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I want to setup a domain with two different DNS providers - Route53 and Azure. When testing the domain with ZoneMaster I get the following warning: The smallest possible legal referral packet is larger than 512 octets (it is 536) Here is the link to the test: https://zonemaster.net/test/44c3627a5ec7e269

Is this important? If so, how should I fix that?

Thanks

Community
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Or Yagel
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1 Answers1

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It is due to the fact that you have 8 nameservers which do not compress themselves very well because they are in different domains and have both A and AAAA records (which is very good in fact) so the packet is larger than 512 bytes.

While it should not be a problem anymore today, you may hit old hardware/software that will have trouble with DNS packets larger than 512 bytes. You can have a look at this other question which gives useful answers too: Why DNS through UDP has a 512 bytes limit?

If you can, try to update your domain to use one or two less nameservers.

Patrick Mevzek
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