DHCPINFORM / DHCPACK filling up syslog

[essdeeay]

Hello,

dhcpd: isc-dhcpd-V3.0.1
clients: Windows XP Pro SP2

I have the default lease time set to 7 days. However, I'm seeing DHCPINFORM messages for each client every few hours. I would only expect to see one after 3.5 days.

Does anyone know why this is and/or how I can stop it?

Many thanks,
Steve

[ecalpasiereht]

This is a windows client problem. As microsoft explains: "currently, Windows 2000 and Microsoft Windows XP clients send a DHCPInform packet to obtain additional DHCP scope settings for DHCP options 06, 15, and 44"
06 is DNS Server,
15 is Domain Name
44 is the WINS Server.
The windows XP client is trying to get this data from the DHCP server, so you can reconfigure your dhcpd to provide this information.

[essdeeay]

Hi again,

Thanks for your reply - I tried setting these options but it hasn't made any difference. I don't have (not want) a WINS server with only half a dozen clients on the network, so have specified the node type to be broadcast only, hopefully negating the need for the netbios-name-servers option. I even put a phoney server address in, just so the client would at least take it, but as I said, these options haven't stopped the DHCPINFORM/DHCPACK messages in syslog. See below for a sanitized sample of my dhcpd.conf.

I can't work out how to enable a particular logging level to be able to see what exactly the clients are requesting. Is it possible?

Many thanks,
Steve

authoritative;
option domain-name	"mydomain.com";
ddns-update-style	none;
default-lease-time	604800; # 7 days
max-lease-time		604800; # 7 days

subnet 192.168.0.0 netmask 255.255.255.0 {

        option subnet-mask		255.255.255.0;
        option routers			192.168.0.1;
        option domain-name-servers	192.168.0.1;
        option netbios-node-type	1;

        host fred {
                hardware ethernet 00:0D:7A:09:09:60;
                fixed-address 192.168.0.3;
        }
}

[ecalpasiereht]

Sorry for the long delay. Did you manage to resolve the problem ?
If not, can you provide the result of 'ipconfig /all' from one of your WinXP clients ?

There is one setting I think you can do: primary DNS suffix (right click My Computer, go to Computer Name, then "Change", "More...", and fill the "primary DNS suffix of the this computer" line with smth like mydomain.com.