Layer 4 load balancers operate on the transport layer, using information defined at the networking transport layer as the basis for client request distribution decisions.

A Layer 4 load balancer delivers messages with no regard to the content of the message. Such load balancers only forward network packets to and from an upstream host without inspecting the content of the packets.

If you use a Layer 4 load balancer, the solution requires a load balanced Virtual IP address for each Cloud Proxy instance, with a specific override of its public fully qualified domain name (FQDN) to a specific one .

To override, you must add the following property to the /opt/vmware/vcloud-director.etc/global.properties file. cloudproxy.reverseconnection.fqdn = name.com:443

Layer 4 load balancing advantages

  • Better performance compared to Layer 7 load balancing. Layer 4 load balancers only use the network transport layer information, disregarding the content of the packages .

  • Better throughput.

Layer 4 load balancing disadvantages

  • You need multiple Virtual IP addresses.

  • You need multiple IP addresses.

  • You need multiple certificates.

  • You need multiple one member IP pools.