Can not apply iplimit.patch?

[auther_bin]

Dear firends:

        When I setup iptables-1.2.6a by patching iplimit.patch on kernel-2.4.18, It's 
can't work!

And it tells me: Hunk #1 FAILED at 1.
1 out of 1 hunk failed........

        Looked like the patch can not work under 2.4.18 at all, How can I make this 
patch applied? I want to prevent the SYN flood bye using this limit rules.