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NWG/RFC 751                                          PDL 10 Dec 78 nnnnnNetwork Working Group                                   P. David LeblingRequest for Comments: 751                                  (PDL@MIT-DMS)NIC: nnnnn                                              10 December 1978SURVEY OF FTP MAIL AND MLFLTwo surveys of Arpanet Server hosts were run between September 20, 1978and December 11, 1978.  The intent was to determine the response of thehost's Server FTP program to:(a) An attempt to mail to an unknown recipient at that host.  Thepurpose of this survey was two-fold.  First, to determine whether thehost accepts mail for unknown recipients at all, and second, whatresponse the host gives if it does not accept such mail.(b) An attempt to mail to a known recipient using the MLFL commandrather than the usual MAIL command.  This survey was undertaken todetermine the extent of support for the MLFL command among Server hosts,and the sort of reply received if the Server does not support MLFL. MLFLis potentially a 'better' form of communication than mail as the messageis sent over a data connection rather than the command connection.Using the data connection eliminates the 'end-of-mail' marker and'command reader' problems sometimes encountered over the commandconnection.The ground rules of the survey were that all sites listed as Servers inthe MIT/SAIL Host table were surveyed.  In many cases, a host listed asa Server would not respond to an ICP at any time during the period ofthe survey.  Once a host responded with what seemed to me to be a'definitive' answer, I marked it as such and stopped surveying it.                              MLFL SurveyThe algorithm used was to ICP to socket 3 of the server (the standardold-FTP socket).  Once a 300 response was received, I sent the MLFLcommand.  Where I had the name of a real mailbox at a site (aHeader-person, for example) I used that, otherwise the name "**".  If asite asked for a password (response 504) after the MLFL command I gave"USER NETML" "PASS NETML" and retried the MLFL.  If the server repliedwith a 255 SOCK command, I listened for the data-connection to beestablished.  When it was, I transferred the mail file.  Interestinglyenough, most sites implement an RFC queueing algorithm that will allowthe user site to attempt to establish the data-connection from its end.                                                                [Page 1]

NWG/RFC 751                                          PDL 10 Dec 78 nnnnnSurvey of FTP MAIL and MLFLComplete FTP scripts may be found, if you are interested, on MIT-DM,file NETDOC;MLFL SURVEY.Sites are grouped by the general result they gave.-site-          -last ftp reply if lost-                -when-1) Sites that lost for various reasons:BNL             530 NOT LOGGED IN.                      after MLFLHARV-10         431 INVALID ENTRY - Try again           after USERLLL-MFE         454 Login please                        after SOCKLONDON          000 INDRA FTP Version 2.00  ...         after ICPNBS-10          454 Login please                        after SOCKWHARTON         454  DATA Connection error ...          after SOCKWPAFB-AFAL      454 Login please                        after SOCKNote: "when" describes the last action performed by the surveyer beforethe indicated anomalous response.   after ICP --         surveyer had done ICP to socket 3   after MLFL --        surveyer had sent MLFL command   after USER --        surveyer had sent USER NETML in response to                        "504 Login please"   after SOCK --        surveyer had attempted to connect to specified                        data socket2) Sites that don't support MLFL and say so:AFWL            501 ML<?>FL **CCA-SPEECH      501 ML<?>FL **EGLIN           501 ML<?>FL **LBL             506 Command not implemented.LONDON-VDH      500 Command unrecognizedUCLA-CCN        500 COMMAND UNRECOGNIZEDWPAFB           501 ML<?>FL **3) Sites that support MLFL (or at least go through all the rightmotions):AMES-67         MIT-AI          SRI-KLBBN-TENEX       MIT-DMS         SU-AIBBN-TENEXA      MIT-MC          SUMEX-AIMBBN-TENEXD      MIT-ML          UCLA-ATSBBN-TENEXE      MIT-XX          UCLA-SECURITYBBN-UNIX        NBS-UNIX        USC-ECLCCA-TENEX       OFFICE-1        USC-ISICMU-10A         PARC-MAXC       USC-ISIBCMU-10B         PARC-MAXC2      USC-ISIC                                                                [Page 2]

NWG/RFC 751                                          PDL 10 Dec 78 nnnnnSurvey of FTP MAIL and MLFLDEC-MARLBORO    RADC-TOPS20     USC-ISIEI4-TENEX        RAND-RCC        UTEXASILL-UNIX        RAND-UNIXLL              RUTGERSLL-ASG          SRI-KA4) Sites that support MLFL but require "USER NETML" "PASS NETML"(Multics):MIT-MULTICSRADC-MULTICS5) Others:a) Sites that might support it if I could mail to a real user (some ofthese run operating systems that are "known to work", e.g. TENEX):BBN-TENEXB      450 No such mailbox at this site.CCA-SDMS        450 User UnknownCCTC            451 User Not RecognizedCMU-10D         507  USER NOT FOUND: **DTI             451 User Not RecognizedLL-11           450 User UnknownLL-XN           450 User UnknownNCSC            451 User Not RecognizedNOSC-CC         451 User Not RecognizedNOSC-SDL        451 User Not RecognizedNTIA-ITS        451 User Not RecognizedOFFICE-2        450 No such mailbox at this site.RADC-XPER       451 User Not RecognizedSDAC-44         431 User name invalidSDAC-UNIX       451 User Not RecognizedSRI-UNIX        451 User Not Recognizedb) Sites that either never responded to an ICP to socket 3, or were notaccepting FTP users:ANL             I4B-TENEX       NOSC-SECURE1ARPA-DMS        ISI-SPEECH11    NSWC-WOCMU-CMMP        LBL-UNIX        NUSCCTO-DDS         LLL-COMP        NUSC-NPTDTNSRDC         MOFFET-ARC      NWCFNWC            NADC            NYUGUNTER-UNIX     NDRE            PENT-UNIX                                                                [Page 3]

NWG/RFC 751                                          PDL 10 Dec 78 nnnnnSurvey of FTP MAIL and MLFL                              MAIL SurveyThe mechanics of the MAIL survey were similar to those of the MLFLsurvey.  The command was "MAIL Fzorkness" (an account unlikely to existon any host).  The responses are grouped into a few general categories.Complete FTP results may be found on MIT-DM, file NETDOC;MAIL SURVEY.-site-          -last response-1) Sites that lost completely.LONDON          000 INDRA FTP Version <>.00  ...2) Sites that accept mail to an unknown recipient.BNL             MIT-ML          USC-ISIMIT-AI          RAND-RCC        USC-ISIBMIT-DMS         UCLA-CCN        USC-ISICMIT-MC          USC-ECL         USC-ISIE3) Sites that refuse mail to an unknown recipient (grouped by response).SDAC-44         431 User name invalidBBN-TENEX       450 No such mailbox at this site.BBN-TENEXA      450 No such mailbox at this site.BBN-TENEXB      450 No such mailbox at this site.BBN-TENEXD      450 No such mailbox at this site.BBN-TENEXE      450 No such mailbox at this site.BBN-UNIX        450 User UnknownCCA-SDMS        450 User UnknownCCTC            451 User UnknownEDN-UNIX        450 User UnknownI4-TENEX        450 No such mailbox at this site.ILL-UNIX        450 User unknownLL              450 No such mailbox at LLLL-ASG          450 User unknownLL-XN           450 User unknownMIT-MULTICS     450  Cannot locate mailbox for \Fzorkness\MIT-XX          450 No such mailbox at this site.NBS-UNIX        450 User UnknownNCSC            450 User UnknownNOSC-CC         450 User UnknownNOSC-SDL        450 User UnknownNTIA-ITS        450 User UnknownOFFICE-1        450 No such mailbox at this site.OFFICE-2        450 No such mailbox at this site.PARC-MAXC       450 No such mailbox at this site.                                                                [Page 4]

NWG/RFC 751                                          PDL 10 Dec 78 nnnnnSurvey of FTP MAIL and MLFLPARC-MAXC2      450 No such mailbox at this site.RADC-XPER       450 User UnknownRADC-MULTICS    450  Cannot locate mailbox for \Fzorkness\RADC-TOPS20     450 No such mailbox at this site.RAND-UNIX       450 User UnknownRUTGERS         450 No such mailbox at this site.SDAC-UNIX       450 User UnknownSRI-KA          450 No such mailbox at this site.SRI-KL          450 No such mailbox at this site.SU-AI           450 I don't know anybody named FzorknessSUMEX-AIM       450 No such mailbox at this site.UCLA-ATS        450 User UnknownUCLA-SECURITY   450 User UnknownUTEXAS          450 User UnknownCCA-TENEX       451 No such mailbox at this site.AFWL            501 MA<?>IL FzorknessCCA-SPEECH      501 MA<?>IL FzorknessEGLIN           501 MA<?>IL FzorknessWPAFB           501 MA<?>IL FzorknessAMES-67         503 COMMAND \MAIL FZORKNESS\ IGNORED: UNKNOWN USERLBL             506 Command not implemented.CMU-10A         507 % USER NOT FOUND: FZORKNESSCMU-10B         507 % USER NOT FOUND: FZORKNESSCMU-10D         507 % USER NOT FOUND: FZORKNESSHARV-10         507  No such user as FZORKNESSLLL-MFE         507  No such user as FZORKNESSNBS-10          507  No such user as FZORKNESSWHARTON         507  No such user as FZORKNWPAFB-AFAL      507  No such user as FZORKNESS4) Sites to which I was never able to connect, or which were notaccepting users.ANL             I4B-TENEX       NOSC-SECURE1ARPA-DMS        ISI-SPEECH11    NSWC-WOCMU-CMMP        LBL-UNIX        NUSCCTO-DDS         LL-11           NUSC-NPTDEC-MARLBORO    LLL-COMP        NWCDTI             LONDON-VDH      NYUDTNSRDC         MOFFETT-ARC     SRI-UNIXFNWC            NADC            SU-ISLGUNTER-UNIX     NDRE                                                                [Page 5]