Ubuntu dual-line dual-network card dual-IP configuration method

Ubuntu dual-line dual-network card dual-IP configuration method requires specific code examples

Ubuntu is a popular open source operating system that can be used in desktop and server environments. Configuring dual lines, dual network cards and dual IP can achieve network load balancing and redundancy backup, improving network reliability and performance. This article will introduce how to configure dual-line dual-network card dual-IP in Ubuntu system and provide specific code examples.

First, we need to check the network card devices available in the system. Open the terminal and run the following command:

$ ifconfig -a

This command will display all network card device information in the current system, for example:

eth0      Link encap:Ethernet  HWaddr 08:00:27:b8:92:fa  
          inet addr:192.168.1.100  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:feb8:92fa/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1184 (1.1 KB)  TX bytes:1184 (1.1 KB)

In the above example, we can see that there are two There are two network card devices, one is eth0 and the other is lo (local loopback device).

Next, we need to edit the network configuration file to configure dual-line dual-network card dual-IP. Run the following command to open the network configuration file:

$ sudo nano /etc/network/interfaces

In the file, we can see the existing network configuration information. We need to add two new configuration sections to configure the IP address of the second network card device.

Suppose we want to configure the IP address of the second network card device to 192.168.1.101 and the subnet mask to 255.255.255.0. Add the following to the end of the file:

auto eth1
iface eth1 inet static
  address 192.168.1.101
  netmask 255.255.255.0

Save the file and exit the editor.

Next, we need to restart the network service for the configuration to take effect. Run the following command to restart the network service:

$ sudo systemctl restart networking

Now, we have successfully configured dual-line dual-network card dual-IP. We can use the following command to view the configuration information of the network card device again:

$ ifconfig -a

You should be able to see that eth1 has successfully configured an IP address.

Next, we will provide an example of a Python script to implement network load balancing with dual lines, dual network cards, and dual IPs. Make sure you have Python installed, then create a new file and add the following code to the file:

import subprocess

def set_default_gateway(interface):
    subprocess.call(f'sudo ip route del default', shell=True)
    subprocess.call(f'sudo ip route add default scope global dev {interface}', shell=True)

def set_load_balancing(interface1, interface2):
    subprocess.call(f'sudo ip route add default scope global nexthop via $(sudo ip route show dev {interface1} | grep -Po "default via KS+") weight 1 nexthop via $(sudo ip route show dev {interface2} | grep -Po "default via KS+") weight 1', shell=True)

if __name__ == "__main__":
    set_default_gateway("eth0")
    set_load_balancing("eth0", "eth1")

Save the file and exit. Then run the following command in the terminal to execute the Python script:

$ python3 <文件名>.py

The above code will set the first network card device (eth0) as the default gateway and route the traffic between the first and second network card devices Perform load balancing.

In this article, we introduce the method of configuring dual-line dual-network card dual-IP in Ubuntu system and provide specific code examples. Through these steps, you can configure dual-line dual-network card dual-IP into your Ubuntu system to achieve network load balancing and redundant backup.

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