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[2a10:fc81:a806:d6a9::1]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48448e13db0sm772667f8f.0.2026.09.01.11.15.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Sep 2026 11:15:34 -0700 (PDT) From: Stefano Brivio To: Hayato Kiwata Subject: Re: [PATCH] netlink: Don't warn about multiple interfaces when there's only one Message-ID: <20260901201533.2c69b123@elisabeth> In-Reply-To: <20260822084856.3981-1-dev@haytok.jp> References: <20260822084856.3981-1-dev@haytok.jp> Organization: Red Hat X-Mailer: Claws Mail 4.2.0 (GTK 3.24.49; x86_64-pc-linux-gnu) MIME-Version: 1.0 Date: Tue, 01 Sep 2026 20:15:34 +0200 (CEST) X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: iZYS_65Izl_GEnQ3elUsCOJRH8oG5wICcC1nEanpafY_1788286536 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Message-ID-Hash: 4G5GA3GER4PPFXHWJFY7XEMMTANNN6GU X-Message-ID-Hash: 4G5GA3GER4PPFXHWJFY7XEMMTANNN6GU 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 CC: passt-dev@passt.top 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 Sat, 22 Aug 2026 17:48:56 +0900 Hayato Kiwata wrote: > Suppose there is a single network interface on the host, with two > addresses of different prefixes assigned to it. > > In this situation, running pasta to create an isolated netns prints > "Multiple interfaces with %s routes, picked first", even though there > is in fact only one candidate interface. > > Reproducer: > > sudo ip link add dummy42 type dummy > sudo ip link set dev dummy42 up > sudo ip addr add fdaa:aaaa:aaaa::1/64 dev dummy42 > sudo ip addr add fdbb:bbbb:bbbb::1/64 dev dummy42 > > pasta --config-net -- true > > This message is meant to indicate that there are multiple candidate > interfaces, but in fact there is only one, which can mislead users. > > Therefore, avoid printing this message when there are multiple non-default > routes that all belong to the same interface. > > Fixes: 450a6131beab ("netlink: With no default route, pick the first interface with a route") > Signed-off-by: Hayato Kiwata Applied, thanks, and sorry for the delay! -- Stefano