1 This target allows to selectively work around broken/old applications. 2 It can only be used in the mangle table. 3 .TP 4 \fB\-\-checksum\-fill\fP 5 Compute and fill in the checksum in a packet that lacks a checksum. 6 This is particularly useful, if you need to work around old applications 7 such as dhcp clients, that do not work well with checksum offloads, 8 but don't want to disable checksum offload in your device. 9