RE: Spamhaus...

["Tomas L. Byrnes" <tomb () byrneit net>]

> -----Original Message-----
> From: William Herrin [mailto:bill () herrin us]
> Sent: Sunday, February 21, 2010 10:02 AM
> To: Rich Kulawiec
> Cc: nanog () nanog org
> Subject: Re: Spamhaus...
>
> On Sun, Feb 21, 2010 at 9:10 AM, Rich Kulawiec <rsk () gsp org> wrote:
> > Hint: nothing stops the spammers from pointing the MX records for
> their
> > throwaway domains at somebody else's mail servers.  Among other
> things.
> > MANY other things, unfortunately.
>
> Rich,
>
> Clearly I shouldn't respond to any packets at all. After all, a bad
> actor can originate packets with a forged source address and I
> wouldn't want to abuse your network with unwanted echo-replies,
> syn-acks and rejs.
>
> Regards,
> Bill Herrin
[Tomas L. Byrnes] 
Maybe he should avoid any traffic on any non Point to Point only link with no repeaters, as there's always the 
possibility of a beaconing station or someone with SQE turned on.

Reductio ad absurdam; which, btw, is never a valid argument for, or against.

P.S. I once wrote code to change line idle code on Multi-drop X.25 from 7E to FF, because AT&T ignored DTR and had all 
their MJUs run wide open, thereby destroying a NRZI multidrop 56kbps digital circuit, so the above scenario is not 
fictitious. Needless to say, pulling the plug was not an option.