Re: [Asrg] BCP Idea: Move dynamic IP addresses to designated areas

["George Ou" <george_ou at netzero.com>]

----- Original Message ----- 
From: "Walter Dnes" <waltdnes at waltdnes.org>
To: "ASRG list" <asrg at ietf.org>
Sent: Thursday, July 01, 2004 12:56 PM
Subject: [Asrg] BCP Idea: Move dynamic IP addresses to designated areas


>   A lot of time and energy is going into trying to set up schemes to
> identify who is/isn't allowed to send email.  Some of these ideas
> involve inventing new DNS records.  This will take a long time to
> implement in real-life.
>
>   I suggest instead, that certain IP address ranges be set aside for IP
> addresses that are not authorised to send email on port 25 to anybody
> other than their ISP's gateway MTA (aka "smart host").  I reluctantly
> blocked 24.0.0.0/8 sending direct to my personal domain last month.
> 797 out of 2997 (i.e. 26.5%) blocked email delivery attempts last month
> were from that one /8.  This range is already blocked by many MTAs, why
> not make it official?  There are obviously more than 16 million dynamic
> addresses on the planet, so other ranges will need to be added.  Unlike
> other proposals, which require modifications to DNS, this idea only
> requires shuffling around of existing address ranges.  ACLs and DNSbls
> already exist, and would work even better when my idea is implemented.
>
>   Comments, suggestions ?

When you say "modifications" to DNS.  Are you implying that this would
somehow require a code change in the DNS servers of the world?  That is not
requred by SenderID (consolidated CallerID and SPF).  It doesn't take much
to implement SenderID.  You just need to add a SenderID record to your DNS
server.


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