BalanceNG is an IP load software balancing solution.

BalanceNG (Balance Next Generation) is an IP load software balancing solution utilising its own network stacks and functionality. It runs on Linux-x86 (2.4 and 2.6 kernels distribution independent) and Solaris (9/10).

General Features:
- Layer 2 (Ethernet) "switching engine" based software load balancer.
- Running under Linux (Using the PF_PACKET socket API) and Solaris (STREAMS/DLPI API).
- Backup targets (hosts) specifiable in case of failure of all primary targets.
- "Alert" and "Upalert" notification script interface.
- Direct Server Return (DSR) operation support.
- Unchanged client addresses on IP-level.
- Small, very fast and reliable.
- Simple to implement and administer.
- Simple "init script style" arguments like "start", "stop" and "status" (and "control" for interactive configuration and control ).
- Interactive communications mode with command line editing.
- Pcap packet dumping with automated dumpfile rotation (e.g. to implement a "transparent forensic logging bridge").
- Multi-Node High Availability capability using standard VRRP (Virtual Router Redundancy Protocol).
- "All service load balancing" based on client IP address allows generic load balancing independent of specific ports.
- SNMP support integrating into Net-SNMP with the BalanceNG MIB.
- Up to 128 parallel instances (fully independent BalanceNG load balancers) on the same host machine.
- Up to 1024 load balancing target servers (hard limit) per instance.
- Up to 512 virtual servers (hard limit) per instance.
- NAT state replication between master and backup node.
- VRRP tracking supported to allow automatic resource tracking and failover.