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Re: Computer systems blamed for feeble hurricane response?
- From: Steven M. Bellovin
- Date: Tue Sep 13 17:55:15 2005
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
>"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.
We'll leave to another mailing list the question of what security
benefit there is to such a feature...
--Steven M. Bellovin, http://www.cs.columbia.edu/~smb