# Setting Up and Configuring FakeNet in REMnux

**Issue: FakeNet Fails to Run Due to Port Conflict**

1. **Error Encountered**:
   * Upon running FakeNet, an error with code **98** might occur, indicating that the address (Port 53, DNS port) is already in use.
2. **Root Cause**:
   * The error is due to the **systemd-resolved** service holding Port 53, which FakeNet also needs to use.

**Steps to Resolve Port Conflict and Configure FakeNet**

1. **Verify Network Route**:
   * Ensure a valid network route is established:
     * **Ping an Internet Address** to verify connectivity.
     * If there are no responses, check and configure your VM network settings. The default setting is usually **NAT mode**.
     * Check the system's IP address using the `ip` command:

       ```bash
       bashCopy codeip addr show
       ```
     * If necessary, request a valid IP address by renewing DHCP:

       ```bash
       bashCopy codesudo renew-dhcp
       ```
2. **Disable `systemd-resolved` Service**:
   * To free up Port 53 for FakeNet, disable the `systemd-resolved` service:

     ```bash
     bashCopy codesudo systemctl stop systemd-resolved
     sudo systemctl disable systemd-resolved
     ```
3. **Edit Network Manager Configuration**:
   * Modify the Network Manager's configuration file:
     * Open the file for editing:

       ```bash
       bashCopy codesudo nano /etc/NetworkManager/NetworkManager.conf
       ```
     * Add the following line under the `[main]` section:

       ```bash
       bashCopy codedns=default
       ```
     * Save the changes (Ctrl + X, then Y, and press Enter).
4. **Recreate the `resolv.conf` File**:
   * **Delete the existing `resolv.conf` file**:

     ```bash
     bashCopy codesudo rm /etc/resolv.conf
     ```
   * **Recreate `resolv.conf` as a symbolic link** to the file generated by `systemd-resolve`:

     ```bash
     bashCopy codesudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
     ```
5. **Restart Network Manager Service**:
   * Reboot the system or restart the Network Manager service to apply the changes:

     ```bash
     bashCopy codesudo systemctl restart NetworkManager
     ```
   * **Verify Internet Connection**: Ping an address to ensure connectivity wasn't disrupted.
6. **Run FakeNet**:
   * After resolving the port conflict and network issues, you can now run FakeNet:

     ```bash
     bashCopy codesudo fakenet
     ```
   * **Test FakeNet**:
     * Visit any website to check if it returns FakeNet's default page.

**Handling the Multi-Host Network Mode Issue**

1. **Default Behavior**:
   * In Linux, FakeNet defaults to **multi-host mode**, which may cause it to only log requests without responding with fake data.
2. **Solution: Change to Single Host Mode**:
   * To change the network mode to **single host**:
     * Open the configuration file (`default.ini`):

       ```bash
       bashCopy codesudo nano /usr/local/lib/python2.7/dist-packages/fakenet/configs/default.ini
       ```
     * Locate the `network_mode` field and set it to `single_host`:

       ```bash
       bashCopy codenetwork_mode = single_host
       ```
     * Save and close the file.
3. **Rerun FakeNet**:
   * Run FakeNet again and test by visiting a website to see if it now properly returns FakeNet's default page.
4. **Exiting FakeNet**:
   * To exit FakeNet, press **Ctrl + C**.