rquotad is an rpc(3N) server which returns quotas for a user of a local file system which is mounted by a remote machine over the NFS. The results are used by quota(1) to display user quotas for remote file systems.
The rquotad daemon is normally started at boottime from the rc.net script (on systems with BSD'ish scripts, e.g. Slackware), or from the nfs script in /etc/rc.d/init.d/ or /etc/init.d/ (on systems with SysV'ish scripts, e.g. RedHat, SuSE, etc).
mountd: .bar.com
You have to use the daemon name rquotad for the daemon name (even if the binary has a different name). For the client names you can only use the keyword ALL or IP addresses (NOT host or domain names).
For further information please have a look at the tcpd(8), hosts_allow(5) and hosts_access(5) manual pages.