nanog mailing list archives

Re: Purchased IPv4 Woes


From: Rob McEwen <rob () invaluement com>
Date: Sun, 12 Mar 2017 14:40:24 -0400

On 3/12/2017 2:00 PM, Baldur Norddahl wrote:
Sorry but this is not true. The address space does not lose that much in
value and in fact most address space that has been used for end users is
already tainted in the same way (due to botnets etc).

Also, you're comparing apples-to-oranges. Dynamically allocated IPs for "end users" are not suppose to host mail and web servers - at least not professional and high-quality hosting services. This is why their outbound speed is almost always governed down to a trickle (often order of magnitudes slower then the download speeds), and port 25 is often blocked (when not headed to the mail server hosted by the particular ISP which controls that space).

Such IPs are OFTEN preemptively blacklisted by Spamhaus's PBL list:

https://www.spamhaus.org/pbl/

If someone wants to run a mail server (or even a web server) from such space - then they have a whole bunch of OTHER problems besides who/what damaged the space before they acquired it. Their first problem is that they are trying to tow a boat with their bicycle.

--
Rob McEwen



Current thread: