[Mimedefang] filter_relay

Aleksandar Milivojevic amilivojevic at pbl.ca
Mon Nov 1 09:30:06 EST 2004

Ben wrote:
> Where that would help up is if the ISP's purposefully set up DNS for 
> DHCP and dialup addresses to NOT be correct... and instantly, all those 
> typically zombied addresses would become useless....

Actually, the trend is opposite.  More and more ISP's are dynamically 
updating DNS so that each user has distinct DNS name (for example, cable 
users more and more often have MAC address of their Ethernet card as DNS 
name).  Something like dynamic DNS.  This speeds up resolving of abuse 
complaints.  Give them the DNS name, and they know who it is, they don't 
need to look into (usually huge) logs to find out who was using 
particular IP address at particular point in time.  It also gives 
advanced customers a reason to use this ISP instead of the other.

Anyhow, even if ISP's start to set up DNS incorrectly for DHCP and 
dialup customers, viruses and worms would simply adapt to it.  No gain 
there.  And we end up with screwed DNS, resulting in slower response of 
ISP's to abuse complaints.

Aleksandar Milivojevic <amilivojevic at pbl.ca>    Pollard Banknote Limited
Systems Administrator                           1499 Buffalo Place
Tel: (204) 474-2323 ext 276                     Winnipeg, MB  R3T 1L7

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