Queries regarding forwarders

Blason R blason16 at gmail.com
Wed Aug 8 14:02:56 UTC 2018


Hi there,

I am bit confused about DNS forwarders. I have two BIND Servers one is
being used as Authoritative DNS server which has forwarder set to other
server like this

Auth Server  for xvyz.com 192.168.3.15
Recursive Server 192.168.3.44

Now if I am debugging from client side using -debug option I see
192.168.3.15 is directly resolving with ROOT DNS Servers though I have
recursive no; option set in my BIND config. Ideally the query should have
gone to 192.168.3.44 but in debug I am seeing the below output.

Well how do I trace if forwarding is happening?

************************
C:\Users\Administrator>nslookup -type=a -debug www.cisco.com
------------
Got answer:
    HEADER:
        opcode = QUERY, id = 1, rcode = NOERROR
        header flags:  response, auth. answer, want recursion, recursion
        questions = 1,  answers = 1,  authority records = 2,  additional

    QUESTIONS:
        15.3.168.192.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  15.3.168.192.in-addr.arpa
        name = dns.xyz.com
        ttl = 10800 (3 hours)
    AUTHORITY RECORDS:
    ->  3.168.192.in-addr.arpa
        nameserver = dns02.xyz.com
        ttl = 10800 (3 hours)
    ->  3.168.192.in-addr.arpa
        nameserver = dns.xyz.com
        ttl = 10800 (3 hours)
    ADDITIONAL RECORDS:
    ->  dns.xyz.com
        internet address = 192.168.3.15
        ttl = 10800 (3 hours)
    ->  dns02.xyz.com
        internet address = 192.168.3.14
        ttl = 10800 (3 hours)

------------
Server:  dns.xyz.com
Address:  192.168.3.15

------------
Got answer:
    HEADER:
        opcode = QUERY, id = 2, rcode = NOERROR
        header flags:  response, want recursion, recursion avail.
        questions = 1,  answers = 5,  authority records = 13,  additiona

    QUESTIONS:
        www.cisco.com, type = A, class = IN
    ANSWERS:
    ->  www.cisco.com
        canonical name = www.cisco.com.akadns.net
        ttl = 838 (13 mins 58 secs)
    ->  www.cisco.com.akadns.net
        canonical name = wwwds.cisco.com.edgekey.net
        ttl = 299 (4 mins 59 secs)
    ->  wwwds.cisco.com.edgekey.net
        canonical name = wwwds.cisco.com.edgekey.net.globalredir.akadns.
        ttl = 14531 (4 hours 2 mins 11 secs)
    ->  wwwds.cisco.com.edgekey.net.globalredir.akadns.net
        canonical name = e2867.dsca.akamaiedge.net
        ttl = 3599 (59 mins 59 secs)
    ->  e2867.dsca.akamaiedge.net
        internet address = 23.57.126.108
        ttl = 19 (19 secs)
    AUTHORITY RECORDS:
    ->  net
        nameserver = a.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = l.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = e.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = i.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = d.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = f.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = b.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = h.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = g.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = c.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = k.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = j.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ->  net
        nameserver = m.gtld-servers.net
        ttl = 4663 (1 hour 17 mins 43 secs)
    ADDITIONAL RECORDS:
    ->  m.gtld-servers.net
        internet address = 192.55.83.30
        ttl = 103500 (1 day 4 hours 45 mins)
    ->  m.gtld-servers.net
        AAAA IPv6 address = 2001:501:b1f9::30
        ttl = 163960 (1 day 21 hours 32 mins 40 secs)
    ->  d.gtld-servers.net
        internet address = 192.31.80.30
        ttl = 77579 (21 hours 32 mins 59 secs)

------------
Non-authoritative answer:
Name:    e2867.dsca.akamaiedge.net
Address:  23.57.126.108
Aliases:  www.cisco.com
          www.cisco.com.akadns.net
          wwwds.cisco.com.edgekey.net
          wwwds.cisco.com.edgekey.net.globalredir.akadns.net


C:\Users\Administrator>
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