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Date:   Sat, 2 Apr 2022 16:14:10 +0200
From:   Florian Westphal <>
To:     Jaco Kroon <>
Cc:     Neal Cardwell <>,
        Florian Westphal <>,
        Eric Dumazet <>,
        LKML <>,
        Netdev <>,
        Yuchung Cheng <>, Wei Wang <>
Subject: Re: linux 5.17.1 disregarding ACK values resulting in stalled TCP

Jaco Kroon <> wrote:
> Including sysctl net.netfilter.nf_conntrack_log_invalid=6- which
> generates lots of logs, something specific I should be looking for?  I
> suspect these relate:
> [Sat Apr  2 10:31:53 2022] nf_ct_proto_6: SEQ is over the upper bound
> (over the window of the receiver) IN= OUT=bond0
> SRC=2c0f:f720:0000:0003:d6ae:52ff:feb8:f27b
> DST=2a00:1450:400c:0c08:0000:0000:0000:001a LEN=2928 TC=0 HOPLIMIT=64
> FLOWLBL=867133 PROTO=TCP SPT=48920 DPT=25 SEQ=2689938314 ACK=4200412020
> WINDOW=447 RES=0x00 ACK PSH URGP=0 OPT (0101080A2F36C1C120EDFB91) UID=8
> GID=12

I thought this had "liberal mode" enabled for tcp conntrack?
The above implies its off.

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