Nix wrote:
On 21 Aug 2007, Kai Schaetzl said:
Nix wrote on Tue, 21 Aug 2007 09:26:18 +0100:
It's not dynamic, but Botnet isn't just looking for dynamic IPed hosts, but
also hosts with e.g. the string `adsl' in its rDNS, even if that host happens
to have a static assignment.
Well, if it's static they can give you rDNS and you can use a hostname of your
choice for A and PTR.
My ISP doesn't give me that option (well, OK, it probably gives *me*
that option because I can bug the ISP's technical director, but not
people who've posted bonds). I'd venture to guess that the vast majority of
small business UK ISPs, even those that do not provide useful outbound relaying
MTAs, do not delegate rDNS to individual users.
And they can't set one of the MX records, or A records, for their mail
domain to be the same as that of the static IP address their static IP
address?
Because EITHER one of those things will trigger an exception for Botnet.
(Of course, this is all sophistry to an extent: right now the vast
majority of mail sent directly from ADSL lines *is* probably sent from
botted hosts. :( )
Right... which pretty much confirms the motivation behind Botnet.
Yes, it's a _policy_ based mechanism instead of a "spam detection"
mechanims, but the sad truth is that it works MUCH more often than it fails.
