NetScaler appliance performs load balancing, it creates and maintains sessions
between clients and servers. The maintenance of session information places a
significant load on the NetScaler resources, and sessions might not be needed
in scenarios such as a direct server return (DSR) setup and the load balancing
of intrusion detection systems (IDS). To avoid creating sessions when they are
not necessary, you can configure a virtual server on the appliance for
sessionless load balancing. In sessionless load balancing, the appliance
carries out load balancing on a per-packet basis.
balancing can operate in MAC-based forwarding mode
or IP-based forwarding mode.
forwarding, the IP address of the sessionless virtual server must be specified
on all the physical servers to which the traffic is forwarded.
IP-based forwarding in sessionless load balancing, the IP address and port of
the virtual server need not be specified on the physical servers, because this
information is included in the forwarded packets. When forwarding a packet from
the client to the physical server, the appliance leaves client details such as
IP address and port unchanged and adds the IP address and port of the