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- dnswalk 1.8.3 - Nov 1994
-
- Author: David Barr <barr@pop.psu.edu>
- $Id: README,v 8.1 1996/10/25 04:57:15 vixie Exp $
-
- INTRO
-
- dnswalk is a DNS debugger. It performs zone transfers of specified
- domains, and checks the database in numerous ways for internal
- consistency, as well as accuracy.
-
- dnswalk requires perl and dig. (Tested under perl-4.036, dig 2.0, and
- the dig shipped with BIND 4.9.x) If you do not have these tools, get
- them. (perl is assumed to be in /usr/local/bin, edit the first line of
- dnswalk if it is not)
-
- They can be found by anonymous ftp at:
- ftp.uu.net:/networking/ip/dns/dig.2.0.tar.Z
- ftp.uu.net:/systems/gnu/perl-*.tar.Z
- gatekeeper.dec.com:/pub/BSD/bind/4.9/4.9.*.tar.Z
-
- dnswalk works much better if you use the dig that is packaged
- with the BIND 4.9.x distribution. (It is much less buggy than its
- predecessor)
-
- dnswalk is not for the faint of heart. It should NOT be
- used without a firm knowledge of the DNS RFC's. If you use this
- tool for cracking or otherwise evil purposes, the author hereby
- considers you a slime-ball. See the end of this README file for
- a list of good reading material.
-
- dnswalk is not the be-all end-all tool for checking the
- integrity of your DNS database. I would suggest it be used after
- using 'doc', written by Steve Hotz (hotz@isi.edu) and Paul Mockapetris
- (pvm@isi.edu). It can be found via FTP from:
- ftp.uu.net:/networking/ip/dns/doc.2.0.tar.Z
-
- dnswalk is not a replacement for doc. This was written to
- check individual database entries, while 'doc' ensures that the overall
- database structure and authority records are consistent. dnswalk may
- not even function correctly if authority records are missing or
- incorrect.
-
- This program may be freely distributed, as long as this notice
- and documentation are distributed with the program. This program is
- released as-is, with no warranty expressed or implied. Some assembly
- required, contents may settle during shipment. This program can be
- found in:
- ftp.pop.psu.edu:/pub/src/dnswalk/ or the mirrors:
- ftp.uu.net:/networking/ip/dns/dnswalk/*
- ftp.edu.tw:/UNIX/networking/dns/dnswalk/*
- ftp.univ-lyon1.fr:/pub/unix/network/tcpip/dns/dnswalk/*
-
-
- dnswalk tends to produce lots of output, so I'd suggest
- redirecting this into a file of your choice. I debated using doc's
- strategy of automatically putting it in a logfile, but decided not
- to. (The author reserves the right to change his mind) For small,
- mostly-correct domains it is pretty manageable, however. For larger
- domains, use the included 'do-dnswalk' script as a guide.
-
- If you use the recursive option, you will get a directory tree
- corresponding exactly to the DNS hierarchy. I must stress that
- you use the recursive option with care, and the author calls you a
- slime-ball again if you use this for evil purposes.
-
- Please refer to the man page on what dnswalk checks for, and
- the format of the output.
-
- *** NOTICE ***
- I fully realize that while some of the rules are not in
- violation of an RFC, it might be wise to reconsider their usage
- anyway. dnswalk was written to be a tool to let the hostmaster decide
- what are troublesome areas, not as a program that has all the answers.
- *** NOTICE ***
-
- This program was tested with data from the psu.edu domain. If your
- site does things differently than the way we do things, then you
- may see it report things as errors, when in fact they are "okay".
- If you notice something not being reported, or something reported that
- is not an error, please send me output! I fully admit that I'm not
- an expert in DNS and the requirements. My rules tend to be skewed to
- my personal feelings about what "nice" DNS databases look like. Others
- are free to differ. (and tell me so)
-
- Author:
- David Barr - System Administrator
- The Pennsylvania State University Population Research Institute
- <barr@pop.psu.edu>
-
- Thanks:
-
- Bill Fenner - tips with perl
-
- BUGS FIXED
-
- added equal() routine and changed all string comparisons to use it
- instead. equal() does case-insensitive comparisons. This was causing
- several problems with mixed case host and domain names in various
- places.
-
- checks for invalid PTR records now skip addresses ending in ".0".
-
- shortened error messages so they are more likely to fit in 80 columns
-
- handles failed zone transfers better. You can't trust dig to return
- a non-zero return code if the transfer fails, so I parse the output
- myself to see if it contains an SOA record to prove that it is 'valid'.
-
- sorts output by zone. Also displays server of authority and the
- contact for the zone. (So you know who to bug :-) )
-
- produced erroneous warnings regarding having only one authoratative
- nameserver for a zone. It now warns correctly.
-
- [ BUGS now moved to CHANGES file ]
-