From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: [PATCH 1/5] Add support for NAT sequence adjustments
Date: Sun, 09 Dec 2007 20:09:34 +0100
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Cc: Netfilter Development Mailinglist
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To: Pablo Neira Ayuso <pablo@netfilter.org>
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Pablo Neira Ayuso wrote:
> The combination of NAT and helpers may produce TCP sequence adjustments.
> In failover setups, this information needs to be replicated in order to
> achieve a successful recovery of mangled, related connections. This
> patch is particularly useful for conntrackd, see:
>
>   
+	/* NAT sequence adjustment */
+	IPCT_NATSEQADJ_BIT = 13,
+	IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),

You don't seem to be using this bit for anything.