Tu znajdziesz łatki do programu udhcp (Small DHCP client and server).
http://udhcp.busybox.net/

łatka: udhcp-script-fix.diff

fix sample action script (it's installed as default.* instead of sample.*)

łatka: udhcpd-ignoreservers.diff

Add -I switch to udhcpc: ignore specified servers.
Add -N switch to udhcpc: ignore DHCPNAK's.