Re: Computer systems blamed for feeble hurricane response?

[Joseph S D Yao <jsdy () center osis gov>]

On Tue, Sep 13, 2005 at 05:54:03PM -0400, Steven M. Bellovin wrote:
> In message <20050913212312.GM16110 () core center osis gov>, Joseph S D Yao writes
> :
> > On Tue, Sep 13, 2005 at 04:56:58PM -0400, Joseph S D Yao wrote:
> > > On Tue, Sep 13, 2005 at 04:28:41PM -0400, Steven M. Bellovin wrote:
> > > ...
> > > > Telnet options, and for that matter speed, happen after the 3-way 
> > > > handshake.  We're not getting that far.
> > > >
> > > >          --Steven M. Bellovin, http://www.cs.columbia.edu/~smb
> > >
> > > Steve, I defer to your expertise, as always.  ;-]
> >
> >
> > Nevertheless ... I went looking for comments on how this was being done,
> > and found the following specualtion by a small number of different
> > people.
> >
> > "SEF [is] unique in that it can detect what appear to be telnet
> > connections to Port 25 and drop the connection. This is probably because
> > telnet connections send one character at a time whereas real SMTP
> > clients send all the strings at once."
> >
> > This would not require the 3WH, ISTM.
>
> Sure it would -- until the 3-way handshake, there's no application data 
> flowing, and hence no characters being sent one at a time.

Right.  Doh.  Me go home lie down rest.

> We'll leave to another mailing list the question of what security 
> benefit there is to such a feature...

;-)

-- 
Joe Yao
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