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my version: BIND 9.11.4

local Cache ttl is 8, but dig value far beyond ttl

I have Captured, you can check the lines 50&51 104&106 of the followongh file

dns_ttl.pcap

53.1.42.13 tell 53.1.82.19 cluster01.myobs.com ttl 5

but 53.1.82.19 tell 53.1.42.16 cluster01.myobs.com ttl 1585212656

and use "dig cluster001.myobs.com" query also return 15821216xx

and use "rndc dumpdb" generate cache_dump.db, can not find "cluster001.myobs.com"

I can't understand how such a big ttl came