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How to connect two network through two LAN cards?

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First of all, do you have DHCP configured in both Routers?

Are the two routers set for same IP address?

Bridging does not apply in this case.

If you have two routers going to two ISPs, or even two routers going to the same ISP, you cannot aggregate the bandwidth of the two devices by connecting them to the same LAN.

TCP/IP, for most common applications, such as a web browser, requires ONE route to be active at a time, so making two network connections to two different routers forces Windows to choose the faster link (routing metric) and therefore establishes the default route to that faster connection, and disables the second one.

What you need is a dual-wan router which allows the LAN to have access to a primary and failover ISP connection (failover), as well as direct certain users to a less lightly loaded WAN connection (load balancing).

Of course, if you go to all the trouble and cost of a multi-wan router, why not just buy a faster link in the first place?

It's not possible to do link aggregation between multiple ISPs, since it's not possible for normal TCP/IP connections to follow multiple paths with different routes back to your workstation. While it's true that certain applications such as Torrent apps can use multiple paths, they do this by establishing multiple connections. But I digress...