Load balancing, – bridging – network shares.
This gets very complicated very quickly.
A – If you have an existing LAN connection, is it 10 or 100, half or full. Optimize this connection first. If it is embedded, try a ‘smart’ NIC that does some of the processing for you.
B – Peer-2-peer or workgroup or domain? Is ‘File/Printer sharing turned on and why? Multiple IP addresses, especially from different subnets can cause your system to ‘disappear’ from the network, Name resolution problems, vastly increased login times, and possible total system lockup. Be cautious when setting binding order for protocols and adatpters.
C – Processor speed, RAM, HD and interface, Is network spped/bandwidth the major limiting factor.
D – What are you trying to download? Up to 25 MB (i.e. xrays) the limit can be local system. Above that size the factors are usually the gateway, facility pipe size, community pipe size. Depending on where you are 400k is quite respecatable.
E – Most schemes to combine IP sources are for fall-over. If one fails the other takes over. True load balancing will require matching NIC’s and careful system setup. Good luck