Here is the domain.cf that NIT will be using:
set-name=default server-address=188.8.131.52 server-name=ftp.nit.edu server-type=all-users #max-domain-users= ftp-home=/home/ftp passwd=/etc/passwd log-xfer=/var/log/ncftpd/xfer.%y%m%d log-session=/var/log/ncftpd/sess.%y%m%d a-login-message=/home/ftp/etc/motd u-login-message=/etc/motd #welcome-message=This is a simple one domain setup. They used "default" as the set-name, and the address of their ethernet interface as the server-address. Because they are only using one domain set, the value they used for server-address isn't very important, since all FTP connections will automatically use this set as the default. They did decide to set server-name to ftp.nit.edu, because they didn't want to use the hostname that corresponded with 184.108.40.206, cs.nit.edu.
NIT also is allowing both user access as well as anonymous FTP access, to the /home/ftp hierarchy, so they used "all-users" for the domain's server-type. NIT is also using the regular /etc/passwd for user authentication because they have no need for virtual users or alternate password databases.