and our domain has not (yet) DS record.
and then does NOT honor my policy for it's subdomains.
Nov  3 08:26:24 ud kresd[1293]: [17479][cach]   => no NSEC* cached for zone: company.cz. Nov  3 08:26:24 ud kresd[1293]: [17479][cach]   => skipping zone: company.cz., NSEC, hash 0;new TTL -123456789, ret -2 Nov  3 08:26:24 ud kresd[1293]: [17479][cach]   => skipping zone: company.cz., NSEC, hash 0;new TTL -123456789, ret -2 Nov  3 08:26:24 ud kresd[1293]: [17479][plan]   plan '.' type 'DNSKEY'
Nov  3 08:26:24 ud kresd[1293]: [46470][iter]     '.' type 'DNSKEY' id was assigned, parent id 17479
Nov  3 08:26:24 ud kresd[1293]: [46470][cach]     => satisfied by exact RRset: rank 060, new TTL 125366
Nov  3 08:26:24 ud kresd[1293]: [46470][iter]     <= answer received:
Nov  3 08:26:24 ud kresd[1293]: ;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 46470
Nov  3 08:26:24 ud kresd[1293]: ;; Flags: qr aa  QUERY: 1; ANSWER: 0; AUTHORITY: 0; ADDITIONAL: 0
Nov  3 08:26:24 ud kresd[1293]: ;; QUESTION SECTION
Nov  3 08:26:24 ud kresd[1293]: .#011#011DNSKEY
Nov  3 08:26:24 ud kresd[1293]: ;; ANSWER SECTION
Nov  3 08:26:24 ud kresd[1293]: .                   #011125366#011DNSKEY#011256 3 8 AwEAAdp440E6Mz7c+Vl4sPd0lTv2Qnc85dTW64j0RDD7sS/zwxWDJ3QRES2VKDO0OXLMqVJSs2YCCSDKuZXpDPuf++YfAu0j7lzYYdWTGwyNZhEaXtMQJIKYB96pW6cRkiG2Dn8S2vvo/PxW9PKQsyLbtd8PcwWglHgReBVp7kEv/Dd+3b3YMukt4jnWgDUddAySg558Zld+c9eGWkgWoOiuhg4rQRkFstMX1pRyOSHcZuH38o1WcsT4y3eT0U/SR6TOSLIB/8Ftirux/h297oS7tCcwSPt0wwry5OFNTlfMo8v7WGurogfk8hPipf7TTKHIi20LWen5RCsvYsQBkYGpF78=
Nov  3 08:26:24 ud kresd[1293]: .                   #011125366#011DNSKEY#011257 3 8 AwEAAagAIKlVZrpC6Ia7gEzahOR+9W29euxhJhVVLOyQbSEW0O8gcCjFFVQUTf6v58fLjwBd0YI0EzrAcQqBGCzh/RStIoO8g0NfnfL2MTJRkxoXbfDaUeVPQuYEhg37NZWAJQ9VnMVDxP/VHL496M/QZxkjf5/Efucp2gaDX6RS6CXpoY68LsvPVjR0ZSwzz1apAzvN9dlzEheX7ICJBBtuA6G3LQpzW5hOA2hzCTMjJPJ8LbqF6dsV6DoBQzgul0sGIcGOYl7OyQdXfZ57relSQageu+ipAdTTJ25AsRTAoub8ONGcLmqrAmRLKBP1dfwhYB4N7knNnulqQxA+Uk1ihz0=
Nov  3 08:26:24 ud kresd[1293]: .                   #011125366#011DNSKEY#011257 3 8 AwEAAaz/tAm8yTn4Mfeh5eyI96WSVexTBAvkMgJzkKTOiW1vkIbzxeF3+/4RgWOq7HrxRixHlFlExOLAJr5emLvN7SWXgnLh4+B5xQlNVz8Og8kvArMtNROxVQuCaSnIDdD5LKyWbRd2n9WGe2R8PzgCmr3EgVLrjyBxWezF0jLHwVN8efS3rCj/EWgvIWgb9tarpVUDK/b58Da+sqqls3eNbuv7pr+eoZG+SrDK6nWeL3c6H5Apxz7LjVc1uTIdsIXxuOLYA4/ilBmSVIzuDWfdRUfhHdY6+cn8HFRm+2hM8AnXGXws9555KrUB5qihylGa8subX2Nn6UwNR1AkUTV74bU=
Nov  3 08:26:24 ud kresd[1293]: .                   #011172800#011RRSIG#011DNSKEY 8 0 172800 20181121000000 20181031000000 20326 . V2mFe8AVsbdN0t7lZQz9uxIN0PUmb5xR9e70Hm07sgPkqerHKdBqXZjTTfwnixLkyiCP43zTJhBZH8OQbTy9aCI6P0FxjPV4qPdEdb4L+3c8bybYMdFtUgI3JFmJcTVtaibgtCZjLjZIXsbdbwOS2Ukm0Py2zHA6TGDVxG1M7BerTPLYCGNMuEhL8dvMegWZDbVcCfxrLTIl/smTTMfMz88/2QMMlIILENFn2HGxn6n9KGFGSM9fnvIuoSltt+BFYaxKdxjF02vM4/Ea6ZJ4PZhU1wGmedxoqoJYKgJYnrMmvhZEUyAhTP3w/ikPhmucA3OZkMJbxOvephxZSuMtQw==
Nov  3 08:26:24 ud kresd[1293]: [46470][iter]     <= rcode: NOERROR
Nov  3 08:26:24 ud kresd[1293]: [46470][vldr]     <= parent: updating DNSKEY
Nov  3 08:26:24 ud kresd[1293]: [46470][vldr]     <= answer valid, OK
Nov  3 08:26:24 ud kresd[1293]: [58698][plan]   plan 'cz.' type 'DS'
Nov  3 08:26:24 ud kresd[1293]: [49896][iter]     'cz.' type 'DS' id was assigned, parent id 58698
Nov  3 08:26:24 ud kresd[1293]: [49896][cach]     => satisfied by exact RRset: rank 060, new TTL 24337
Nov  3 08:26:24 ud kresd[1293]: [49896][iter]     <= answer received:
Nov  3 08:26:24 ud kresd[1293]: ;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 49896
Nov  3 08:26:24 ud kresd[1293]: ;; Flags: qr aa  QUERY: 1; ANSWER: 0; AUTHORITY: 0; ADDITIONAL: 0
Nov  3 08:26:24 ud kresd[1293]: ;; QUESTION SECTION
Nov  3 08:26:24 ud kresd[1293]: cz.#011#011DS
Nov  3 08:26:24 ud kresd[1293]: ;; ANSWER SECTION
Nov  3 08:26:24 ud kresd[1293]: cz.                 #01124337#011DS#01120237 13 2 CFF0F3ECDBC529C1F0031BA1840BFB835853B9209ED1E508FFF48451D7B778E2
Nov  3 08:26:24 ud kresd[1293]: cz.                 #01186400#011RRSIG#011DS 8 1 86400 20181115050000 20181102040000 2134 . y34iT/kNbVTU3joieB2yxbOGxHhv4xt6YrfdnfKEMfQLgyrxyvbHNRUQ3eeYheLh/jzbAqmWhynL28FcGbCe31GQV+gRLMRObMrhxTDvLMYgpekWl37f0JmVXhsFLlhsz4j0ylkeukrIjOtXP5o/tHeSdQpb9nM+ceOV9+Ziqmq8PTP1diXOwravepD3sKuER+GzFEQkreL+g/UCLuH6O+5mswRZUUsu2KInY9eaE4V49J5kFtnox92yR7sxYeadzPv9a/6HyME82nz5s5z8aUjajlNHV26eEJlfl8JQB6q1f/x0Kpqwofur/dioFKxtmF/QNum+pn9P7RAu0XxGSA==
Nov  3 08:26:24 ud kresd[1293]: [49896][iter]     <= rcode: NOERROR
Nov  3 08:26:24 ud kresd[1293]: [49896][vldr]     <= DS: OK
Nov  3 08:26:24 ud kresd[1293]: [49896][vldr]     <= parent: updating DS
Nov  3 08:26:24 ud kresd[1293]: [49896][vldr]     <= answer valid, OK
Nov  3 08:26:24 ud kresd[1293]: [17264][plan]   plan 'cz.' type 'DNSKEY'
Nov  3 08:26:24 ud kresd[1293]: [46784][iter]     'cz.' type 'DNSKEY' id was assigned, parent id 17264
Nov  3 08:26:24 ud kresd[1293]: [46784][cach]     => satisfied by exact RRset: rank 060, new TTL 17183
Nov  3 08:26:24 ud kresd[1293]: [46784][iter]     <= answer received:
Nov  3 08:26:24 ud kresd[1293]: ;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 46784
Nov  3 08:26:24 ud kresd[1293]: ;; Flags: qr aa  QUERY: 1; ANSWER: 0; AUTHORITY: 0; ADDITIONAL: 0
Nov  3 08:26:24 ud kresd[1293]: ;; QUESTION SECTION
Nov  3 08:26:24 ud kresd[1293]: cz.#011#011DNSKEY
Nov  3 08:26:24 ud kresd[1293]: ;; ANSWER SECTION
Nov  3 08:26:24 ud kresd[1293]: cz.                 #01117183#011DNSKEY#011256 3 13 GrWu3AwLX3b2yEVeTN4wvllu7Kay3roEADrhYloX9Y+KpJEqVp3gTt/eKBZboTl2pFy2rZFUfPGDGZWAlsLIGg==
Nov  3 08:26:24 ud kresd[1293]: cz.                 #01117183#011DNSKEY#011257 3 13 nqzH7xP1QU5UOVy/VvxFSlrB/XgX9JDJzj51PzIj35TXjZTyalTlAT/f7PAfaSD5mEG1N8Vk9NmI2nxgQqhzDQ==
Nov  3 08:26:24 ud kresd[1293]: cz.                 #01118000#011RRSIG#011DNSKEY 13 1 18000 20181115000000 20181101000000 20237 cz. uTYoVTcosQoaR/3NUDP25JSlzRf8XGJN+wdxQni9q3mmCx8SzpotoLyYmOnkuj9dORXDVrPW+TCGEiQwfoq9mg==
Nov  3 08:26:24 ud kresd[1293]: cz.                 #01118000#011RRSIG#011DNSKEY 13 1 18000 20181116125037 20181103053521 42928 cz. 7BG7Wwz2RMxyni7xcuCmIUKoypTeDAxn+/yqtFbWZi6gci8cDYuO6vsm4FVa6GN+R0bBEwQMxeTHi7hDYExDRA==
Nov  3 08:26:24 ud kresd[1293]: [46784][iter]     <= rcode: NOERROR
Nov  3 08:26:24 ud kresd[1293]: [46784][vldr]     <= parent: updating DNSKEY
Nov  3 08:26:24 ud kresd[1293]: [46784][vldr]     <= answer valid, OK
Nov  3 08:26:24 ud kresd[1293]: [54031][plan]   plan 'company.cz.' type 'DS' Nov  3 08:26:24 ud kresd[1293]: [ 1812][iter]     'company.cz.' type 'DS' id was assigned, parent id 54031 Nov  3 08:26:24 ud kresd[1293]: [ 1812][cach]     => skipping exact packet: rank 025 (min. 030), new TTL -58245
Nov  3 08:26:24 ud kresd[1293]: [ 1812][cach]     => trying zone: cz., NSEC3, hash 46c3ca06
Nov  3 08:26:24 ud kresd[1293]: [ 1812][cach]     => NSEC3 depth 1: hash fqs41urr02n4up4lv57mkp9lh7psa9ba
Nov  3 08:26:24 ud kresd[1293]: [ 1812][cach]     => NSEC3 sname: match proved NODATA, new TTL 83
Nov  3 08:26:24 ud kresd[1293]: [ 1812][cach]     => SOA missed
Nov  3 08:26:24 ud kresd[1293]: [ 1812][resl]     => querying: '10.0.0.1' score: 950 zone cut: 'cz.' qname: 'company.Cz.' qtype: 'DS' proto: 'udp'
Nov  3 08:26:24 ud kresd[1293]: [ 1812][iter]     <= answer received:
Nov  3 08:26:24 ud kresd[1293]: ;; ->>HEADER<<- opcode: QUERY; status: NOERROR; id: 1812
Nov  3 08:26:24 ud kresd[1293]: ;; Flags: qr rd ra cd  QUERY: 1; ANSWER: 0; AUTHORITY: 1; ADDITIONAL: 1
Nov  3 08:26:24 ud kresd[1293]: ;; EDNS PSEUDOSECTION:
Nov  3 08:26:24 ud kresd[1293]: ;; Version: 0; flags: do; UDP size: 4096 B; ext-rcode: Unused
Nov  3 08:26:24 ud kresd[1293]: ;; QUESTION SECTION
Nov  3 08:26:24 ud kresd[1293]: company.cz.#011#011DS
Nov  3 08:26:24 ud kresd[1293]: ;; AUTHORITY SECTION
Nov  3 08:26:24 ud kresd[1293]: [ 1812][iter]     <= rcode: NOERROR
Nov  3 08:26:24 ud kresd[1293]: [ 1812][resl]     <= server: '10.0.0.1' rtt: 10 ms
Nov  3 08:26:24 ud kresd[1293]: [ 1812][resl]     => resuming yielded answer
Nov  3 08:26:24 ud kresd[1293]: [ 1812][vldr]     <= bad NODATA proof
Nov  3 08:26:24 ud kresd[1293]: [ 1812][cach]     => stashed packet: rank 025, TTL 900, DS company.cz. (105 B) Nov  3 08:26:24 ud kresd[1293]: [ 1812][resl]     finished: 0, queries: 3, mempool: 65600 B
I have access to both DNS servers = our internal (bind9) and our external (knot).