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Routing & Switching

Cisco Cable Test Command

Cisco has a command that can run TDR tests on an interface. A TDR (time-domain reflectometer) is an electronic instrument...
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Routing & Switching

Cisco Router Viewing Crash Files

Contents of the Crashinfo File The crashinfo file contains this information: *limited error message (log) and command history *description of...
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Routing & Switching

Cisco Fiber Troubleshooting with DOM

Cisco supports DOM (Digital Optical Monitoring) which is an industry standard to capture real time operating stastics such as:...
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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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Routing & SwitchingSecurity

Cisco IOS Packet Capture

On an IOS router (for example a 890, 1900, 2900. 3900, 7200 Series Router) there is a capability to capture...
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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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Security

Cisco ASA VPN Tunnel Encaps Decaps

If you look below, you can see going over a tunnel that the decaps are at 0 and the encaps...
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Laptops & DesktopsRouting & Switching

Cisco Jumbo MTU Notes

A jumbo frame is technically any Ethernet frame over 1500....
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Laptops & DesktopsSecurity

Windows 7/2008 and Newer built-in Packet Capture

To start the capture: netsh trace start capture=yes overwrite=no maxSize=500 tracefile=c:\Users\capture1.etl Trace configuration: ------------------------------------------------------------------- Status: Running Trace File: C:\Users\capture1.etl Append:...
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Security

Cisco ASA VPN Filters

ACL looks like this: access-list VPN-FILTER permit {remote-IP} [remote-Port] {local-IP} [local-Port] Examples: LOCAL:              ...
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Categories

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

Tags

AWS Azure Best Practices BGP Certificates CISA Cisco Cisco ACI Cisco ACS Cisco ASA Cisco ASR Cisco Catalyst Cisco CLI Cisco ISE Cisco Nexus Cisco Stack Cisco Wireless DDOS Design DNS EIGRP F5 HP IP Sla Kali Logging macOS Microsoft IIS Microsoft Windows Netflow Okta OSPF Packet Capture Palo Alto Palo Alto CLI PDF Ports PowerShell QOS snmp Splunk SSL Structured Cabling Troubleshooting VMWare
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Troubleshooting Palo Alto Microsoft Windows Cisco ASA PDF
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