using nsupdate with monowall

is it possible to use the nsupdate command with monowall, to update the 
DNS server?

When I try, I get a NOTIMP error.  I'm running monowall 1.33.

To explain, I create a file:

[me@host ~]cat > foo << EOF
server 192.168.15.254
zone mydomain.com
update add centos64e.mydomain.com 86400 A 192.168.77.162
send
EOF

[me@host ~]$ cat foo | nsupdate
update failed:  NOTIMP

Thanks,

Jeremy