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Lightboard Lessons: F5 BIG-IP DNS (GTM) iQuery Protocol Overview

In this episode of Lightboard Lessons, I introduce iQuery, the F5 proprietary protocol utilized by BIG-IP DNS to exchange system configuration with other BIG-IP DNS systems and performance metrics wi...
Published Aug 09, 2017
Version 1.0
application delivery
BIG-IP DNS
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JRahm's avatar
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Christ Follower, Husband, Father, Technologist. I love community and I especially love THIS community. My background is networking, but I've dabbled in all the F5 iStuff, I'm a recovering Perl guy, and am very much a python enthusiast. Learning alongside all of you in this accelerating industry toward modern apps and architectures.
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JRahm's avatar
Icon for Admin rankAdmin
Christ Follower, Husband, Father, Technologist. I love community and I especially love THIS community. My background is networking, but I've dabbled in all the F5 iStuff, I'm a recovering Perl guy, and am very much a python enthusiast. Learning alongside all of you in this accelerating industry toward modern apps and architectures.
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Chause1's avatar
Chause1
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May 29, 2020

  hope you are well?

 

I have two question regarding a full mesh between DNS (GTM) and LTM's

 

Question 1

 

Here is my example:

 

3 DC's (Call them DC1/2/3)

Each DC contains 1 GTM and 2 LTM's

 

When a netstat command is executed how many tcp 4353 (iquery) connections should be seen on say DC 1?

 

I would say that it will be 9 as there is a connection to all GTM's and LTM's in each DC and then a connection to the GTM itself in the DC1

 

 

Question 2

 

Config sync between GTM's

 

Again 3 DC's same as above

netstat shows that DC 3 iquery is incomplete

 

DC1 -> DC2 OK

DC1 -> DC3 FAILED

DC2 -> DC1 OK

DC2 -> DC3 FAILED

DC3 -> DC1 OK

DC3 -> DC2 OK

 

Chnages made on DC 3 will not sync to any of the other GTM's is this correct?

 

Thanks