Network Load Balancer (NLB)
- Network traffic is load balanced at
Layer 4 of the OSI model
- v2 (2017)
- High performance (millions of requests per second)
- 100ms latency (400ms in ALB)
Static IPs
- You are able to allocate
static IPs (EIPs) with NLBs/ Differently from ALB that provides only the hostname
- NLB must be internet facing to get an
EIP
- Use the command
aws ec2 allocate-address to allocate (create) Elastic IP addresses
- You need to provide 1 EIP for each AZ (each subnet in each AZ) in which the LB is deployed
- To associate the EIPs with the ENIs of the LB use the command
aws ec2 associate-address
Protocols
Security
- There is no termination in NLB, the request simply
pass through
- There's no SG for NLB. This way, the only network security is the VPC NACL
Health Checks
- Supports L4 (e.g., tcp) and L7 protocols (e.g., http)