Ah.

Well on OSX that should be done with sysctl, which should be fairly analogous to the old FreeBSD sysctl. There are less values than Linux but you can set these at least: 
net.inet.tcp.sendspace: 32768                                         
+                           
net.inet.tcp.recvspace: 57344                                         
+                           
net.inet.tcp.path_mtu_discovery: 1

[download]

You should be able to use (as root) this form 
sysctl -w net.inet.tcp.recvspace=40960

[download]

or in /etc/sysctl.conf set the value with this form 
net.inet.tcp.recvspace=40960

[download]
so any values are maintained across reboots.

So I suspect the thing to look for is your default send window being too large. If that was the case the delay could be caused by excessive packet reassembly problems, with more hops to the NT probably making it worse. I would also look on the NT box at the firewall logs when you connect .. PS I don't know how close those commands are but it should get you close..

In reply to Re^3: Net::FTP takes a very long time in Passive mode by hsinclai
in thread Net::FTP takes a very long time in Passive mode by Cody Pendant

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