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:

       bashCopy codeip addr show

     • If necessary, request a valid IP address by renewing DHCP:

       bashCopy codesudo renew-dhcp

2. Disable systemd-resolved Service:

   • To free up Port 53 for FakeNet, disable the systemd-resolved service:

     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:

       bashCopy codesudo nano /etc/NetworkManager/NetworkManager.conf

     • Add the following line under the [main] section:

       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:

     bashCopy codesudo rm /etc/resolv.conf

   • Recreate resolv.conf as a symbolic link to the file generated by systemd-resolve:

     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:

     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:

     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):

       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:

       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.