With the server load balancing function you can distribute incoming connections (e.g., SMTPSimple Mail Transfer Protocol or HTTPHypertext Transfer Protocol traffic) to several servers behind the gateway. Balancing is based on the source IP address with a persistence time of one hour. If the interval between two requests from the same source IPInternet Protocol address exceeds that interval, the balancing is redecided. The traffic distribution is based on a simple round-robin algorithm.
All servers from the server pool are monitored either by ICMPInternet Control Message Protocol ping, TCPTransmission Control Protocol connection establishment, or HTTP/S requests. In case of a failure the affected server is not used anymore for distribution, any possible source IP persistence is overruled.