Linux Network Security Optimization Advice

I need an experienced security specialist to tighten the defenses of an all-Linux environment, with the immediate focus on a comprehensive vulnerability assessment. The objective is to pinpoint weak spots across servers and network segments, then receive clear, actionable steps I can implement right away.

First, we’ll jump on a brief call so I can lay out the current topology, firewall rules, and service stack. After that, I want hands-on guidance running industry-standard scanners—Nmap, OpenVAS, or Nessus are all fine—and help interpreting every critical or high-risk finding. Your advice should translate directly into hardening measures: patch ordering, configuration tweaks, and policy changes that improve overall network resilience.

Deliverables
• Detailed vulnerability assessment report (including CVSS ratings, risk narrative, and remediation roadmap)
• Ready-to-apply firewall and SSH configuration snippets (iptables/ufw and sshd_config)
• 30-minute debrief call to walk through findings and next steps

Everything must align with modern LTS releases of Ubuntu and CentOS. I’ll provide SSH access to a test VM plus sanitized configs. If you have a proven track record securing Linux infrastructures and can start right away, I look forward to working together.