F1 Blog Space

Some helpful stuff thats going on
is collected here...

F1 Blog Space

We at F1-CONSULT work on really cool and amazing stuff
and discover and learn something new everyday.

F1 Blog Space

Here some of our 
Musings, Ramblings, Observations
to keep a record of our sometimes really hard learnings.

All 60
All 60 /AnyConnect 3 /Apple 1 /ASA 2 /BIND 1 /CISCO 1 /CISCO Security 0 /CUBE 5 /Debian 3 /github 1 /IOS-XE 1 /IPSEC 1 /IPv6 1 /LAN 2 /Linux 7 /Microsoft 0 /MySQL 1 /News 1 /Postfix 1 /QOS 1 /Security 10 /SEO 1 /SMTP 0 /SSD 1 /Storage 0 /Ubuntu 1 /VCSA 1 /VMWare 1 /VOICE 0 /WEB 0 /Windows Server 2 /WLAN 1 /WLC 2 /WordPress 1 /ZFS 4

CISCO – AnyConnect – The VPN connection to the secure gateway was interrupted and could not be automatically re-established

2023-11-15/by wriedel

CISCO – AnyConnect – Windows Autostart

2023-11-15/by wriedel

CISCO – AnyConnect – AnyConnect Profiles location

2022-03-22/by wriedel

Apple products on enterprise networks

Device setup



Apple devices need access to the following hosts…
2023-09-28/by wriedel

IPv6 – networking acronyms and abbreviations

2023-06-09/by wriedel

Cisco Transceiver Modules – Data Sheets

Transceiver-modules



Data Sheets



Optical transceiver modules















800G…
2023-02-01/by wriedel

ZFS – Replacing a dead disk in a zpool

ZFS – Single Path



[crayon-6812064decd63297954944/]



ZFS…
2018-02-13/by wriedel

LINUX – nmcli command examples (cheatsheet), compare nm-settings with if-cfg file

Table of Contents




Understanding nmcli
Compare nm-settings…
2021-06-07/by wriedel

WordPress – auto-update via proxy

Here a brief config snipped to allow Wordpress to

use a…
2018-02-07/by wriedel

Ubuntu – How to fix broken packages

1. fix broken packages
[crayon-6812064deddba694532168/]
2.…
2018-02-08/by wriedel

BIND – Response Policy Zones (RPZ)

ISC Webinars:
https://www.isc.org/mission/webinars

ISC Webinar…
2018-02-13/by wriedel

Debian – How to delete broken packages

1. remove broken packages
[crayon-6812064dee16a620947670/]
2.…
2018-02-08/by wriedel

MySQL – How to Back Up and Restore a Database

Declarations

Database: [dbname]
User: [uname]
Password:…
2018-02-14/by wriedel

CISCO ASA LDAP AAA Error ‘AAA Server has been removed’

Problem:
Attempting to test AAA authentication via LDAP to a…
2018-02-20/by wriedel

Postfix – DNSBL Providers

The complete IP check for sending Mailservers

DNSBL (DNS…
2018-02-23/by wriedel

CISCO CUBE SipGate

1. Cisco Unified Border Element with Support for Multi-VRF
Cisco…
2018-02-12/by wriedel

CISCO CUBE SIP TRACES

source: supportforums.cisco.com



Ayodeji Okanlawon










SIP…
2018-03-01/by wriedel

CISCO CUBE SIP DEBUGS

Source: supportforums.cisco.com
Muthurani…
2018-03-01/by wriedel

Clamav – Virus Protection

ClamAV: Description:
[crayon-6812064def9fd724816375/]
ClamAV:…
2018-04-09/by wriedel

Microsoft Windows Server 2016 – NFS Share

How To Mount An NFS Share In Windows Server 2016
Install NFS…
2018-03-05/by wriedel

CISCO – WLC – AP Not Joining Controller – %DTLS-3-HANDSHAKE_FAILURE

Cisco WLC AP cert issue: %DTLS-3-HANDSHAKE_FAILURE
WLC error…
2018-04-02/by wriedel

CISCO – WLC – Trouble Shooting Commands

Common outputs from the WLC for further analysis
[crayon-68…
2018-04-04/by wriedel

CISCO – WLAN – Factory Reset

How to restore the factory settings on a Cisco Access Point
1.…
2018-04-03/by wriedel

IPSec Overhead

What is IPSec?
IPSec, is a framework of open standards (from…
2018-04-09/by wriedel

DSGVO

Datenschutz-Grundverordnung DSGVO 2018
Kompakt und aktuell:
Die…
2018-05-18/by wriedel

Cybersecurity Conferences

2018-05-26/by wriedel

Network Operating Systems

Network Operating Systems




This page is an attempt…
2018-06-19/by wriedel

CISCO IOS and IOS-XE Call Routing

In Depth Explanation of Cisco IOS and IOS-XE Call Routing








Source: https://www.cisco.com











Updated:June…
2018-06-04/by wriedel

Solid State Drives Technology Comparison – SLC, MLC, TLC NAND

SSDs (Solid State Drives) use NAND flash chips. Each of these…
2018-06-01/by wriedel

CISCO CUBE SIP DEBUGS

How to capture SIP traffic on a router










monitor…
2018-07-12/by wriedel

How to Disable or Enable Disk Write Caching in Linux

ATA-Based Disks

Check out whether disk caching is enabled…
2018-07-10/by wriedel

GDPR

GDPR
GDPR effects any company that handles personal data of…
2018-06-06/by wriedel

How to Delete All VSS Shadows and Orphaned Shadows

2018-06-25/by wriedel

Tools to check website keyword ranking

AntRanks - Keyword Rank Tracking in Search Engines
Authority…
2018-05-30/by wriedel

Git – use a proxy

Configure Git to use a proxy
##In Brief

You may need to configure…
2018-08-13/by wriedel

Debian – How to disable snmpd ia_addr insert messages?

You have Debian and Ubuntu servers which runs snmpd service and are…
2018-07-14/by wriedel

ZFS – SNMP

ZFS - SNMP Extend Commands:
[crayon-6812064e01bbf543110256/…
2018-09-12/by wriedel

Debian – How do you select the fastest mirror from the command line?

I want to update my sources.list file with the fastest server…
2018-08-31/by wriedel

ZFS – Tuning

ZFS tuning for SAS3 Storage Tank
[crayon-6812064e0275b830949184/]
ZFS…
2018-09-13/by wriedel

Linux – Permissions

 



In order to update and change file permissions,…
2018-07-27/by wriedel

Linux – iproute2 Cheat Sheet

Overview



iproute2 is the Linux networking toolkit that…
2018-07-30/by wriedel

CentOS – NIC Teaming with LACP

A Comparison of Features in Bonding and Team




Feature
Bonding
Team




broadcast…
2018-09-10/by wriedel

ZFS – CENTOS Downgrade

ZFS - Downgrade Commands for Centos:
To do the downgrade/re-install…
2018-09-14/by wriedel

CentOS – How do I safely delete old kernel versions ?

package-cleanup:
Using package-cleanup command which is a…
2018-09-14/by wriedel

LINUX – Network Throughput Tuning

General Approach
To check what setting your system is using,…
2018-09-14/by wriedel

vCenter Server Appliance 6.5 fails to boot

2019-04-26/by wriedel

Risk Management Frameworks

Risk Management Frameworks
Risk Assessment should be considered…
2018-10-01/by wriedel

Threat Modeling

Application Threat Modeling
Application Threat modeling should…
2018-10-01/by wriedel

How to force fsck at every boot in Linux

In /etc/init.d/checkfs.sh is the line if [ -f /forcefsck…
2019-01-05/by wriedel

Common Vulnerabilities and Exposures – CVEnew

https://twitter.com/CVEnew
2019-01-14/by wriedel

Top 10 Best Proxy Server and online Proxy

proxysite.com proxy.orgFilterbypass.meUnblocker.usprox…
2019-01-02/by wriedel

Common Vulnerabilities and Exposures – CVEannounce

https://twitter.com/CVEannounce
2019-01-14/by wriedel

RFC 4594-Based 12-Class QoS Model

2020-05-07/by wriedel

CISCO IOS XE – passwords will soon be deprecated

2020-12-25/by wriedel

CISCO ASA – %ASA-6-722036 Transmitting large packet 1418 (threshold 1347)

2021-02-05/by wriedel

CentOS – Installer just goes black screen on Centos8

Problem:
During installation of CentOS the installer screen goes…
2020-06-25/by wriedel

The CyberWire

https://twitter.com/CVEnew
2020-04-18/by wriedel