ietf-clear
[Top] [All Lists]

Re: [clear] CSV-CSA: Is A query done on the EHLO domain

2005-09-02 17:01:57



When authenticating the EHLO domain, is only a SRV query done or
does the SMTP server first do an A lookup on the domain name to see
if the resulting IP address matches the connection IP address?

It appears that the text implies that the SRV record will contain
the appropriate A record for the domain name (in the additional data
section), so an explicit A lookup is not needed (unless the SRV query
result fails to provide the necessary A record).


From the CSV spec:

Authentication:
...
The response to a CSV authentication query usually includes the list of associated IP addresses in the Additional Information section. Formally, this additional information is the same as would be obtained from additional queries for that information. A server includes it in the CSV query for efficiency, to avoid additional DNS queries.


1. The language here does not make an "implication". It states a behavior quite explicitly and it explains why it happens and why it is not required to happen.

2. What can be returned in Additional Information is the logical equivalent of doing an A record query; if it is not returned then an A record query must be done.

--

  d/

 Dave Crocker
 Brandenburg InternetWorking
 +1.408.246.8253
 dcrocker  a t ...
 WE'VE MOVED to:  www.bbiw.net
_______________________________________________
ietf-clear mailing list
ietf-clear(_at_)mipassoc(_dot_)org
http://mipassoc.org/mailman/listinfo/ietf-clear

<Prev in Thread] Current Thread [Next in Thread>