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

Last Modified: Dec 20, 2023

Affected Product(s):
BIG-IP DNS(all modules)

Known Affected Versions:
13.1.5,,,, 14.1.5,,,,,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10,,, 16.1.2,,, 16.1.3,,,,,, 16.1.4,,

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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips