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[176.103.220.4]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-40fc5603356sm24590186f8f.30.2025.09.30.13.58.45 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Sep 2025 13:58:45 -0700 (PDT) Date: Tue, 30 Sep 2025 22:58:43 +0200 From: Stefano Brivio To: passt-dev@passt.top Subject: Re: [PATCH RFT] tcp: Fix ACK sequence on FIN to tap, handle retransmission in half-closed state Message-ID: <20250930225843.4cdc21f0@elisabeth> In-Reply-To: <20250930205132.885225-1-sbrivio@redhat.com> References: <20250930205132.885225-1-sbrivio@redhat.com> Organization: Red Hat X-Mailer: Claws Mail 4.2.0 (GTK 3.24.49; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: q1CQXMO3dNqluavYjeuExK5PqryLkyELQCuAVC81o8I_1759265927 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Message-ID-Hash: O6TRBRKITGLA5C25VFRFQSWXDWBA6UAF X-Message-ID-Hash: O6TRBRKITGLA5C25VFRFQSWXDWBA6UAF X-MailFrom: sbrivio@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Tue, 30 Sep 2025 22:51:32 +0200 Stefano Brivio wrote: > However, we don't necessarily call tcp_update_seqack_wnd() before > sending the FIN segment, which might lead to this exchange, where > 192.168.10.102 is a HTTP server in a Podman container, and > 192.168.10.44 is a client fetching approximately 160 KB of data ...sorry, this is actually 121 KB. -- Stefano