In azure we need to create private subnets which will not have access from internet, if you need access to internet we need to create a NAT Gateway.
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Network Interfaces
Ips are assigned to Network interfaces
AWS uses random allocation, where as azure uses sequential notation
In AWS the size of subnet
2^n - 5
For example, in a subnet with CIDR block 10.0.0.0/24, the following five IP addresses are reserved:
10.0.0.0: Network address.
10.0.0.1: Reserved by AWS for the VPC router.
10.0.0.2: Reserved by AWS. The IP address of the DNS server is the base of the VPC network range plus two. For VPCs with multiple CIDR blocks, the IP address of the DNS server is located in the primary CIDR. We also reserve the base of each subnet range plus two for all CIDR blocks in the VPC. For more information, see Amazon DNS server.
10.0.0.3: Reserved by AWS for future use.
10.0.0.255: Network broadcast address. We do not support broadcast in a VPC, therefore we reserve this address.
In Azure the size of subnet
2^n - 5
Yes. Azure reserves the first four addresses and the last address, for a total of five IP addresses within each subnet.
For example, the IP address range of 192.168.1.0/24 has the following reserved addresses:
192.168.1.0: Network address.
192.168.1.1: Reserved by Azure for the default gateway.
192.168.1.2, 192.168.1.3: Reserved by Azure to map the Azure DNS IP addresses to the virtual network space.
192.168.1.255: Network broadcast address.
Exercise: try to find the smallest subnet and largest subnet in AWs and Azure
Reserve a static ip address (private) for an vm in azure/Aws
Create a network interface with static ip and attach it to vm/ec2
DNS Name For VMs/EC2
In AWS if we create an ec2 instance
in default vpc
we get public dns name if public ip is enabled
we get private dns name
in custom vpc
we get private dns name
To get public ip by default we need to configure this with enable dns hostnames => true in vpc
In Azure we need to enable dns prefixes for public dns and private dns is machine name.
Purpose of DNS
DNS servers will have records to
map name to ip address
map alias names
show mail server informat
show metadata.
For doing this DNS servers maintain records. Record types of DNS
