nanog mailing list archives
Re: Computer systems blamed for feeble hurricane response?
From: "Steven M. Bellovin" <smb () cs columbia edu>
Date: Tue, 13 Sep 2005 17:54:03 -0400
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/~smbSteve, 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. 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
Current thread:
- Re: Computer systems blamed for feeble hurricane response?, (continued)
- Re: Computer systems blamed for feeble hurricane response? Suresh Ramasubramanian (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? william(at)elan.net (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Larry Smith (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Joseph S D Yao (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Mike Tancsa (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Joseph S D Yao (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Steven M. Bellovin (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Joseph S D Yao (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Joseph S D Yao (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Joseph S D Yao (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Steven M. Bellovin (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Joseph S D Yao (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Eric A. Hall (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? William Allen Simpson (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Valdis . Kletnieks (Sep 13)
- Message not available
- Re: Computer systems blamed for feeble hurricane response? Mike Tancsa (Sep 13)
- Re: Computer systems blamed for feeble hurricane response? Suresh Ramasubramanian (Sep 14)
- Re: Computer systems blamed for feeble hurricane response? Mike Tancsa (Sep 14)
- mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) william(at)elan.net (Sep 13)
- mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) Roy Badami (Sep 13)
- Re: mail service with no mx (was - Re: Computer systems blamed for feeble hurricane response?) william(at)elan.net (Sep 13)