Question : Gigabit LAN with Jumbo Frame

Hi there,
  I have set up 2 pc (Netgear GA622T NIC) with a gigabit switch(Jumbo Frame enabled,MTU 9014) recently. On the network card, I have set the packet size to 9014(Alteon).

When i try to download a file using FTP, the speed was extremely slow. however, the uploading speed was fine. When i lower the packet size to 4088, the speed for the upload and download was ok.

Why is it that I cna do upload without problem but for download, it was extremely slow(29kbps).

And what does "alteon" mean?

Thanks

Answer : Gigabit LAN with Jumbo Frame

Anything that says "FTP-DATA" is the "upload" part.  That is the data connection for the ftp session and that is where the data is being transfered.

It almost seems like something is telling TCP to write 12K at a time and IP is breaking this down into 8K and 4K packets.

What FTP server software are you using?

Which NIC is on the FTP server side?  

Do you know if the NIC on the server side happens to support TOE (TCP Offload Engine)?