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Title: Internet/RFCs/0101 - 0200 - RFC 0142 Time-Out Mechanism in the Host-Host Protocol. C. Kline, J. Wong. May 1971.
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RFC 142 (rfc142) - Time-Out Mechanism in the Host-Host Protocol@import 'http://faqs.org/abstracts/css/default.css';@import 'http://faqs.org/search.css';function erfc(s){document.write("[ RFC Index | RFC Search | Usenet FAQs | Web FAQs | Documents | Cities ]Alternate Formats: rfc142.txt | rfc142.txt.pdfRFC 142 - Time-Out Mechanism in the Host-Host ProtocolSearch the Archives  Display RFC by number RFC142 - Time-Out Mechanism in the Host-Host ProtocolNetwork Working Group Charley KlineRequest for Comments #142 Johnny WongNIC #6727 UCLA (NMC)Categories: C.1, C.2, C.3, C.5 3 May 71Updates: noneObsoletes: none Time-out Mechanism in the Host-Host ProtocolOn sending a message to a foreign site, the following situations canoccur:1. Destination IMP down - Type 7 message is returned2. Destination IMP up but destination IMP-HOST interface is down - Type 7 message is returned.3. Destination IMP and IMP-HOST interface up, but IMP-HOST inter- face is not taking messages - Type 9 message is returned after IMP time-out (ask BBN for time).4. Destination IMP and IMP-HOST interface up and IMP-HOST inter- face is taking messages - Type 5 (rfnm) message is returned.A suggestion for handling type 7 and type 9 messages has been made inNWG/RFC #117. In this document we would like to discuss in detail theproblem: what should happen to the HOST-HOST protocol on receiving arfnm?When a NCP sends out a STR or RTS control command on a pair of socketsand gets a rfnm back, this pair of sockets will be in a wait-matchstate. Everything is fine if a matching RTS or STR, or CLS isreturned after a reasonable amount of delay. Trouble will arise whennothing is returned after a long time.This can happen if the NCP is not running at all but its host istaking in messages (e.g. UCLA's host will receive messages even if theNCP is not running), or if the NCP is running very slowly. The sameproblem exists on sending out a CLS control command and a matching CLSis never returned. The trouble is that resources are tied up, e.g.sockets, links and table space in the NCP; and one would like torelease these resources. In our implementation, when a user does aCLOSE, we can't release the sockets until the matching CLS isreturned. This protects us from getting confused if a seconds requestis made for the same pair of sockets. This problem can be solved byincluding a time-out mechanism in the Host-Host protocol. Thisoperates as follows: [Page 1]ne 5a. On sending out a STR or RTS and if you do not get back a match- ing RTS or STR, or a CLS in T time units a CLS will be sent. After sending the time-out CLS race condition can be avoided by ignoring the matching RTS or STR that arrives before the matching CLS.b. On sending out a CLS (any kind, including the time-out CLS), and if you do not get back a matching CLS in T time units, the matching CLS is assumed to have returned. However, if a RTS or STR is sent on the same pair of sockets anytime after the time out and before a CLS is returned, and then we receive the CLS, there is no way to determine whether this returning CLS is for matching the previous CLS or for refusing the RTS or STR. (See the figure for detail). So far we could not solve this race condition except by assigning sequence number to connection throughout the Network which we don't think is a good solution at all. Hence, we would like to bring the attention of the Host-Host Protocol Glitch Cleaning Committe to this problem. The time limit T should be a Network Standard and its value should be decided also. Reason Our NCP ------ ------- 1. User requests connection 1. RTS -> 2. User gets tired requests CLS (or NCP timeout) 2. CLS -> 3. No matching CLS returned in T time units 3. CLS assumed returned free socket and other resources 4. User requests another connection over same socket pair 4. RTS -> 5. CLS received ?? does it belong to 2 or 4? Figure [ This RFC was put into machine readable form for entry ] [ into the online RFC archives by Gert Doering 4/97] Previous: RFC 0141 - Comments on RFC 114: A File Transfer Protocol Next: RFC 0143 - Regarding proffered official ICP [ RFC Index | RFC Search | Usenet FAQs | Web FAQs | Documents | Cities ] © 2008 FAQS.ORG. All rights reserved. |
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Time-Out | Mechanism | in | the | Host-Host | Protocol. | C. | Kline, | J. | Wong. | May | 1971. |
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Time-Out Mechanism in the Host-Host Protocol. C. Kline, J. Wong. May 1971.
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