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Re: tsv-dir review of draft-ietf-behave-ftp64-10

2011-06-06 04:44:53
Thanks everyone for the comments. I'll look into the other technical comments 
later this week, but there's one I can respond to right now:


On 4 jun 2011, at 0:16, Fernando Gont wrote:

* Section 1, page 3:
  In 5 cases, issuing the EPSV
  command to the server led to a significant delay, in 3 cases followed
  by a control channel reset.

Could you please clarify what was the cause of the delay?

These tests were towards FTP servers found around the internet, so we were 
unable to determine what exactly those servers were doing, other than what we 
observed remotely.

We speculate that this is the result of a firewall placed in front of the FTP 
server that monitors the control channel and opens ports based on the PASV or 
PORT commands, but the firewall doesn't support EPSV so no port is opened and 
the data channel can never be established.

I can put this discussion in the draft. (I seem to remember it was in an 
earlier version.)
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