<div dir="ltr"><div>With respect to the query root name servers, and then the drop down for other servers when walking the tree, depending on the tool you're using, be very careful to ensure you're not actually walking the tree and hitting a cached answer. named can hand back very different answers sometimes depending on what the rules of invalidation run.<br>
<br></div>I suppose the feature there is the ability to compare the responses of every server in the tree, direct from the server, and confirm they all line up, including the final servers. I've come across far too many examples of sites where their "load balancing" devices are handing back different zones from each other, and sometimes with broken SOA and NS records. This is where the rules of invalidation then cause issues, and it takes a fair bit of care to assess that by hand. If you would like some examples, I can certainly dig them up (I prefer not to publicly name the guilty parties, rather educate)<br>
<div><div><div><div class="gmail_extra"><br></div><div class="gmail_extra">Definitely a handy tool all the same, it's in my bookmarks now. Thankyou :) <br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 1, 2014 at 11:15 PM, Michael Dale <span dir="ltr"><<a href="mailto:mdale@dalegroup.net" target="_blank">mdale@dalegroup.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">So my current list is:<br>
<br>
- Query root name servers<br>
- Connect to MX records and display first response (might not be a great idea??)<br>
- Drop down list of other common DNS servers to query<br>
- PTR records for various things<br>
- Validate domain names better<br>
- Better IPv6 support<br>
- Better rDNS support<br>
- Try and do an AXFR (I think this would be useful)<br>
- Better reporting<br>
- Some TTL stuff<br>
<br>
Lots!<br>
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<br></blockquote></div><br></div></div></div></div></div>