Problems with iptables in ubuntu 12.04 LTS Server

[chunny74]

I have to add the following line to iptables.

iptables -A jk2_ddos -m u32 ! --u32 "0x1c=0xffffffff" -j ACCEPT

I get this error message:

iptables v1.4.12: u32: option "--u32" cannot be inverted.

How can I fix this. I'am a total noob, please help.

Thanks,
Oliver

[SeijiSensei]

What exactly are you trying to do? Perhaps there's a simpler way to write this rule.