A good server is tftp-hpa, which can be installed from the tftp-hpa package in Debian and Ubuntu:
sudo apt-get install tftp-hpa
There’s also an rpm by the same name for RHEL.
The TFTP server will only allow existing files to be written:
cd /var/lib/tftpboot touch netgear.conf chmod a+w netgear.conf
From within the switch’s web interface, go to Maintenace:Upload, select “Text Configuration”, TFTP, IPv4, and enter the IP address of the tftp server. Set the path to blank, and the filename to “netgear.conf”. Check “Start File Transfer” and click the Apply button. If it’s successful, you’ll see /var/lib/tftpboot/netgear.conf now contains your configuration information.
(That interface is a mess!)