Re: Internet host SMTP server survey 2003-11

Charles,Charles Cazabon wrote:
> I looked up PTR records for 1000000 random non-RFC1918 IP addresses. 

Could someone explain for me the significance of PTR records to this 
survey?

> Evidently the Internet now has about 278
> million IP addresses with PTR records.

How did you get this?  Is it a linear extrapolation?

>   57991 connections timed out;

Does this mean that the server accepted a connection on port 25, but 
never said 220?  What is the time out period?  When a connection times 
out, which machine cuts the connection, your client or the server?

Thank you,
Rich Hammer
Hillsborough, N.C.