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changewait1's avatar
changewait1
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Jun 28, 2023

Questions about performance degradation when used with DNS features in GTM solutions

안녕 BIND를 사용하여 DNS 기능이 있는 내 F5 GTM 솔루션에서 GSLB 기능을 사용하려고 합니다. 성능이 저하된다는 말을 들었기 때문에 이에 대한 문서를 찾고 있습니다. 그러나 문서를 찾는 데 어려움을 겪고 있어 귀하의 도움을 요청하고 싶습니다. 감사합니다.
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boneyard's avatar
boneyard
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Thanks for the translate whisperer 

It might be worth to talk with a local F5 partner / reseller, probably easier with language and such.

In general dedicated F5 appliances / software doesn't behave worse and often better then general solutions. So not sure where the idea about sloweness comes from.

You can stop looking for GTM, the module is simply called DNS now. If yours is still called GTM you might be running quite old versions, which TMOS version is it?

whisperer's avatar
whisperer
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Jun 28, 2023

boneyardYou are incorrect sir. F5's own documentation confirms that I have said: https://my.f5.com/manage/s/article/K000132353. Every single Channel Engineer over the past 15 years I have been working with GTM and DNS also confirms. Additionally, I actually helped write the exam questions for the 302 exam.

  1. Performance

DNS Express loads the whole zone files into BIGIP memory, and leverages BigIP TMOS capacity to handle client queries. Its performance is far better than a BIND server, especially for TCP-based DNS requests.

I would NOT recommend running DNS only from BIND directly on the F5 DNS (formerly GTM) product. Plain and simple. It is also a disaster to maintain zones.. zonerunner? I would instead recommend BIND (if you dont care about IPAM and your amount of data is minimal) with Zone Trasnfer internally to localhost and DNS Express OR use a better IPAM equipped system like Infoblox and zone trasnfer to DNS Express. If using DNS Express on F5 DNS or even WIPs, then the performance will trump any competitor any day of the week (that I do agree with). However, straight from BIND on F5 DNS... NO!

  • boneyard's avatar
    boneyard
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    Jun 28, 2023

    very fair, i was not really considering the option of doing it in bind "natively" when you have the DNS module with all its goodness.

    the original questioner does mention bind yes, but i wonder how much gets lost in translation.

    • changewait1's avatar
      changewait1
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      Jun 29, 2023

      Hi team.

      I apologize for the late response.

      I tried to ask a question using the translator and accidentally posted the original text.

      Here's the situation I'm in and the questions I have.

      Situation : A customer is using Window DNS, and in this configuration, an F5 device has been introduced for GSLB purposes.

      However, the performance of Window DNS is not good, so I am checking if it is possible to use the DNS function on the F5 device introduced for GSLB.

      Q: I have heard that the performance of the F5 GTM solution degrades when used for DNS functions other than GSLB (I heard from someone that the performance degrades a lot when using BIND).

      So, I've been looking for official F5 documentation to see if that's true, but I'm not finding it, so I'm asking.

      Thanks.

      • boneyard's avatar
        boneyard
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        Jul 09, 2023

        Can you explain more what you mean with "possible to use the DNS function on the F5 device"?

        Do you want to manage your DNS records and DNS zones on the F5 device? Or do you want the F5 device to only answer DNS queries and keep doing your management on the Windows DNS?

        Also when you say the performance of the Windows DNS is not good, what do you mean exactly? Reponse times?