On Wed, 13 Sep 2000, Howard Lowndes wrote:
> I have a user dials into my system to retrieve mail. As soon as the first
> email is sending the line hangs up.
>
> I have just realised that this email was one discussing the DD0S attacks I
> was suffering and mentions the +++ATH0 modem string in the text.
>
> Could the existence of this string be causing the hangup, it just seems
> strange that it would do such a thing, perhaps one of the two modems
> is not respecting the 1 second guard time? If it is then I know what the
> fix is.
It certainly could if one of your modems is the cheap nasty variety which
doesn't impliment the full Hayes command set.
This type of "attack" was common for some time until modem manufacturers
woke up to it.
Check your guard times. It's almost dead certain.
DaZZa
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