From owner-freebsd-net@freebsd.org Wed Mar 6 12:37:59 2019 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6075B1513960 for ; Wed, 6 Mar 2019 12:37:59 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from forward105p.mail.yandex.net (forward105p.mail.yandex.net [IPv6:2a02:6b8:0:1472:2741:0:8b7:108]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 61FF08BAFD for ; Wed, 6 Mar 2019 12:37:57 +0000 (UTC) (envelope-from bu7cher@yandex.ru) Received: from mxback14o.mail.yandex.net (mxback14o.mail.yandex.net [IPv6:2a02:6b8:0:1a2d::65]) by forward105p.mail.yandex.net (Yandex) with ESMTP id B674F4D42124; Wed, 6 Mar 2019 15:37:45 +0300 (MSK) Received: from smtp3p.mail.yandex.net (smtp3p.mail.yandex.net [2a02:6b8:0:1472:2741:0:8b6:8]) by mxback14o.mail.yandex.net (nwsmtp/Yandex) with ESMTP id XvymO3Qbo7-bjtCRDkU; Wed, 06 Mar 2019 15:37:45 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1551875865; bh=Y5Z+d5fS24MsTPUWWWmLeuGS5YQf5mo+lPACerfpN8g=; h=In-Reply-To:From:Date:References:To:Subject:Message-ID; b=s7nrC6y4ZhQNUrWdOeBfOPY2mq7pgyouobfWppnTIClN8nRGciSDDoCQLlXbcZnTC mQ2hFFUxXe42JYzBfurEK/qZIG4TE51dFhiy6QGuq4mrZ2QouljtLT+3BcnIHjfeD8 vnsmpdwp+hGS1qhhb/gdCtNDnd/TFvZM37ZHDIOg= Received: by smtp3p.mail.yandex.net (nwsmtp/Yandex) with ESMTPSA id t1D0yjWuqg-bipqmqYb; Wed, 06 Mar 2019 15:37:44 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) Subject: Re: UDP broadcast To: =?UTF-8?Q?Goran_Meki=c4=87?= , freebsd-net@freebsd.org References: <20190305224610.frw5ov5bn6f3xaqg@hal9000.home.meka.rs> From: "Andrey V. Elsukov" Openpgp: id=E6591E1B41DA1516F0C9BC0001C5EA0410C8A17A Autocrypt: addr=bu7cher@yandex.ru; prefer-encrypt=mutual; keydata= mQENBEwBF1kBCADB9sXFhBEUy8qQ4X63Y8eBatYMHGEFWN9ypS5lI3RE6qQW2EYbxNk7qUC5 21YIIS1mMFVBEfvR7J9uc7yaYgFCEb6Sce1RSO4ULN2mRKGHP3/Sl0ijZEjWHV91hY1YTHEF ZW/0GYinDf56sYpDDehaBF5wkWIo1+QK5nmj3vl0DIDCMNd7QEiWpyLVwECgLX2eOAXByT8B bCqVhJGcG6iFP7/B9Ll6uX5gb8thM9LM+ibwErDBVDGiOgvfxqidab7fdkh893IBCXa82H9N CNwnEtcgzh+BSKK5BgvPohFMgRwjti37TSxwLu63QejRGbZWSz3OK3jMOoF63tCgn7FvABEB AAG0JUFuZHJleSBWLiBFbHN1a292IDxidTdjaGVyQHlhbmRleC5ydT6JATgEEwECACIFAkwB F1kCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEAHF6gQQyKF6qmYIAI6ekfm1VA4T vqankI1ISE6ku4jV7UlpIQlEbE7/8n3Zd6teJ+pGOQhN5qk8QE7utdPdbktAzi+x7LIJVzUw 4TywZLXGrkP7VKYkfg6oyCGyzITghefQeJtr2TN4hYCkzPWpylkue8MtmqfZv/6royqwTbN+ +E09FQNvTgRUYJYTeQ1qOsxNRycwvw3dr2rOfuxShbzaHBB1pBIjGrMg8fC5pd65ACH5zuFV A0CoTNGMDrEZSfBkTW604UUHFFXeCoC3dwDZRKOWJ3GmMXns65Ai5YkA63BSHEE1Qle3VBhd cG1w0CB5FBV3pB27UVnf0jEbysrDqW4qN7XMRFSWNAy5AQ0ETAEXWQEIAJ2p6l9LBoqdH/0J PEFDY2t2gTvAuzz+8zs3R03dFuHcNbOwjvWCG0aOmVpAzkRa8egn5JB4sZaFUtKPYJEQ1Iu+ LUBwgvtXf4vWpzC67zs2dDuiW4LamH5p6xkTD61aHR7mCB3bg2TUjrDWn2Jt44cvoYxj3dz4 S49U1rc9ZPgD5axCNv45j72tggWlZvpefThP7xT1OlNTUqye2gAwQravXpZkl5JG4eOqJVIU X316iE3qso0iXRUtO7OseBf0PiVmk+wCahdreHOeOxK5jMhYkPKVn7z1sZiB7W2H2TojbmcK HZC22sz7Z/H36Lhg1+/RCnGzdEcjGc8oFHXHCxUAEQEAAYkBHwQYAQIACQUCTAEXWQIbDAAK CRABxeoEEMihegkYCAC3ivGYNe2taNm/4Nx5GPdzuaAJGKWksV+w9mo7dQvU+NmI2az5w8vw 98OmX7G0OV9snxMW+6cyNqBrVFTu33VVNzz9pnqNCHxGvj5dL5ltP160JV2zw2bUwJBYsgYQ WfyJJIM7l3gv5ZS3DGqaGIm9gOK1ANxfrR5PgPzvI9VxDhlr2juEVMZYAqPLEJe+SSxbwLoz BcFCNdDAyXcaAzXsx/E02YWm1hIWNRxanAe7Vlg7OL+gvLpdtrYCMg28PNqKNyrQ87LQ49O9 50IIZDOtNFeR0FGucjcLPdS9PiEqCoH7/waJxWp6ydJ+g4OYRBYNM0EmMgy1N85JJrV1mi5i Message-ID: Date: Wed, 6 Mar 2019 15:37:04 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190305224610.frw5ov5bn6f3xaqg@hal9000.home.meka.rs> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Zb1JoHkvpJ5xXXHf8NjaUNcmA5JPi5SdB" X-Rspamd-Queue-Id: 61FF08BAFD X-Spamd-Bar: ------- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=yandex.ru header.s=mail header.b=s7nrC6y4; dmarc=pass (policy=none) header.from=yandex.ru; spf=pass (mx1.freebsd.org: domain of bu7cher@yandex.ru designates 2a02:6b8:0:1472:2741:0:8b7:108 as permitted sender) smtp.mailfrom=bu7cher@yandex.ru X-Spamd-Result: default: False [-7.91 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a02:6b8:0:1000::/52]; FREEMAIL_FROM(0.00)[yandex.ru]; HAS_ATTACHMENT(0.00)[]; RCVD_COUNT_THREE(0.00)[4]; DKIM_TRACE(0.00)[yandex.ru:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[yandex.ru,none]; MX_GOOD(-0.01)[mx.yandex.ru,mx.yandex.ru,mx.yandex.ru,mx.yandex.ru,mx.yandex.ru]; SIGNED_PGP(-2.00)[]; NEURAL_HAM_SHORT(-0.98)[-0.979,0]; RCVD_IN_DNSWL_LOW(-0.10)[8.0.1.0.7.b.8.0.0.0.0.0.1.4.7.2.2.7.4.1.0.0.0.0.8.b.6.0.2.0.a.2.list.dnswl.org : 127.0.5.1]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:+]; FREEMAIL_ENVFROM(0.00)[yandex.ru]; ASN(0.00)[asn:13238, ipnet:2a02:6b8::/32, country:RU]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[yandex.ru.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[yandex.ru:s=mail]; RCVD_TLS_LAST(0.00)[]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.20)[multipart/signed,multipart/mixed,text/plain]; IP_SCORE(-1.72)[ipnet: 2a02:6b8::/32(-4.79), asn: 13238(-3.83), country: RU(0.00)]; TO_MATCH_ENVRCPT_SOME(0.00)[] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Mar 2019 12:37:59 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --Zb1JoHkvpJ5xXXHf8NjaUNcmA5JPi5SdB Content-Type: multipart/mixed; boundary="tiQj4ZK7NUIZ8jRHohtrsV1FZ5AL7vgNj"; protected-headers="v1" From: "Andrey V. Elsukov" To: =?UTF-8?Q?Goran_Meki=c4=87?= , freebsd-net@freebsd.org Message-ID: Subject: Re: UDP broadcast References: <20190305224610.frw5ov5bn6f3xaqg@hal9000.home.meka.rs> In-Reply-To: <20190305224610.frw5ov5bn6f3xaqg@hal9000.home.meka.rs> --tiQj4ZK7NUIZ8jRHohtrsV1FZ5AL7vgNj Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 06.03.2019 01:46, Goran Meki=C4=87 wrote: > Hello, >=20 > I have a audio mixer which is controleable over network via android app= =2E > The discovery is done by sending broadcast UDP message "/info\0\0\0" to= > 255.255.255.255 (checked by tcpdump on the router). I thought I can do > the same with: >=20 > printf "/info\0\0\0" | nc -4u -w 0 255.255.255.255 10024 >=20 > But I never get the reply. This is what tcpdump sees: >=20 > tcpdump -nnSX -v 'src 192.168.5.80 or dst 255.255.255.255' > tcpdump: listening on re0, link-type EN10MB (Ethernet), capture size I think it is because netcat does not send real broadcast, you can add -e flag to tcpdump and compare ethernet destination addresses. --=20 WBR, Andrey V. Elsukov --tiQj4ZK7NUIZ8jRHohtrsV1FZ5AL7vgNj-- --Zb1JoHkvpJ5xXXHf8NjaUNcmA5JPi5SdB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQEzBAEBCAAdFiEE5lkeG0HaFRbwybwAAcXqBBDIoXoFAlx/vvQACgkQAcXqBBDI oXphtwgArNk3cSXuGl00FKDrcpfsuNWR4m4TSvGW1j85aRykim56l+wkom9XxwD8 UE5kobYZBT6tnosBh38Pouz1RiauY4F2kgawog7YCiUWNnIwKq2o8OjVDxArHtuN dwdkAWcpxn/nPjGrkyk2I4HwR9Dew3di5bWcAwQg0F79O+86XX/JCajKVoabbTGE ZIx4PCAFMM9hijDH/rrszKe634S92cO8SMcXlC+0eE22/KVt7/dww40VyJzh0TcA iSMrryozqd9btKJ8kPfIZv9I333DyPTJQAI1vZo7ul6o9Q37HWAro/pWUPICGt10 lTbPvQWsqwngEor5SUW3RuxlAqySpg== =6G49 -----END PGP SIGNATURE----- --Zb1JoHkvpJ5xXXHf8NjaUNcmA5JPi5SdB--