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Re: bin/56129 (ftp(1) should keep control session duringlargexfer)

The following reply was made to PR bin/56129; it has been noted by GNATS.

From: RVP <rvp%SDF.ORG@localhost>
To: Izumi Tsutsui <>
Subject: Re: bin/56129 (ftp(1) should keep control session duringlargexfer)
Date: Wed, 23 Jun 2021 20:31:39 +0000 (UTC)

 On Thu, 24 Jun 2021, Izumi Tsutsui wrote:
 > The similar timeout occured 6minsq or 8 mins so there might be
 > more conditions, but anyway I'll try reproduce on slower machines
 > or large files.
 Hmm, now I wonder if you have the same problem that I have: an
 overly aggressive FTP NAT timeout (my timeouts are pretty consistent:
 ~30 mins).  Can you do a tcpdump of port 21?
 In any case, ftp(1) will have to be modified to either:
 a) send periodic keepalive commands during long xfers, or
 b) for non-nteractive xfers, re-connect and fetch the rest of the
     files in a list. (Most of the code for this is already there;
     just needs a bit of re-arrangement.)

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