Bug ID 1082197: RNAME and MNAME field order reversed for Synthetic SOAs sent for negative response

Last Modified: Sep 29, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP DNS(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3,,

Opened: Feb 18, 2022
Severity: 3-Major


Synthetic SOA returned by BIG-IP has the MNAME and RNAME fields reversed, resulting in the wrong values being noted as the primary name server and mailbox of administrator, respectively.


Per RFC (rfc1035) the order of the fields is significant and MNAME must come before RNAME. When reversed, consumers of the synthetic SOA will associate the wrong values with the wrong fields.


-- Set the failure-rcode-response enabled and failure-rcode-ttl on a down WIP. -- Perform a DNS query. -- Observe the SOA.



Fix Information


Behavior Change