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[public-dns-discuss] I can not access "mall.epost.go.kr, www.epost.go.kr ..." using Google public DNS






      → No access to overseas users from October 26
        USA and Korea etc.
        All platforms(windows, etc.)
       → mall.epost.go.kr, biz.epost.go.kr, www.epost.go.kr, etc. 
       → constantly
       → https://intodns.com/epost.go.kr
       → http://dnsviz.net/d/www.epost.go.kr/dnssec/


       - Step 1: Check to see if the authoritative name servers are correct
www.epost.go.kr-2018-10-29-06_34_20-UTC.png











    - Step 2: Verify that your client can communicate with the Google Public DNS servers


tracert.PNG













   - Step 3: Verify that Google Public DNS can resolve the selected hostname

C:\Users\n83ksjeon2018>nslookup -debug www.epost.go.kr 8.8.8.8
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 1, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        8.8.8.8.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  8.8.8.8.in-addr.arpa
        name = google-public-dns-a.google.com
        ttl = 21599 (5 hours 59 mins 59 secs)

------------
서버:    google-public-dns-a.google.com
Address:  8.8.8.8

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.5fcafe.ncia.local, type = A, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86389 (23 hours 59 mins 49 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 3, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.5fcafe.ncia.local, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86387 (23 hours 59 mins 47 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 4, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.ncia.local, type = A, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86395 (23 hours 59 mins 55 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 5, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.ncia.local, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86382 (23 hours 59 mins 42 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 6, rcode = SERVFAIL
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        www.epost.go.kr, type = A, class = IN

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 7, rcode = SERVFAIL
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        www.epost.go.kr, type = AAAA, class = IN

------------
*** google-public-dns-a.google.com이(가) www.epost.go.kr을(를) 찾을 수 없습니다
 Server failed

C:\Users\n83ksjeon2018>nslookup -debug www.epost.go.kr 8.8.8.8
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 1, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 1,  authority records = 0,  additional = 0

    QUESTIONS:
        8.8.8.8.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  8.8.8.8.in-addr.arpa
        name = google-public-dns-a.google.com
        ttl = 21599 (5 hours 59 mins 59 secs)

------------
서버:    google-public-dns-a.google.com
Address:  8.8.8.8

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.5fcafe.ncia.local, type = A, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86390 (23 hours 59 mins 50 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 3, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.5fcafe.ncia.local, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86393 (23 hours 59 mins 53 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 4, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.ncia.local, type = A, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86394 (23 hours 59 mins 54 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 5, rcode = NXDOMAIN
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 1,  additional = 0

    QUESTIONS:
        www.epost.go.kr.ncia.local, type = AAAA, class = IN
    AUTHORITY RECORDS:
    ->  (root)
        ttl = 86398 (23 hours 59 mins 58 secs)
        primary name server = a.root-servers.net
        responsible mail addr = nstld.verisign-grs.com
        serial  = 2018103002
        refresh = 1800 (30 mins)
        retry   = 900 (15 mins)
        expire  = 604800 (7 days)
        default TTL = 86400 (1 day)

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 6, rcode = SERVFAIL
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        www.epost.go.kr, type = A, class = IN

------------
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 7, rcode = SERVFAIL
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 0,  authority records = 0,  additional = 0

    QUESTIONS:
        www.epost.go.kr, type = AAAA, class = IN

------------
*** google-public-dns-a.google.com이(가) www.epost.go.kr을(를) 찾을 수 없습니다
 Server failed

C:\Users\n83ksjeon2018>



  - Step 4: Verify that Google Public DNS can resolve the selected hostname without performing DNSSEC validation


C:\Users\n83ksjeon2018>nslookup www.epost.go.kr 4.2.2.1
서버:    a.resolvers.level3.net
Address:  4.2.2.1

권한 없는 응답:
이름:    node13.www-epost-go-kr.nciashield.org
Address:  211.250.131.141
Aliases:  www.epost.go.kr
          www-epost-go-kr.nciashield.org


C:\Users\n83ksjeon2018>nslookup www.epost.go.kr 4.2.2.2
서버:    b.resolvers.Level3.net
Address:  4.2.2.2

권한 없는 응답:
이름:    node13.www-epost-go-kr.nciashield.org
Address:  211.250.131.141
Aliases:  www.epost.go.kr
          www-epost-go-kr.nciashield.org


C:\Users\n83ksjeon2018>nslookup www.epost.go.kr 208.67.222.222
서버:    resolver1.opendns.com
Address:  208.67.222.222

권한 없는 응답:
이름:    node13.www-epost-go-kr.nciashield.org
Address:  211.250.131.141
Aliases:  www.epost.go.kr
          www-epost-go-kr.nciashield.org


C:\Users\n83ksjeon2018>nslookup www.epost.go.kr 208.67.220.220
서버:    resolver2.opendns.com
Address:  208.67.220.220

권한 없는 응답:
이름:    node13.www-epost-go-kr.nciashield.org
Address:  211.250.131.141
Aliases:  www.epost.go.kr
          www-epost-go-kr.nciashield.org




Overseas users "www.epost.go.kr, etc." This is an issue that we are not able to connect. Please give me a solution so that it can be resolved quickly.



Thank you.









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