From mboxrd@z Thu Jan  1 00:00:00 1970
From: "U.Mutlu" <for-gmane@mutluit.com>
Subject: Re: IPTABLES + PREROUTING + --set-mark + Ubuntu
Date: Fri, 16 Jan 2015 03:14:18 +0100
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> Looks like it doesn't want to mark anything on the PREROUTING /
> INPUT phase.. or an option somewhere is not enabled..

A hint:
I think you have to send packets from another host to this host
to let the pkts go thru the PREROUTING chain of the mangle table.