Port Scanning Countermeasures (2024)

Table of Contents
Mohammed Salehuzzaman Configure firewall and IDS rules to detect and block probes. More articles by this author Introduction to Enumeration (Part:01) Introduction to Network Scanning and Tools (part:03) Introduction to Network Scanning and Tools (part:02) Introduction to Network Scanning and Tools (part:01) DNS Footprinting & Countermeasures Website Footprinting Information Obtained in Footprinting

Port Scanning Countermeasures (1)

Mohammed Salehuzzaman Port Scanning Countermeasures (2)

Mohammed Salehuzzaman

Cloud Engineer | Cloud Security Architect | Cyber Security Analyst

Published Jan 12, 2024

Configure firewall and IDS rules to detect and block probes.

  • Run the port scanning tools against hosts on the network to determine whether the firewall properly detects the port scanning activity.
  • Ensure that mechanisms used for routing and filtering at the routers and firewalls respectively cannot be bypassed using particular source ports or source-routing methods.
  • Ensure that the router, IDS, and firewall firmware are updated to their latest releases.
  • Use a custom rule set to lock down the network and block unwanted ports at the firewall.
  • Filter all ICMP messages (i.e. inbound ICMP message types and outbound ICMP type 3 unreachable messages) at the firewalls and routers.
  • Perform TCP and UDP scanning along with ICMP probes against your organization's IP address space to check the network configuration and its available ports.
  • Ensure that the anti-scanning and anti-spoofing rules are configured.

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Port Scanning Countermeasures (2024)
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