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- Newsgroups: comp.protocols.tcp-ip
- Path: sparky!uunet!noc.near.net!vaxeline.ftp.com!cream.ftp.com!jbvb
- From: jbvb@vax.ftp.com (James B. VanBokkelen)
- Subject: Re: TCP_URG, does it lower security?
- Message-ID: <921211144803@cream.ftp.com>
- Nntp-Software: PC/TCP NNTP
- Keywords: TCP Urgent
- Lines: 20
- Sender: root@vaxeline.ftp.com (vaxeline.ftp.com root account)
- Nntp-Posting-Host: whipped-cream.ftp.com
- Reply-To: jbvb@ftp.com
- Organization: FTP Software, Inc., Wakefield, MA
- References: <1fo1b1INNcvd@usenet.INS.CWRU.Edu> <ByqyM2.Ex1@mentor.cc.purdue.edu> <1foc4jINNkuf@usenet.INS.CWRU.Edu> <Byr4oo.I0K@mentor.cc.purdue.edu>
- Date: Fri, 11 Dec 1992 14:48:03
-
- In article <Byr4oo.I0K@mentor.cc.purdue.edu> dls@mentor.cc.purdue.edu (David L Stevens) writes:
-
- More seriously, even if it falls within the window, you aren't supposed
- to sit on it until you fill in any gaps of data that may appear before the
- urgent data.
-
- Yes, you are, if you subscribe to RFC 793/1122 Urgent (in-band) instead
- of 4bsd out-of-band. You let the application know that Urgent data is
- in the pipe, but you have to deliver the bytes in order, including the
- ones immediately before and after the Urgent pointer (RFC 793/1122
- doesn't specify a single byte as the Urgent one).
-
- I have proof that it is possible to build a TCP API on which you can
- do both Telnet Synch and encrypted Klogin (an example of the possible
- awkwardness of OOB, since passing the terminal mode as an OOB byte by
- nature means that it can't be encrypted along with all the rest of
- the data).
-
- James B. VanBokkelen 2 High St., North Andover, MA 01845
- FTP Software Inc. voice: (508) 685-4000 fax: (508) 794-4488
-
-