Technical Tip: How to setup DNS TXT record with text length that has more than 255 characters

[Khidzir_MN]

Description	This article describes how to set up a DNS TXT record with a text length that has more than 255 characters. It is maybe necessary to preconfigure other respective DNS setups and refer to the documentation at the end of this article for more information on configuring DNS zone.
Scope	FortiADC.
Solution	FortiADC will prompt the below error if the TXT record text length has more than 255 characters. As an example, the TXT record for smtp._domainkey.example.com as below. V=DKIM1; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAraC3pqvqTkAfXhUn7Kn3JUNMwDkZ65ftwXH58anno/bElnTDAd/idk8kWpslrQIMsvVKAe+mvmBEnpXzJL+0LgTNVTQctUujyilWvcONRd/z37I34y6WUIbFn4ytkzkdoVmeTt32f5LxegfYP4P/w7QGN1mOcnE2Qd5SKIZv3Ia1p9d6uCaVGI8brE/7zM5c/zMthVPE2WZKA28+QomQDH7ludLGhXGxpc7kZZCoB5lQiP0o07Ful33fcED73BS9Bt1SNhnrs5v7oq1pIab0LEtHsFHAZmGJDjybPA7OWWaV3L814r/JfU2NK1eNu9xYJwA8YW7WosL45CSkyp4QeQIDAQAB The TXT record above needs to be separated with two quotes “ “ as below example before it can be use in the FortiADC TXT record. Note that there’s a space between the quotes. v=DKIM1; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAraC3pqvqTkAfXhUn7Kn3JUNMwDkZ65ftwXH58anno/bElnTDAd/idk8kWpslrQIMsvVKAe+mvmBEnpXzJL+0LgTNVTQctUujyilWvcONRd/z37I34y6WUIbFn4ytkzkdoVmeTt32f5LxegfYP4P/" "w7QGN1mOcnE2Qd5SKIZv3Ia1p9d6uCaVGI8brE/7zM5c/zMthVPE2WZKA28+QomQDH7ludLGhXGxpc7kZZCoB5lQiP0o07Ful33fcED73BS9Bt1SNhnrs5v7oq1pIab0LEtHsFHAZmGJDjybPA7OWWaV3L814r/JfU2NK1eNu9xYJwA8YW7WosL45CSkyp4QeQIDAQAB From GUI: 1) Go to the Global Load Balance -> Zone Tools -> Zone (tab) -> <respective zone> to add the record. 2) Under the Zone Records, select Create New and select TXT Record. In the Name option, input smtp._domainkey (example). In the Text option, input the separated TXT record value. 3) Select Save. From CLI: Note that in CLI, additional backslash \ needed before each quotes \" \" # config global-dns-server zone         edit "fqdn_generate_example.com."         set type fqdn-generate         set domain-name example.com.         config txt-record             edit 1                 set name smtp._domainkey                 set text "v=DKIM1; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAraC3pqvqTkAfXhUn7Kn3JUNMwDkZ65ftwXH58anno/bElnTDAd/idk8kWpslrQIMsvVKAe+mvmBEnpXzJL+0LgTNVTQctUujyilWvcONRd/z37I34y6WUIbFn4ytkzkdoVmeTt32f5LxegfYP4P/\" \"w7QGN1mOcnE2Qd5SKIZv3Ia1p9d6uCaVGI8brE/7zM5c/zMthVPE2WZKA28+QomQDH7ludLGhXGxpc7kZZCoB5lQiP0o07Ful33fcED73BS9Bt1SNhnrs5v7oq1pIab0LEtHsFHAZmGJDjybPA7OWWaV3L814r/JfU2NK1eNu9xYJwA8YW7WosL45CSkyp4QeQIDAQAB"                 next            end     end Refer to the below documentation for more information on configuring DNS zone: https://docs.fortinet.com/document/fortiadc/7.2.0/handbook/436760/configuring-dns-zones