Subnet (Shared Load Balancers)
Frontend Subnet
Shared load balancers support private IPv4 networks by default.
The system assigns IPv4 private addresses in this subnet to load balancers for receiving requests.
Backend Subnet
Shared load balancers are deployed in clusters, so you cannot specify backend subnets.
FAQ
Can I Change the VPC and Subnet for My Load Balancer?
You cannot change the VPC and subnet for your shared load balancers, but you can change the subnet for your dedicated load balancers.
When backend servers receive requests from the load balancer, source IP addresses are translated into those in 100.125.0.0/16. To ensure normal communications between the load balancer and backend servers, ensure that security group rules allow traffic from the IP addresses in 100.125.0.0/16 to backend servers. For details, see Configuring Security Group Rules for Backend Servers (Shared Load Balancers).
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