slow connection within the LAN

[gatesession]

Hi, got a question ... I have an ftp server (vsftpd running). Public & for users.
Outside my LAN it works out nicely. Fast and how it should be.
Problem occurs within the LAN. It goes like 4kb/s.
NFS works fine as well, file transfer goes very fast as it should be.
Have a problem ftp:ing between the computers on the LAN.

Appriciate for help.

Thanx in advance, hope its a right place for the thread.

[JordanN]

Do you have a defective switch or bad wiring? A bad switch can cripple your network.

[gatesession]

Everything goes via broadband router (NEtgear)
I maybe can chewck the routersettings but NFS filetransfers goes fast so I do not know if that might be the problem.
So, my LAN is connected to one single broadband router.
Then via router out on the WAN: