Cisco Cisco IOS Software Release 12.2(18)SXD

Static NAT with a specified address—The real server is configured to use a user-specified virtual IP 
address when translating addresses.

Static NAT with per-packet server load balancing—The real server is configured such that IOS SLB 
is not to maintain connection state for packets originating from the real server. That is, IOS SLB is 
to use server NAT to redirect packets originating from the real server. Per-packet server load 
balancing is especially useful for DNS load balancing. IOS SLB uses DNS probes to detect failures 
in the per-packet server load-balancing environment.

Static NAT with sticky connections—The real server is configured such that IOS SLB is not to 
maintain connection state for packets originating from the real server, unless those packets match a 
sticky object:

If IOS SLB finds a matching sticky object, it builds the connection.

If IOS SLB does not find a matching sticky object, it forwards the packets without building the 
connection.