Can't see how - one example of a client is /etc/dhcp/dhclient-eth0.conf: send vendor-class-identifier "anaconda-Linux 2.6.32-71.el6.x86_64 x86_64";
and what's in /etc/dhcp/dhclient.d is -rwxr-xr-x. 1 root root 3221 Nov 11 2010 nis.sh -rwxr-xr-x. 1 root root 1944 May 20 2009 ntp.sh
What kind of configuration were you thinking of that could be wrong?
Well, something that requests a "bootfile-name" from the dhcp server. That's not a valid option for ISC dhcpd, but could be for other implementations.