Lenovo brand machine can complete switching after installing the multiple isolation card, but it can't access the external network. It changed a lot, all the same. Please raise your finger!

Please explain the situation in as much detail as possible. This shows that there is nothing wrong with the isolation card. If it can be switched normally, there is no problem with the installation method. You can't access the external network. You should carefully look at the network, whether it is a single line or a double line:

If it is a single connection, first of all, it depends on whether the jumper at the corresponding port of the control switch is inserted into the external network switch and whether the jumper can be connected. In addition, pay attention to whether the network between the isolation card and the control switch is fully connected with 8 cores. If 7.8, one of the two lines can't be connected, this problem will also occur.

If it's a double line, it's easy. Let's see if the external network is connected, and if we can surf the Internet only by plugging in the computer.

Finally, be sure to pay attention to whether the port of the isolation card and the corresponding network cable are inserted correctly. You can communicate again if you have any questions. Hey, I can do this.