Kernel Option : IP: always defragment

Hi, I want to activate the Option "IP:always defragment" in mein Kernel-Konfiguration to make my Firewall more secure but I didnt find this OPtion in menuconfig or in the file .config Is this Option in a SuSE7 Kernel active or not ? Or where can I activate it ? Or how can I force the kernel to reassemble IP-Fragments before Forwarding ? Thanx Daniel Golesny