Download change default gateway

Changing the default gateway in Ubuntu 20 is a fundamental aspect of network configuration. Whether you are managing a server or a local workstation, understanding how to modify the default gateway is essential for maintaining a seamless network connection. This guide will walk you through the steps to change the default gateway on Ubuntu 20, while also highlighting the importance of API calls, the use of Kong as an API gateway, the concept of Open Platform, and Routing Rewrite.Before we delve into the steps involved in changing the default gateway, it’s important to understand the significance of the default gateway. The default gateway serves as the main access point for your machine to communicate with devices outside of your local network. If you do not correctly configure the default gateway, your machine will be unable to connect to the internet or other external networks.The default gateway is typically a router on the network, and it directs packets that are destined for outside the local subnet. Here are some reasons why you might want to change the default gateway:Network Reconfiguration: If you are moving to a new network or have changed your network configuration, you may need to update the default gateway to reflect this change.Performance Improvements: Changing the gateway can help optimize performance by connecting to a more efficient route for your data packets.Issue Troubleshooting: Sometimes, a default gateway can become unresponsive, necessitating a change to restore connection reliability.Pre-requisites for the Gateway ChangeEnsure you have the following before proceeding with the changes:Administrative access to the Ubuntu machine.Basic familiarity with using the terminal.Relevant IP address information of your new network gateway.Step-by-Step Guide on How to Change the Default Gateway on Ubuntu 20Step 1: Open the TerminalTo change the default gateway, you will need to access the terminal. You can do this by pressing Ctrl + Alt + T on your keyboard or searching for “Terminal” in the application menu.Step 2: View Current Network ConfigurationBefore making any changes, it’s good practice to check your existing network configuration. You can do this by executing the following command:ip route showThis command will display the

Current routing table, including the default gateway. Look for a line that starts with default via, which indicates the current default gateway.Step 3: Change the Default GatewayTo change the default gateway, you can use the ip command. The syntax to set a new default gateway is as follows:sudo ip route add default via [NEW_GATEWAY_IP]Replace [NEW_GATEWAY_IP] with the IP address of your new gateway. For example, if your new gateway IP is 192.168.1.1, you would run:sudo ip route add default via 192.168.1.1Step 4: Verify the ChangeAfter making the change, it is crucial to verify that it was successful. Run the ip route show command again to confirm that the default gateway has been updated. You should now see the new gateway listed.Step 5: Make the Changes PermanentThe above changes will not persist after a reboot. To make them permanent, you can edit the Netplan configuration file. Open the file in a text editor with the following command:sudo nano /etc/netplan/01-netcfg.yamlIn this file, locate the configuration section for your network interface (usually named eth0, ens33, etc.) and add or modify the gateway4 entry to reflect your new gateway. The format should look like this:network: version: 2 ethernets: eth0: # (or your interface name) addresses: - 192.168.1.10/24 gateway4: 192.168.1.1 # new default gatewayMake sure to replace the IP addresses with your actual network interface’s IP address and the new gateway IP.Step 6: Apply the ChangesAfter editing the configuration file, apply the changes using the following command:sudo netplan applyThis will apply the new network configuration, including your updated default gateway.Troubleshooting Common IssuesIn case you encounter connectivity issues after changing the default gateway:Check Network Cables: Ensure that physical connections are intact.Firewall Settings: Adjust firewall settings if they are blocking traffic.DNS Configuration: Verify that your DNS settings are correct for external access.Incorporating APIs into Your RoutingAs we move deeper into networking, it’s important to consider the role of APIs and tools like Kong in modern infrastructures. API calls allow applications to communicate with each other and can be instrumental in managing data flow. Below is an overview of how you can utilize APIs, specifically focusing on Kong

The system reports which entry in the HAT matched from the remote IP address and remote domain name you entered. You can see the default mail flow policies and sender groups and which one matched the given entries. If the email gateway was configured to reject the connection (either through a REJECT or TCPREFUSE access rule), the trace command exits at the point in the processing. For more information on setting HAT parameters, see Understanding Predefined Sender Groups and Mail Flow Policies. Envelope Sender Address Processing These sections summarize how the email gateway configuration affects the Envelope Sender you supply. (That is, how the MAIL FROM command would be interpreted by the configuration of the email gateway.) The trace command prints “Processing MAIL FROM:” before this section. Default Domain If you specified that a listener to change the default sender domain of messages it receives, any change to the Envelope Sender is printed in this section. For more information, see Configuring the Gateway to Receive Email . Masquerading If you specified that the Envelope Sender of a message should be transformed, the change is noted here. You enable masquerading for the Envelope Sender on private listeners using the listenerconfig -> edit -> masquerade -> config subcommands. For more information, see Configuring Routing and Delivery Features. Envelope Recipient Processing These sections summarize how the email gateway affects the Envelope Recipients you supply. (That is, how the RCPT TO command would be interpreted by the configuration of the email gateway.) The trace