DNS Query Format
2005-03-24 09:21:39
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 *
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* IC Design Engineer * phone: USA 520-721-4583 * * *
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