<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">Hi,</p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">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).</p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">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.</p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">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" - <a style="color: inherit;" href="http://tools.ietf.org/html/draft-ietf-dhc-fqdn-option-13#section-3.2%29" target="_blank">http://tools.ietf.org/html/draft-ietf-dhc-fqdn-option-13#section-3.2)</a></p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">dnsmasq version is 2.46</p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">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. </p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">All domain-names are same, in dnsmasq options (domain-name) and win clients.</p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">Is there option to force dhcp server not to override client's preference in DHCP option 81 - FQDN?</p>
<p style="font-family: Tahoma,sans-serif; font-size: 13px; color: black;">I try options like dhcp-option=81,0 and other variants, but with no sucsess.</p>
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