I am not sure this will help you, but as far as I know (after reading the User Guide for Multi-WAN
), I found this:
To give you an example of how multi-WAN works, imagine two 1 Mbit/s DSL lines with two users on the local network. With every new connection to a server on the Internet, the multi-WAN system alternates WAN interfaces. User A could be downloading a large file through WAN #1, while User B is making a voice-over-IP (VoIP) telephone call on WAN #2.
With some applications, the download speed for the multi-WAN system can use the full 2 Mbit/s available. For example, downloading a large file from a peer-to-peer network will use the bandwidth from both WAN connections simultaneously. This is possible since the peer-to-peer technology uses many different Internet “peers” for downloading. At the other end of the spectrum, consider the case of downloading a large file from a web site. In this case, only a single WAN connection is used – 1 Mbit/s maximum.
I am no expert at this, but it looks like it means that depending on the type of download, the user / client will be able to use 1 or more WAN connections.
There must be someone out there that has more experience with this sort of thing so I advise you to wait for at least one second opinion.