Troubleshooting Mobile Device Connected to Kali Linux 2024.2 Hotspot with No Internet Access

Introduction

This article aims to help users who encounter issues with mobile devices not having internet access when connected to a Kali Linux 2024.2 hotspot. The following context covers key concepts, subtopics, and solutions to this problem.

Context

We assume the user has a Kali Linux 2024.2 desktop computer that gets an internet connection (eth1). The user creates a hotspot to connect their mobile device, but the mobile device fails to access the internet.

Prerequisites

To follow the steps below, make sure you have:

• A Kali Linux 2024.2 desktop computer with an internet connection (eth1)
• A mobile device to connect to the Kali Linux hotspot

Solution

Several reasons might cause the issue of mobile devices not having internet access when connected to a Kali Linux 2024.2 hotspot. In this section, we'll discuss some common causes and their solutions.

Wrong ESSID

One possible reason for the issue is that the mobile device is connected to a different network with the same name (ESSID). To solve this:

1. On the Kali Linux desktop, run:
sudo iwconfig wlan0 essid "Your_Hotspot_Name"

Replace "Your_Hotspot_Name" with the name of your hotspot.

2. On the mobile device, forget the old network and connect to the new hotspot.

Wrong Password

Another reason could be an incorrect password. To check:

1. On the Kali Linux desktop, run:
sudo iwconfig wlan0

Check the "Key Management" section for the password.

2. On the mobile device, make sure the password is correct.

DHCP Issue

A DHCP (Dynamic Host Configuration Protocol) issue might prevent the mobile device from obtaining an IP address. To troubleshoot:

1. On the Kali Linux desktop, run:
sudo dhcpcd7 -d

This will start the DHCP server in debug mode.

2. Connect the mobile device to the hotspot and check the debug output for any issues.
3. If necessary, configure a static IP address on the Kali Linux hotspot:
sudo nano /etc/network/interfaces.d/wlan0-static # Replace the following lines with your desired IP address and subnet mask: address 192.168.42.1 netmask 255.255.255.0 gateway 192.168.42.1 # Save and exit the file. sudo ifdown wlan0 sudo ifup wlan0

iptables

iptables might be blocking the internet access. To check:

1. On the Kali Linux desktop, run:
sudo iptables --list

Check for any rules that might be blocking the internet access.

2. If necessary, remove or modify the rules:
sudo iptables --delete INPUT --protocol tcp --dport 80 --source 192.168.42.0/24

Replace "80" with the desired port number.

This article covered troubleshooting mobile devices not having internet access when connected to a Kali Linux 2024.2 hotspot. We discussed common causes and their solutions, including wrong ESSID, wrong password, DHCP issues, and iptables. By following the steps above, you should be able to resolve the issue and enjoy a stable internet connection on your mobile device.