September 2001
Intermediate to advanced
352 pages
11h 1m
English
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Good Parenting
Now that the delegation to the fx.movie.edu name servers is in place, we—responsible parents that we are—should check that delegation using host. What? We haven’t given you host yet? A version of host that works on Windows 2000 is available via anonymous ftp from ftp://ftp.nikhef.nl/pub/network/host_970908.exe.Z. To uncompress host, you’ll need WinZip or a similar Windows utility. WinZip is available from http://www.winzip.com.
Once you uncompress host_970908.exe, install it
as host.exesomewhere on
your computer. (We install it in the same directory as
nslookup.exe.) Next, set up a
resolv.conffile in your
%WINDIR%directory. (If
you’re not sure where %WINDIR%is, type set from a DOS
prompt.)
hostmakes it easy to check
delegation. With host
, you
can look up the NS records for your zone on your parent zone’s
name servers. If those look good, you can use
hostto query each name
server listed for the zone’s SOA record. The query is
nonrecursive, so the name server queried doesn’t query other
name servers to find the SOA record. If the name server replies,
host checks the reply to see whether the
aa (authoritative
answer) bit in the reply packet is set. If it is, the name server
checks to make sure that the packet contains an answer. If both these
criteria are met, the name server is flagged as authoritative for the
zone. Otherwise, the name server is not authoritative, and
host reports an error.
Why all the fuss over bad delegation? Incorrect delegation can slow ...
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