Re: DNS Query Format
2005-03-24 11:04:39
Dave,
Which IP address? IP Address in the DNS Query - did you mean
response? The IP address of the requesting party is already known. Sorry
to be obtuse, but I really don't understand what you mean.
Could you please clarify?
Best,
Alan Maitland
WebMaster(_at_)Commerco(_dot_)Net
The Commerce Company - Making Commerce Simple(sm)
http://WWW.Commerco.Com/
At 09:21 AM 3/24/2005, you wrote:
It has been mentioned that the %{i} macro could be included in the
query, and then the server could reply with PASS/FAIL. I think this is a
bad idea, because all those queries are uncacheable, so this truly
circumvents the benefits that were designed into DNS. When the DDOS
attempt does happen, caching can really help lower the impact. It may be
that I didn't understand the proposal well enough.
Good point. I hadn't thought of that. Also, since the PASS/FAIL
response takes the same single IP datagram as a list of IPs, there is not
much to be gained.
One more thought on this topic: Even though we see no advantage now in
having a DNS server reply with a PASS/FAIL, would it be a good idea to
include the IP address in the DNS query anyway? That will add a
negligible 4 bytes to the query, and will allow for some future use of
this information. This might be, for example, a daemon that alerts a
domain owner when an IP in their domain attempts an unauthorized use of
the domain name. ( A zombie catcher !! )
I raise this question now, because it will be a lot easier to modify the
standard now than later.
-- Dave
************************************************************* *
* David MacQuigg, PhD * email: dmquigg-spf(_at_)yahoo(_dot_)com *
*
* IC Design Engineer * phone: USA 520-721-4583 * * *
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- DNS Query Format, David MacQuigg
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