We all know that health checks are a very useful tool for making sure that AWS services such as AWS ELB and Amazon Route 53 know the state of their targets before forwarding traffic to them. In this section, we will take a look at ELB health checks and Route 53 health checks, and compare them with one another.
Interface Endpoint Gateway Endpoint Gateway Load Balancer Endpoint An elastic network interface with a private IP address that serves as an entry point for traffic destined to a supported AWS service, endpoint service, or AWS Marketplace service. For each interface endpoint, you can choose only one subnet per Availability Zone. Endpoints are regional, which means they are only usable within the same region they are created in. Since interface endpoints use ENIs, they also use security groups to control traffic. Can be accessed through AWS VPN connections or AWS Direct Connect connections, through intra-region VPC peering connections from Nitro instances, [...]
What is MTU? MTU (maximum transmission unit) is the maximum size of one packet of data that can be transferred in a network. The default MTU size for Ethernet devices is 1500 bytes. This packet size contains the actual payload data as well as network overhead information needed for communication within the network. All AWS EC2 instances support the default MTU size. But many current instance sizes support 9001 MTU, also referred to as jumbo frames. Enabling jumbo frames for supported EC2 instances can be beneficial because it improves network efficiency by allowing your instance to send fewer packets with [...]
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