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Blogs

F5 Blog

F5 GTM/DNS Load Balancing Modes

this will be the description of the different modes     Topology Load Balancing Mode Topology is a proximity based load balancing mode that allows you to direct traffic by defining topology records and selecting the Topology load-balancing mode for the wide IP or pool. The Topology mode bases the distribution of requests on the topology records and the weighted scores configured for each record. The topology records direct DNS queries to the closest virtual server, based on g
Rev Dens Blog

Helping Build a Fence

Our friends need help to build a privacy fence since they are getting crazy high quotes of tens of thousands of dollars to build a simple privacy fence. Here are the basics on how I attack building a privacy fence Getting Started Preparation mark out where your fence is going call miss dig to make sure you aren't going to hit any under ground wiring get a building permit from your city measure the total area (length of each leg) to help price out material Gather tools and material To dig a p
F5 Blog

No Statistics on BIG-IQ from BIG-IPs

After upgrade to 8.0 I am unable to get any stats which means Applications tab doesn't work and just kicks out an error and same thing for most everything under the Monitoring tab. What did I try? I removed the BIG-IP device and readded it with same results I removed DCD and readded it back in which took about an hour each because it would hang on ES_ service What worked? These steps will only affect the configuration between the Big-IQ and the DCDs, none of the B
F5 Blog

BIG-IQ import devices via CSV

If you are leveraging the BIG-IQ tool (version 7.x or newer) to import devices using a CSV there are a few things you should know. It would probably help to know the columns needed (note you do not include the column headers in the csv) So when you Save your CSV it MUST NOT be in UTF-8 mode or it will fail when you try and import it with incorrect Management IP Address which is the first column since the CSV import can not read a CSV saved in UTF-8 mode. Anyhow, your CSV sho
F5 Blog

Authentication Issues on F5

We upgraded to 15.1.2.1 and now we seem to have a bunch of issues authenticating using either AD or TACACS.  It requires multiple tries and then it eventually works. Our first attempt is to fix the F5 devices that are using AD only vi /etc/openldap/ldap.conf You have to add a new line Then you need to run tmsh list auth ldap system-auth referrals auth ldap system-auth {     referrals yes } If its yes, then change it to no by running tmsh modify auth ldap system-aut
EventGuyZ Blog

Davison Robotics

Davison Robotics is part of an extra curricular activity offered to students of the Davison Community Schools that offers the ability to learn STEM (Science, Technology, Engineering, and Mathematics) and is part of FIRST.   Current Davison Community School FIRST Teams include: Davison High School (Team 3534) Davison Middle School (Team 10058, Team 9514 ) Davison Intermediate School ( ) Davison Elementary School ( ) EventGuyZ became a supporter and address
Rev Dens Blog

When COVID is Over

When this coronavirus is over and life returns to what we call normal, may we never, ever take for granted again..... A handshake or a kind word from a stranger A hug from a friend Worshipping with other believers in a crowded church service A boring night at home Full shelves at the grocery store A Friday night out with the wife or husband at your favorite restaurant Looking for a parking space at your kid's ballgame Coffee with a long-time friend Kisses on the cheek by your grandchild
Sermons

A Done Deal

Col. 2:11-15 -------------------------------------------------------------------------------- And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses (Colossians 2:13 KJV)    You have negotiated a contract. All parties are happy with the terms. The check is written. You are given title. The deed is conveyed to your name. The deal is done. And the good news is that you are not in debt. You h
F5 Blog

F5 GTM-DNS Sync Group

This is to help better explain the purpose of a sync group on the F5 GTM's or otherwise known as BIG-IP DNS. The following figure shows that, after a configuration change is made on the Los Angeles BIG-IP DNS system, the local big3d process initiates an iQuery connection to BIG-IP DNS sync group members in New York and Europe and advertises the updated configuration to the remote gtmd processes. Synchronization details When you configure BIG-IP DNS synchronization, the sync
  • guru
F5 Blog

Splunk Request Logging

Assumptions: Log volume will be huge and will only turn for critical applications that too in production. This can be tested in Dev/Pre-prod prior moving to the production but need to be turned off immediately.This will not cause performance issues because of High-speed logging HSL feature. This logging feature can also be turned on for troubleshooting purposes if required. Dependencies: Enterprise splunk team should provision dedicated storage for the new applications with F
  • guru
Sermons

K8 Strong the Journey

This journey I try and capture as much as I can as my wife battles cancer in hopes to help someone else that might be fighting cancer as well will have an idea of what to face which include the good and the bad. I'm writing this from the ER waiting room at the McLaren hospital in Flint, Michigan but let me explain how we got here. My wife, Kate (aka K8), has been feeling sluggish (no energy) and she has been loosing lots of weight without even trying.  Lack of wanting to eat which are all signs
MAF

Credit Card Terminals (Clover)

Count Room receives all credit card terminals.  They will split up the terminals for what is assigned to Box Office and what is assigned to Count Room / Food Booths.  Once Box Office recieves the credit card terminals from Count Room, take a note of the last 4 numbers of the serial number of the credit card terminal and where it will be assigned for the run of the that season. Example:   CC SALES These terminals use CELL service so no need to worry if it's connected to
F5 Blog

Troubleshooting proxy and/or 3rd party URLs

This is extremely useful troubleshooting external URLs going through proxy / eGTMs / iGTMs and all other sort of combinations. What i really like about it is it really gives good data for different touch points. 1.time_namelookup 2.time_connect 3.time_appconnect 4.time_pretransfer 5.time_redirect 6.time_starttransfer It helped me handling extrenal 3rd party URLs and their response times, handshake failures. ********************************************************
  • guru
F5 Blog

Identify SSL Profile with Virtual Server

Sometimes you just need to know what SSL Profile is attached to what Virtual Servers. Here are a couple of cheats I use..  maybe it helps ya, maybe it don't Simple command to run that looks in every partition tmsh -q -c 'cd / ; show ltm virtual recursive profiles' | egrep 'Ltm::Virtual Server:| Ltm::ClientSSL Profile:' You can always tack on | grep virtualservername OR To find what virtual servers have a certain ssl profile, you can tack on | grep -B1 sslprofile name
Sermons

Chastity

"'Purity?' they ask. And they smile. They are the ones who go on to marriage with worn-out bodies and disillusioned souls." - St. Josemaria Escriva In this day and age, when someone hears about Chastity they may think of abstinence, modesty, and celibacy. Those who practice these things are guarding themselves from certain aspects of sexuality. They resist the over-sexualization that is happening in American culture and are sometimes looked down on because of it. Being Chaste does not
Sermons

Humility

"They are forever free who renounce all selfish desires and break away from the ego-cage of 'I', 'me', and 'mine' to be united with the Lord. This is the supreme state."-Bhagavad Gita Humility, or being humble, is being respectful, submissive, and modest. It is the opposite of pride and arrogance and is considered a virtue by most major religions and philosophical traditions. We are most often humiliated when we lack humility. The challenge is that our nature compels us to want to feel powe

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