In linux, how does one achieve two ADSL instances simultaneously using the Internet for routing and load balancing?

In linux, how does one implement two ADSL networks simultaneously using the Internet for routing and load balancing-Linux Enterprise applications-Linux server application information? The following is a detailed description. Problem:
How does one implement two ADSL networks using the Internet for routing in linux?
I have two ADSL lines. to overlay the two lines, we 'd better use linux
Question added: I want to use one Intranet Nic and two Enis connected to ADSL (both are China Netcom's ADSL), with a total of three Enis; To achieve dual-line Internet access, when load balancing is achieved and a line is disconnected, the connection on this line is automatically placed on another line

Answer:
This is generally achieved through dual-nic binding in LINUX. The general process is

Configure your IP address, GATEWAY, MASK, and DNS on bond0 and add the content at the end of/etc/modules. conf.
Alias bond0 bonding
Options bonds miimon = 100 mode = 0
0 indicates that the load is HENG. If mode is set to 1, the load is only fault tolerant.