mountd, DNS

[Pieter Donche]

Installed FreeBSD-amd64 and asked to set up NFS server and client during 
sysinstall.

In the boot process, at 'mountd' it takes some time, then:
Jan 12 14:36:10 macos mountd[686]: can't get address info for host hmacs.cmi.ua
.ac.be
Jan 12 14:36:10 macos mountd[686]: bad host hmacs.cmi.ua.ac.be, skipping
Jan 12 14:36:10 macos mountd[686]: bad exports lists line /home  hmacs.cmi.ua.a
c.be

When adding a line 143.129.75.10 hmacs.cmi.ua.ac.be in /etc/hosts 
(via vi) this messages disappears. I can use NFS.

But why is this needed?
I can use DNS names for any other host (ssh-ing to them works..)
so why not for this at boot time ? of is this normal?