Re: Another problem with usage charges

Ross Patterson (A024012%RUTVM1.BITNET@CUNYVM.CUNY.EDU)
Mon, 02 May 88 10:57:16 EDT

>Well -- if you read the spec, FTP itself implements checkpoint/restart.
>Better protocols may be desirable, but for now we should make the most
>of the ones we already have.
>Has anyone implemented checkpoint/restart in FTP?

    Yup. The UCLA TCP/IP for IBM's MVS system, known as the "ARPANET
Control Program", or ACP, supports FTP checkpoint/restart. The Unixes
we've got around here dont, since they won't accept a "MODE B" command
(Sun's responds "Sorry, only stream mode supported" (or something
close to that)). ACP is the basis for most, if not all, IBM MVS
implementations. It supports restarting of both transmission and
reception, as well as allowing the user control over the interval
between checkpoints (defaulting to 100K bytes).

    Are there any other checkpointers out there?

Ross Patterson
Rutgers University

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