diff -Naur initscripts-0.7.0.3/busybox/conf.d/network initscripts-0.7.0.3-active-directoy-dns-update/busybox/conf.d/network
--- initscripts-0.7.0.3/busybox/conf.d/network	2011-07-01 18:58:34.000000000 +0200
+++ initscripts-0.7.0.3-active-directoy-dns-update/busybox/conf.d/network	2015-07-16 16:08:32.656155926 +0200
@@ -1,5 +1,5 @@
 DEFAULT_DHCP_PROG="/sbin/udhcpc"
 # -i must be the last argument!
-DEFAULT_DHCP_START="-T10 -t3 -n -i"
+DEFAULT_DHCP_START="-T10 -t3 -n -x hostname:$(hostname) -i"
 DEFAULT_DHCP_STOP=""
 DEFAULT_NETMASK="255.255.255.0"