User-class and DHCPINFORM
DELFAIRIERE Thomas
thomas.delfairiere at siih5962.fr
Thu Oct 15 14:16:57 UTC 2009
Hello,
I've got XP workstations and DHCP servers configured with a user class like this
class "PCs_User_Class_Chrul" {
match if (option user-class = "mycompany");
option domain-name "mycompany.net";
}
In default network, the default domain-name option is "yyyy.com".
Some workstations with good settings (user class "mycompany" in the paramaters of the network interface) don't have the good domain-name (they have yyyy.com instead of mycompany.net).
I realize a sniff :
- when a workstation (with the user-class "mycompany") send DHCPREQUEST or DHCPDISCOVER, the dhcp server respond with the good domain-name "mycompany.net".
- when the same workstation send DHCPINFORM, the dhcp server respond with the default domain-name "yyyy.com".
The rfc 2131 (4.3.1) explains that the user-class is interpreted by dhcp server when receiving DHCPREQUEST or DHCPDISCOVER. Why the client send DHCPINFORM and DHCP server responds without interpreting the user class?
Is there a way to force the DHCP server to interpret the user class in the DHCPINFORM message?
Thanks for your ansvers
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