip Address: Can be assigned to any ip in the subnet range
    • Internal DNS Format is assigned (FQDN): (instance-name).c.(project-id).intenral
  • External Address
    • Assigned to be access from internet
    • IP Addressing can be further classified into
      • Ephemeral: This changes when you stop the vm i.e. the ip address is released and when you start the vm you will get a new external ip address
      • Static Ip Address: We can reserve the Static ip and this will remain the same across vm starts and stops.
    • No default public DNS, need to use DNS Services like Cloud DNS
• Multiple Network Interface Controllers (NIC):
  • VMs can have exactly one internal and external IP per VPC
  • VM can have multiple network interfaces (one per vpc) with external and internal ip addresses
  • Restrictions:
    • 1 NIC per network
    • Two networks cannot have overlapping subnet ranges
    • Maximum of 8 NICs can be assigned to VM
      • less than or equal to 2 VCPUs = 2 NICS
      • grater than 2 CPUs => 1 NIC per CPU
  • NIC’s can be assigned only during vm creation

Exercise:

• Create a custom vpc with two subnets
  • name: vpca
  • us-central1 : 192.168.0.0/24
  • us-east1: 192.168.1.0/24
• Create a custom vpc with two subnets
  • name: vpcb
  • us-central1 : 10.168.0.0/24
  • us-east1: 10.168.1.0/24
• Now lets create a compute engine instance in any of the vpc’s
• We can continue instance creation but lets add one more network interface from different vpc

Next Steps:

• Understanding firewalls
• Understanding Routes