#Network Security on Linux

[bestarhost]

How to Allow IP Addresses through Firewall Linux?

Configuring IP Access with iptables

Verifying iptables Installation

Listing Current Firewall Rules

Allowing Specific IP Addresses

Saving iptables Rules

Creating a Secure IP Whitelist

Defining Your IP Whitelist

Configuring iptables Rules

Testing Connectivity

Streamlining Firewall Management with BeStarHost

Introducing BeStarHost

Using BeStarHost for IP Whitelisting

Best Practices for Linux Firewall Management

Regularly Review and Update Whitelist

Implement Fail2Ban for Additional Security

Conclusion:

Effectively managing your Linux firewall is an integral part of maintaining a secure server environment. By mastering iptables and understanding how to allow specific IP addresses, you fortify your defenses against potential threats. Whether you opt for manual configuration or utilize tools like BeStarHost, the key is to stay vigilant, update your rules regularly, and adapt your security measures to evolving threats. Implementing these practices will empower you to keep your Linux server secure and resilient.

To Learn More, Click this Link:

[sentientcitysurvival]

Basic Linux Security

Install Unattended Upgrades and enable the "unattended-upgrades" service.

Install ClamAV and enable "clamav-freshclam" service.

Install and run Lynis to audit your OS.

Use the "last -20" command to see the last 20 users that have been on the system.

Install UFW and enable the service.

Check your repo sources (eg; /etc/apt/).

Check the /etc/passwd and /etc/shadow lists for any unusual accounts.

User the finger command to check on activity summaries.

Check /var/logs for unusual activity.

Use "ps -aux | grep TERM" or "ps -ef | grep TERM" to check for suspicious ongoing processes.

Check for failed sudo attempts with "grep "NOT in sudoers" /var/log/auth.log.

Check journalctl for system messages.

Check to make sure rsyslog is running with "sudo systemctl status rsyslog" (or "sudo service rsyslog status") and if it's not enable with "sudo systemctl enable rsyslog".

Perform an nmap scan on your machine/network.

User netstat to check for unusual network activity.

Use various security apps to test you machine and network.

Change your config files for various services (ssh, apache2, etc) to non-standard configurations.

Disabled guest accounts.

Double up on ssh security by requiring both keys and passwords.

Check your package manager for any install suspicious apps (keyloggers, cleaners, etc).

[t-chnically]

I created this with the intended purpose to document the jank stuff on my network and what goes on.

[meet-soni-blog]

Remote File Access - FTP

Lab Objective: Learn how to save configurations using File Transfer Protocol. 

Lab Purpose: Any data which is not backed up, you risk losing. On corporate networks, you should have a detailed backup and recovery plan. You may well use Secure FTP or some other secure method. In this lab, we will back up your router configuration using FTP (File Transfer Protocol).

Lab Tool: Cisco Packet Tracer

Lab Topology: 

Task 1: Connect a router to a server using a cross-over cable. 

Task 2:

Enter ‘no’ and press enter for the message. ‘Would you like to enter the initial configuration dialogue? [yes/no]:’

Configure an IP address on your Ethernet interface on your router. 

Task 3: Configure an IP address on your server's Ethernet interface. Set the default gateway address to the router. 

Task 4: Ping the router from the server.

Task 5: Router configurations are stored in NVRAM, but you need to save the live configuration there in order to populate it. Use the ‘copy run start’ command in the privileged mode of the router. Any values inside the [] are the default, so just press the enter key.

Task 6: Configure FTP credentials on the server. User the username ‘demo’ and password ‘pass’. Trick all the access level boxes and then ‘Add’.

Task 7: Add the FTP username and Password to the router using the global configuration mode. 

Task 8: Copy the router configuration to the FTP server. Rename the saved file to ‘router-meet’. If you had to copy it back, you would need to rename it to ‘Router-config’ but don’t worry about that for now.

Task 9: Check that file is on the FTP server. You will have to click on another service and back onto FTP because there is no refresh key. 

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