Zackarias,

That depends upon exactly what you mean by "balanced." If you have multiple TCP connections and simply want to round robin those connections across two different ISP WAN links then ClearOS, at least the newer version(s), has a MultiWan app that I believe should do the trick. (I haven't worked with it much myself. So I'm not 100% sure what it can do, but I believe it should accomplish this goal.)

So if you have multiple hosts behind your ClearOS box and are simply trying to allow multiple TCP connections from all these hosts to be spread out across your two ISP WAN links then I believe the MultiWan app is what you'd want to use.

In my case I'm trying to increase my upload speed by "bonding" two WAN links together to effectively double my speed for a file transfer application. In my case only a single TCP connection is involved and I haven't found a successful solution on how to make this work. I've created two OpenVPN tunnels between my client, which has two WAN links, and the server, which has a single WAN link, but haven't been successful at bonding the two VPN tunnels to behave as a single TCP connection.

Even if it were possible to use MultiWan and round robin all packets for a TCP (or UDP) application because you'd likely be using NAT to the far end it would appear as though the packets were originating from two different hosts and thus your communication would not function properly.

Another relatively inexpensive option is that TP-Link makes some routers that allow you to connect multiple WAN links (on the low end routers I believe you an have 4 WAN links). From the point of view of the hosts on your LAN network it appears as though you have a single connection to the Internet, but the TCP connections can be configured to round robin across the available WAN links and effectively double, triple, or quadruple your performance.