BIND changes the way it handles URI resource records, impacting also URI backward compatibility
With this update, the BIND suite no longer adds an additional length byte to a value field when using a URI resource record. This also means that BIND in Red Hat Enterprise Linux (RHEL) 7.4 communicates only in the format described in RFC 7553: https://tools.ietf.org/html/rfc7553.
Note that this update makes new URI records incompatible with records created using BIND in previous versions of RHEL. Namely, BIND in RHEL 7.4 cannot:
* Understand URI records provided by previous versions of BIND in RHEL.
* Serve URI records to clients using previous versions of BIND in RHEL.
However, BIND in RHEL 7.4 still can:
* Cache and receive records from both earlier and future versions of BIND in RHEL.
* Serve records in the old URI format encoded as Unknown DNS Resource Record. See RFC 3597 for details: https://tools.ietf.org/html/rfc3597.
After this update, you do not need to make any change to the DNS zone files.