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. -- Joe Yao ----------------------------------------------------------------------- This message is not an official statement of OSIS Center policies.
