4,659 questions
DNS NSlookup Debugging TLD
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Alex Guerrero
0
Reputation points
I have been searching the internet and have not found the answer to my question and I don't know if this is the correct location to ask it. BUT when you are using the exhaustive debugging (set d2) option of nslookup, it seems to omit information? Either that or I don't know how it works properly (most likely the case). below I pasted some information to kind of explain what I am talking about. When you are on a subdomain and you attempt to nslookup anything not within your TLD it seems to not show any information above that. you can see when I nslookup facebook.com it "climbs" up the ladder from the subdomain that I am on from facebook.com.mcces.usmc.mil to facebook.com.usmc.mil but it seems to skip facebook.com.mil and the facebook.com. .If there is some sort of documentation I could read to learn more it would be greatly appreciated. This is not an issue but purely academic. Any assistance would be greatly appreciated!
C:\Users\alexander.guerrero>nslookup
Default Server: WOCCDC01.WOCC.USMC.MIL
Address: X.X.X.X
set d2
facebook.com
Server: WOCCDC01.WOCC.USMC.MIL
Address: X.X.X.X
SendRequest(), len 45
HEADER:
opcode = QUERY, id = 2, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
facebook.com.mcces.usmc.mil, type = A, class = IN
Got answer (102 bytes):
HEADER:
opcode = QUERY, id = 2, rcode = NXDOMAIN
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
facebook.com.mcces.usmc.mil, type = A, class = IN
AUTHORITY RECORDS:
-> mcces.usmc.mil
type = SOA, class = IN, dlen = 45
ttl = 900 (15 mins)
primary name server = mccesdc02.mcces.usmc.mil
responsible mail addr = hostmaster.mcces.usmc.mil
serial = 189488
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 86400 (1 day)
default TTL = 3600 (1 hour)
SendRequest(), len 45
HEADER:
opcode = QUERY, id = 3, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
facebook.com.mcces.usmc.mil, type = AAAA, class = IN
Got answer (102 bytes):
HEADER:
opcode = QUERY, id = 3, rcode = NXDOMAIN
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
facebook.com.mcces.usmc.mil, type = AAAA, class = IN
AUTHORITY RECORDS:
-> mcces.usmc.mil
type = SOA, class = IN, dlen = 45
ttl = 900 (15 mins)
primary name server = mccesdc02.mcces.usmc.mil
responsible mail addr = hostmaster.mcces.usmc.mil
serial = 189488
refresh = 900 (15 mins)
retry = 600 (10 mins)
expire = 86400 (1 day)
default TTL = 3600 (1 hour)
SendRequest(), len 39
HEADER:
opcode = QUERY, id = 4, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
facebook.com.usmc.mil, type = A, class = IN
DNS request timed out.
timeout was 2 seconds.
timeout (2 secs)
SendRequest failed
SendRequest(), len 39
HEADER:
opcode = QUERY, id = 5, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
facebook.com.usmc.mil, type = AAAA, class = IN
Got answer (101 bytes):
HEADER:
opcode = QUERY, id = 5, rcode = NXDOMAIN
header flags: response, want recursion, recursion avail.
questions = 1, answers = 0, authority records = 1, additional = 0
QUESTIONS:
facebook.com.usmc.mil, type = AAAA, class = IN
AUTHORITY RECORDS:
-> usmc.mil
type = SOA, class = IN, dlen = 50
ttl = 58 (58 secs)
primary name server = ns1-east.usmc.mil
responsible mail addr = mccog_nic_admins.usmc.mil
serial = 2022513010
refresh = 3600 (1 hour)
retry = 360 (6 mins)
expire = 604800 (7 days)
default TTL = 900 (15 mins)
SendRequest(), len 30
HEADER:
opcode = QUERY, id = 6, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
facebook.com, type = A, class = IN
Got answer (46 bytes):
HEADER:
opcode = QUERY, id = 6, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 0, additional = 0
QUESTIONS:
facebook.com, type = A, class = IN
ANSWERS:
-> facebook.com
type = A, class = IN, dlen = 4
internet address = 31.13.88.35
ttl = 130 (2 mins 10 secs)
Non-authoritative answer:
SendRequest(), len 30
HEADER:
opcode = QUERY, id = 7, rcode = NOERROR
header flags: query, want recursion
questions = 1, answers = 0, authority records = 0, additional = 0
QUESTIONS:
facebook.com, type = AAAA, class = IN
Got answer (58 bytes):
HEADER:
opcode = QUERY, id = 7, rcode = NOERROR
header flags: response, want recursion, recursion avail.
questions = 1, answers = 1, authority records = 0, additional = 0
QUESTIONS:
facebook.com, type = AAAA, class = IN
ANSWERS:
-> facebook.com
type = AAAA, class = IN, dlen = 16
AAAA IPv6 address = 2a03:2880:f111:181:face:b00c:0:25de
ttl = 130 (2 mins 10 secs)
Name: facebook.com
Addresses: 2a03:2880:f111:181:face:b00c:0:25de
31.13.88.35
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