I'm experimentally rejecting unlisted IP addresses that don't reverse resolve. Probably the wrong thing to do, but how bad is this? I've noted that a few important sites don't reverse resolve. What percentage of sites on the Internet don't have a reverse PTR record and why? Is it legitimate for their to be no reverse record when one site is hosted on the IP block of another?
I'm looking to keep what I'm doing simple where I want to do something with the DNS infrastructure to make my spam wall stronger. One thought is to have a white list of IP addresses in cases where there is no reverse name resolution. I simply have to check the white list prior to rejecting an IP for not being reverse listed. This approach is a patching approach though and patches make things more complex. _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
