[CentOS] Iptables Rpm Missing Modules

The current build of iptables does not appear to include some  modules. Among these are 
ipt_recent.so, a very handy module in  deflecting the current flurry of sshd dictionary 
attacks. Lineox  appears to have the same problem. 

This is because the RedHat source rpm spec file is not  explicit in the kernel directory 
location and that omission affects these few modules. Required changes in the spec file 
are in bold and italics  (everywhere there is a /usr just replace it by /usr/src/linux-2.4): 

make COPT_FLAGS="$OPT" KERNEL_DIR=/usr/src/linux-2.4  LIBDIR=/%{_lib} 
make COPT_FLAGS="$OPT" KERNEL_DIR=/usr/src/linux-2.4  LIBDIR=/%{_lib} iptables-
save iptables-restore 
make COPT_FLAGS="$OPT" KERNEL_DIR=/usr/src/linux-2.4  LIBDIR=/%{_lib} 
ip6tables-save ip6tables-restore 
make install DESTDIR=%{buildroot} KERNEL_DIR=/usr/src/linux- 2.4 BINDIR=/sbin 
LIBDIR=/%{_lib} MANDIR=%{_mandir} 
 %if %{build_devel} 
make install-devel DESTDIR=%{buildroot}  KERNEL_DIR=/usr/src/linux-2.4 
BINDIR=/sbin LIBDIR=%{_libdir}  MANDIR=%{_mandir} 

To fix this yourself, first download the iptables source rpm, install it, modify the spec 
(/usr/src/redhat/SPECS/iptables.spec) and run 
rpmbuild -ba /usr/src/redhat/SPECS/iptables.spec . It runs quickly and  produces an rpm 
which contains all of the  missing modules.