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Troubleshooting

Routing & SwitchingServers

MTU 1500: Fragmentation after 1472 bytes “Packet needs to be fragmented but DF set”

Data Network = default MTU=1500 OS/VMware/Etc.. = default MTU=1500 When you try to ping with an MTU of 1500, you...
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Laptops & DesktopsRouting & SwitchingServers

Test Jumbo Frames and MTUs with Ping

Use the command below to test jumbo frames: Windows: ping {ip_address} -f -l 8972 -l 8972 value is actually equal...
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Security

Palo Alto Test Policy Matches

Test a security policy rule: test security-policy-match application twitter-posting source-user cordero\kcordero destination 98.2.144.22 destination-port 80 source 10.200.11.23 protocol 6...
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Security

Palo Alto – SSL Decrypt Test Which Policy is Used CLI

Used the “test decryption-policy-match” command: corderoPA-A(active)> test decryption-policy-match source {SOURCE-IP} destination {DESTINATION-IP} Matched rule: 'Do Not Decrypt' action: no-decrypt...
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Data CenterRouting & Switching

Cisco ACI Troubleshooting

Laptops & DesktopsServers

Using CURL to get HTTP/S Status Codes

~ curl -Is https://{SITE}.com | head -1 HTTP/2 200 ➜ ~ curl -Is https://{SITE}.com/login.asp | head -1 HTTP/2 404 ➜...
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Security

Palo Alto Test a Sample Malware File

Step 1: Download one of the malware test files. You can select from PE, APK, MacOSX, and ELF. If you...
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Security

Palo Alto URL Filtering Test Pages

Keep in mind, this information will be logged as well, so you can query your logs. Here is a list...
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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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Data CenterRouting & Switching

OSPF LSA Type Overview

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Copyright © 2022 Kerry Cordero
  • Home
  • About
  • Disclaimer
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Categories

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

Tags

Akamai 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 HP IP Sla Kali macOS MFA Microsoft IIS Microsoft Windows Netflow NMAP NTP Okta OSPF Packet Capture Palo Alto Palo Alto CLI Ports powershell QOS snmp Splunk SSL Troubleshooting Upgrade Verified VMWare
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Troubleshooting Palo Alto Verified Microsoft Windows Cisco ASA
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