[Dnsmasq-discuss] DHCP option 81 FQDN

glesov at mail.bg glesov at mail.bg
Sun Nov 20 21:30:40 GMT 2011




Hi, 


I have trouble with DHCP option 81 - FQDN. I want to use dnsmasq as DHCP
server, but I want Windows XP client to update MS DNS server (AD
integrated). 


Win Xp clients in DHCP:Request send option 81, with flags 0000-0-0-0-0
(MBZ-N-E-O-S), i.e. client will be responsable for DDNS update. 


But in response (ACK) from DHCP server, these settings is overriden - flag
is 0000-0-0-1-1 - flag O is 1 - server has overriden client's preference
for bit S, and bitS is 1 ("If the "S" is 1, the DHCP client SHOULD NOT
initiate an update for the name in the server's returned Client FQDN option
Domain Name field" -
http://tools.ietf.org/html/draft-ietf-dhc-fqdn-option-13#section-3.2) [1]



dnsmasq version is 2.46 


I have another router in another site with version 2.2x(i dont know), and
there server's option in ACKreply are 0-0-0-1 - only bit S is 1 - may be
incorrect combibnation, but clients update their DNS.  


All domain-names are same, in dnsmasq options (domain-name) and win
clients. 


Is there option to force dhcp server not to override client's preference in
DHCP option 81 - FQDN? 


I try options like dhcp-option=81,0 and other variants, but with no
sucsess. 




Links:
------
[1]
http://tools.ietf.org/html/draft-ietf-dhc-fqdn-option-13#section-3.2%29


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