register DNS entry with dhclient

[Zhang Weiwu]

I have a ADSL modem (domain name: modem.lan) also acting as DNS/dhcp server 
(pretty smart toy). The Windows computers in the office, after boot up and 
requested an ip addresss, also registere a DNS name in the modem 
(netbiosname.lan), but FreeBSD and Linux computers don't register their DNS 
name. So everyday we keep asking "Jerry what's your ip address I need to 
scp a file ..." :(

I thought it won't be difficult to let FreeBSD register domain name. after 
read the specific part of dhclient.conf(5), I created a /etc/dhclient.conf 
file:
------
#my hostname is thinkpad.lan, 'lan' is our default search domain
send fqdn.fqdn "thinkpad.lan";
send fqdn.server-update on;
------
Still my thinkpad runing FreeBSD 5.2 don't seem to have registered:
zhangweiwu at thinkpad:~>nslookup windowsbox.lan
Server:  modem.lan
Address:  10.0.0.138
 
Non-authoritative answer:
Name:    windowsbox.lan
Address:  10.0.0.6

zhangweiwu at thinkpad:~>nslookup thinkpad.lan
Server:  modem.lan
Address:  10.0.0.138
 
*** modem.lan can't find thinkpad: Non-existent host/domain

I am not sure of the mechnism in domain name registeration; I cannot debug 
it. Is there any obvious wrong operation I am taking?

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