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Message-ID: <20220401001531.GB9545@breakpoint.cc> Date: Fri, 1 Apr 2022 02:15:31 +0200 From: Florian Westphal <fw@...len.de> To: Eric Dumazet <edumazet@...gle.com> Cc: Jaco Kroon <jaco@....co.za>, Neal Cardwell <ncardwell@...gle.com>, LKML <linux-kernel@...r.kernel.org>, Netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com> Subject: Re: linux 5.17.1 disregarding ACK values resulting in stalled TCP connections Eric Dumazet <edumazet@...gle.com> wrote: > Next step would be to attempt removing _all_ firewalls, especially not > common setups like yours. > > conntrack had a bug preventing TFO deployment for a while, because > many boxes kept buggy kernel versions for years. > > 356d7d88e088687b6578ca64601b0a2c9d145296 netfilter: nf_conntrack: fix > tcp_in_window for Fast Open Jaco could also try with net.netfilter.nf_conntrack_tcp_be_liberal=1 and, if that helps, with liberal=0 and sysctl net.netfilter.nf_conntrack_log_invalid=6 (check dmesg/syslog/nflog).
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