ftp receive problems 1.3.75

Bob Felderman (feldy@myri.com)
Sat, 16 Mar 96 14:16:55 PST


I'm having trouble with ftp receive with 1.3.75 (and 74..71).
Using regular ethernet there doesn't seem to be a problem, but
when I use a network with a larger MTU, things hang. I'm suspecting
tcp or maybe skb stuff. I am able to telnet and cat files
in a while loop between the same two machines
freja: rsh pandora-t
(on pandora) rsh freja-t
(on freja) while 1 ; cat * ; end

I have tried shrinking my MTU size to 1500, but that doesn't seem to help.
When I shrunk the MTU size I did NOT shrink the size of the sock_buffs
I was allocating. That was left at approximately 8500bytes. I'll next try
to shrink the MTU and the buffer allocation size.

In case it helps, I've included a uuencoded, gzipped tarfile
with 3 files


ftp_recv-1.3.75 tcp dump trace for linux-1.3.75 receiver (pentium)
ftp_send-SunOS4.1.3 tcp dump trace for sunOS ftp sender
ftp_script script of the ftp commands

Let me know if there is anything else I can look at.

I've seen some postings about the irc loopback problems being related
to the MTU being larger than the socket buffers. Perhaps I'm
tickling that problem?

begin 666 ftp.tar.gz
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end