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BIG-IP did not truncate DNS responses (for non-EDNS0 queries) to 512 bytes. On TCP a query w/ or w/o EDNS0 may also be truncated.
The message may be too large over UDP; or it may be truncated over TCP.
A query with or without EDNS0 against DNS-Express or DNS Cache. On UDP, the query should be truncated to 512b if no EDNS0 is sent; of course if an EDNS0 max udp size is set, then truncate to that value. On TCP a response should never be truncated.
An iRule may be written to keep track of query ID and conditionally truncate the response.
BIGIP no longer truncates DNS over TCP; nor does it send more than 512 bytes over UDP when edns0 is not present.
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