tftp serious trouble

[John Goerzen <jgoerzen@complete.org>]

Hi,

There seem to be a number of problems with tftp.  We have some X
terminals that boot by tftp and then fetch some config files using tftp.

First, it seems to fire off huge numbers of server processes.  When we 
had only 8 terminals booting at once, inetd throttled the tftp server
for receiving too many connections (something like 40 in a minute).
This shouldn't happen with only 8 terminals.  So I went in and
increased the limit to 200, which seemed to make it happy for the
moment.

Then I noticed that some terminals were not being served -- they would 
apparently hang, waiting for the server.  There are some mysterious
"read: Connection refused" entries in the log file.  I have no idea
why one could get a Connection refused on a read.  These messages are
logged by tftpd.

Finally, there are large numbers of the tftpd processes left laying
around.  I don't know how they get there.  gdb shows nothing useful
other than that they are stuck in a recv of some sort.

Any ideas??

-- 
John Goerzen                              Southwind Internet Access, Inc.
E-mail: Business, jgoerzen@southwind.net; Personal, jgoerzen@complete.org
Computer Science Dept., Wichita State University,    jgoerzen@cs.twsu.edu
Developer, Debian GNU/Linux                       <http://www.debian.org>


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