Kerry CorderoKISS IT Design Principle - Human Error Prevention
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Troubleshooting

Routing & SwitchingSecurity

Palo Alto – Display Port Information (media type, interface counter, speed/duplex, etc…)

There are two good commands to run:...
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Laptops & DesktopsRouting & SwitchingVOIP

iperf and QOS/TOS Settings

iPerf is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various...
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Code

Common HTTP Response Codes

Laptops & DesktopsServers

Data Flow – DNS Resolution with AD and F5 BIG-IP DNS

1. Local Cache Check: You attempt to access a website (say, `app.lb.cordero.me`) on your Windows AD-managed laptop. Your operating system...
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Routing & SwitchingSecurity

Palo Alto – Incomplete , Not-Applicable, Unknown-tcp/udp , Insufficient Data , tcp-rst-from-client , tcp-rst-from-server

Incomplete = The three-way TCP handshake didn’t complete. (Routing issue or destination server not listening on the port) Not-applicable =...
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Laptops & DesktopsServers

Windows Display Protocol and Ethernet Statistics

There are 4 commands that are useful: netstat -s netstat -e netsh interface ipv4 show ipstats netsh interface ipv4 show...
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Security

Palo Alto – Perform FIB Lookup for a Specific Destination

This command is a good one that I use often. There are time I want to see if a route...
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Data CenterRouting & Switching

Cisco – Troubleshooting with Show Tech-Support and Tac-Pac on NX-OS

Cisco NX-OS, the network operating system running on Nexus series switches, offers powerful troubleshooting tools to network administrators. Among these...
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Routing & Switching

Python – Use RIPE to Research IP Subnet (BGP AS, Geolocation, Reverse DNS, CIDR Block, & Registration)

# Author: Kerry Cordero # Version: 1.0.0 # Description: This script will use RIPE to Research IP Subnet (BGP AS,...
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Routing & Switching

Total Output Drops on Cisco 3750x Switches

I came across a bug in IOS 12.2(53r)SE2 and it shows up in other IOS versions, where the “Total output...
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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
  • IP Calculator
  • 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 Azure 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 Splunk SSL Structured Cabling TLS Troubleshooting Upgrade VMWare Zscaler
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