Kerry CorderoPractical Network Engineering Notes
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Kerry Cordero
JoinedMay 2, 2023
Articles698
20+ years of experience and proven performance in large scale enterprise network infrastructure architecture, design, implementation, migration, security, operation, troubleshooting, leading/managing teams, and budgets. I have a BS in Cybersecurity and a Master's from the University of Florida.
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Laptops & DesktopsServers

DNS, SFTP, and FTPS: Why Firewalls Handle These Protocols Differently

1. DNS Resolution and Protocol Handling Both HTTPS and SFTP require DNS resolution if a domain name (FQDN) is used:...
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Laptops & Desktops

Troubleshooting FTP Passive Mode Failures with Packet Capture Analysis

While troubleshooting an FTP transfer failure, we observed that a client could successfully transfer files to the DEVFTP server but...
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Code

Python – Two Scripts to Get MAC Addresses, Lookup ARP to Get IP and Do an DNS Reverse Lookup

There are two scripts below. This is if you’re in an environment where you MAC Addresses and ARP table are...
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Protected: kc-ts-v1

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Load Balancing

F5 GSLB Best Practices: How to Manually Fail Over a Wide IP to Another Datacenter

Below is a concise explanation of how to manually fail over a Wide IP (for DNS load balancing) to another...
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Code

Protected: Python – Use an Existing Spreadsheet to get the IP and DNS Names

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Active Directory (AD) AWS Best Practices BGP Certificates Cisco Cisco ACI Cisco ASA Cisco ASR Cisco Catalyst Cisco CLI Cisco ISE Cisco Nexus Cisco Stack DDOS Design DNS EIGRP F5 HTTP(S) IP Addressing and Subnetting Microsoft IIS Microsoft SQL Microsoft Windows Netflow OSPF Packet Capture Palo Alto Palo Alto CLI PDF Planning Ports PowerShell python QOS snmp Spanning-Tree Splunk SSL Structured Cabling TLS Troubleshooting Upgrade VMWare Zscaler
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  • Home
  • About
  • Disclaimer
  • Guides and Slides
    • AWS Well-Architected Framework
    • Facebook – Running BGP in the Data Center at Scale
    • Microsoft – Experiences with BGP in Large Scale Data Centers
    • Palo Alto PCNSE Study Guide
  • Tools
    • Car Calculator
    • RouteAgg
    • IP Calculator
    • VSLM
  • Links
  • Contact

Categories

  • AI
  • Business Management
  • Cloud
  • Code
  • Data Center
  • Laptops & Desktops
  • Load Balancing
  • Routing & Switching
  • Security
  • Servers
  • Uncategorized
  • VOIP
  • Wireless

Tags

Active Directory (AD) AWS Best Practices BGP Certificates Cisco Cisco ACI Cisco ASA Cisco ASR Cisco Catalyst Cisco CLI Cisco ISE Cisco Nexus Cisco Stack DDOS Design DNS EIGRP F5 HTTP(S) IP Addressing and Subnetting Microsoft IIS Microsoft SQL Microsoft Windows Netflow OSPF Packet Capture Palo Alto Palo Alto CLI PDF Planning Ports PowerShell python QOS snmp Spanning-Tree Splunk SSL Structured Cabling TLS Troubleshooting Upgrade VMWare Zscaler
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