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- Network Working Group Jon Postel (SRI-ARC)
- Request for Comments: 719 Jul 76
- NIC #36138
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- Discussion on RCTE
-
- The following is the significant portion of a dialog on RCTE that has
- followed the publication of RFC 718.
-
- 15-Jul-76 Nancy Mimno (BBN-NET)
-
- Jon,
- I've read RFC718 and have got some comments, in particular with
- respect to the "third problem" or clearing the input buffer part.
-
- 1) I believe the stated implementation is backwards: in the normal
- case of the RCTE mode negotiation, the server sends "WILL RCTE" and
- the user sends ,"DO RCTE"; the reverse case is thus the server sending
- "DO RCTE" and the user "WILL RCTE" Also, it is probably wise to say
- explicitly that the server's sending "DO RCTE" requires the user
- process to respond "WILL (or WON'T) RCTE" and that this response is
- the synchronizing mark.
-
- 2) The problem is a real one and I think the RCTE protocol would be
- better with a "clear input, reset counters" function. The question is
- Ill now to do it. In talking with Rav yesterday, I learned that he had
- this in mind as a general function, not restricted to RCTE; in fact,
- TENEX sends the "reverse RCTE" option for "clear your input buffer"
- whether or not the connection is in RCTE mode. In this case, the
- statement about "cannot be confused with the normal use of the RCTE
- option" will not always be true. I think we both agreed that the
- current solution should just be an interim one.
-
- 3) I suggest a different way of performing this function, using the
- synch-datamark sequence. First, the RCTE option would have to
- explicitly require that this function reset the counters and cause a
- "clear your input buffer (of data)", all synchronized with the
- datamark of course. This is pretty much what it is now except for
- the reset counters; receiving Synch-data mark when in RCTE probably
- needed defining anyhow. Because RCTE won't work unless both sides
- agree, the "clear input and reset counters" meaning for
- synch-data mark would have to be a mandatory part of the RCTE option.
- Second, since the Synch-data mark is a "one-way" function, there needs
- to be a way for one side of the connection to tell the other side to
- "send me a Synch-data mark". The New Telnet protocol spec implied that
- Abort Output could be used for that purpose; if hot, then perhaps a
- new function could be defined. Again, the RCTE option should make
- some explicit statement requiring (or very strongLy recommending)
- this interpretation of AO. For non-RCTE mode, it's a nice idea but
- probably not required. Ray has tentatively agreed- thinks it could
- work on Tenex (server side). I would like your comments and Doug
- Dodds' (Tenex user RCTE). I don't know of any other existing RCTE
- implementations that would have to change. I also don't know what it
-
- -1-
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- takes to extend official protocols these days, but maybe it's easier
- to do that than define a new option (ie reverse RCTE).
-
- Regards,
- Nancy
-
-
-
- 15-Jul-76 Doug Dodds (BBN-RCC)
-
- Nancy,
-
- Your suggestion for the RCTE-clear function being performed by the Au
- command (when RCTE is on) is a good one. I see no problem with it
- from the side of the Tenex User Telnet (NTELNET). At present NTELNET
- is ignoring AO (and some other commands) entirely; this is a good
- opportunity to implement it in general.
-
- Doug
-
-
-
-
- 21-Jul-76 Jon Postel (SRI-ARC)
-
- I met with Ray Tomlinson for a few minutes to discuss the RCTE-clear
- function and other RCTE features. We agreed that Nancy's suggestion
- for using the AO command for the clear function made sense. We also
- determined that the RCTE document should say something about the
- state some other options should be in when using RCTE. For example we
- believe that GO-AHEAD must be suppressed while RCTE is in use, that
- when one quits RCTE the ECHO mode must be restored to what it was at
- the time of entering RCTE,, and that BINARY and RCTE do not make sense
- as a combination because every byte would have to be assumed to be a
- break character. We also determined that it is unworkable to use
- RCTE and no break characters since there is no way to get out of that
- state.
-
- 22-Jul-76 Jon Postel (SRI-ARC)
-
- As a result of the above discussion I will prepare a revised RCTE
- specification document. A draft will be distributed to interested
- parties for comments and the final document will be published as an
- RFC.
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