On Sep 23, Thomas Bushnell BSG <tb@becket.net> wrote: > Ok, so given that definition (I don't care much about the definition; > I'm not interested in the semantics), how do you propose that anyone > could ever determine remotely whether an IP address was allocated by > DHCP or not (other than by having the ISP tell you, of course, though > even that might not do the trick: some people have a static IP > address, but the ISP has also helpfully arranged for them to get a > DHCP reply that provides that address)? How it is assigned is obviously (?) not important in this context. An IP address is usually considered "dynamic" if it is shared among many users (so NAT outside addresses may qualify as well). Very good ISPs report dynamic pools themselves to the DULs. Good ISPs mark dynamically-assigned addresses in the whois database or in the rDNS. Bad ISPs do nothing of this, and DULs maintainers have to take some educated guesses. This works usually well (I'm marginally involved with maintenance of a major DUL, so I know what I am talking about) and mistakes are usually corrected in less than one day after affected users complain. Again, we see that if you want good service you need to buy it from a good ISP. If you get bad service, the rest of the network will make you suffer. In the end, it's still the issue of minimizing the number false positives over spams rejected. For me a good DNSBL has very acceptable results, YMMV. -- ciao, | Marco | [8154 opdOQSXnYKBdU]
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