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I'm trying to install ulogd tool in my system. ulogd requires nfnetlink_conntrack subsystem in the kernel. It seems nfnetlink_conntrack is not available in the Linux version(RHEL5) that I'm using. How to get that in my system? I can not find any info on this in Google, other than I get a bunch of results that give a link to the source code.

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Actually I found the solution. ulogd works with old kernels also. Only problem is my system was not supporting AF_UNSPEC address family. ulogd tried to use that, and it was failing. I changed the address family from AF_UNSPEC to AF_INET, and it worked!. –  Goms Aug 3 '12 at 0:26
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1 Answer

Recompile your kernel to enable it:

--- Networking support          
      Networking options  --->  
          [*] Network packet filtering framework (Netfilter)  --->
              Core Netfilter Configuration  --->
                  <*>   Connection tracking netlink interface
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