Date: Wed, 6 Mar 2019 12:45:59 +0100 From: Goran =?utf-8?B?TWVracSH?= <meka@tilda.center> To: Eugene Grosbein <eugen@grosbein.net> Cc: freebsd-net@freebsd.org Subject: Re: UDP broadcast Message-ID: <20190306114558.yjci5benmnsazrun@hal9000.home.meka.rs> In-Reply-To: <149e7a2f-6297-3478-e8c0-64baeeb02d8b@grosbein.net> References: <20190305224610.frw5ov5bn6f3xaqg@hal9000.home.meka.rs> <149e7a2f-6297-3478-e8c0-64baeeb02d8b@grosbein.net>
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--kk3xj37ngyizhqjj Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Mar 06, 2019 at 03:52:31PM +0700, Eugene Grosbein wrote: > 06.03.2019 5:46, Goran Meki=C4=87 wrote: > As shown, nc generates UDP datagramm without (optional) checksum. It's because of offloading. When I check it on router, checksum is fine. > > So what am I doing wrong and how can I send UDP broadcast from either s= cript of C code? Thank you! > > You should try ncat from security/nmap instead of nc. Tried it with this: printf "/info\0\0\0" | ncat -4u 255.255.255.255 10024 Absolutely same result. If I use mixer IP I get the response, so I know what I'm sending is OK: printf "/info\0\0\0" | ncat -4u 192.168.5.80 10024 It works with ncat and nc. Regards, meka --kk3xj37ngyizhqjj Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE1WIFkXy2ZeMKjjKEWj1TknovrLYFAlx/svQACgkQWj1Tknov rLa7pw//SxAl/SHPNAuIYrgZYyKq9Di5PQ1Dxt3k0mI4qMvWfdgwPzeUk781xBDK zIudjy5XkNbEtDSThdVDi4Bl1VJY6b4rsYv8XdIyg1cS+MA2pP43PLLmW7byzx7b w+c704YAbaSuA7ygrGcTnGNFdOkPTJUIoz1jeWZVfywKvww26TT58VLWFp9AC/C7 eORx7bEU0gIR7mNme2vR87mLQyj/JWag9kbGWjIQJMl8pzvB2ggXagEGUHIY0Ac8 wxKn3LgpCc5mMONnIzNMxrLsOOaNDCRulMlA7O+Pyhf7+XW2ABMrZTA7gFqPP48z y11zLem5vdxTirx9sQfPZoIus0Owab0hwXYlWDHczgbVci/t0T3sfcNw2tyIFslU O1jYR0gjMWRCe1fP7AugKAjpYuqKEPMJK70cIi25t/taF4E3IHPKBCIc9NoRzwW9 k8C9SD3zOnbFeEha54GYdYUTtAWtdBGI8U9cUS4dXH9mcRTWi5fELjFlsJczlZgo 7YPs5CI00o8YcWugI4lL6R4Twn6D6tiZuYvKhBVz6qyUBVgPSC2e8J7zuOL9wVOC rAL05RCs7uJPdqwLIIAVxUWTu/cFcu6V+UKnfg6JuTisEY4Av7oHLbHL7AkWjNq+ bw8sKjRReESvROiEy1RJvnLo8KLIXA62vcrKcNwmZtFrgw82D7U= =wXmD -----END PGP SIGNATURE----- --kk3xj37ngyizhqjj--
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