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Useful Links

1. nslookup

2. set type=any

3. can now query domains e.g. sch.uk

4. server servername e.g. server ns0.ja.net can then query the server

5. ls -t ns domainname e.g. ls -t ns sch.uk lists all the domains under the domain entered

6. ls -d domainname gives an alternative listing

Using nslookup to investigate too many hops problems

1. Check mail exchanger for sender
   1. enter nslookup
   2. set type=any
   3. enter domainname which will give you the mail exchanger

2. enter traceroute mail_exchange to show route it takes

Can also do nslookup -querytype=mx name to check it exists

Finding the Authoritive NameServer for an IP Address

For this example we want to find the master server for 10.10.194.45

1. Enter nslookup

2. > 10.10.194.45 - if this resolves you will get the fully qualified name

3. > set domain=domainname

4. > set debug

5. > 10.10.194.45 - gives authoritive records and name servers e.g
   10.IN-ADDR.ARPA nameserver=nameserver.bobblehat.com

6. > nameserver - gives IP address of nameserver

7. > server IP_address_of_nameserver

8. > ls -d 10.IN-ADDR.ARPA - shows contents of database

9. > exit