On Wed, 31 Mar 2004, Douglas F. Calvert wrote:
I am interested in finding out what the motivation is for requiring valid reverse address lookups before connecting to a daemon. I have heard a number of different explanations, the majority of the responses point to history/tradition and tcpwrappers. Is there a commonly accepted justification for this practice? In my opinion it does not appear to increase the validity of the connection. But I may be missing something obvious. Thanks in advance...
Well, my understanding is that whilst its easy to get a domain name and some dns its usually quite difficult to put in a ptr record, these are usually controlled by the ISP. If they dont exist or dont match then the address is a dialup or hijacked or something not legitimate.. I think this is mainly an smtp antispam thing tho altho I see your point is for any connection is general, I guess the same appliers to hackers as to spammers.. ? Steve