From owner-freebsd-questions@freebsd.org Sun May 29 18:45:15 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B71E6B54D7B for ; Sun, 29 May 2016 18:45:15 +0000 (UTC) (envelope-from b.manas.88@gmail.com) Received: from mail-qg0-x229.google.com (mail-qg0-x229.google.com [IPv6:2607:f8b0:400d:c04::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 6733B1830 for ; Sun, 29 May 2016 18:45:15 +0000 (UTC) (envelope-from b.manas.88@gmail.com) Received: by mail-qg0-x229.google.com with SMTP id 52so5445258qgy.0 for ; Sun, 29 May 2016 11:45:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to; bh=smi4FyP8H4T3TdxVy8CBISqw36SM0R37rlFmz4v+nk0=; b=EZXEwLDjwGLnCwIWonRmaIdJNtKwhgfAoo6ARWErhoK6HDa3HPccyWjlUe1l83fJEq W/6MKMXujFtsq3X9XUxEcFzOeynTGf8No/PP3z/svP81iGhDFPgnO+qjxTNQlc94+p/q WaQA6L96Lo2UFAh39pEsKYesz/GESre42whRmGQ24TM+KTSYpSxahm9iz4wjw2H/5GDv czGriq6DllXWadPdwLPuuoo6Vo56fqxnfyBSxde8tQgPMwhnQFrelfzTcB7DbBVeaRTS vnqmnSzuUo3Vm7F+QiA7k2RKkWrSfi8SonJ11lY1FqcY3A76S7uL95OCIj3uEghyHy5S 5h1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=smi4FyP8H4T3TdxVy8CBISqw36SM0R37rlFmz4v+nk0=; b=eTb/w8tUV93SdJAuAs3JYwzeVAPkmn63iLMuzxvwV7aYrm4Iym/yC9+CGZ3UC8Hv8p Qj7EAjUO1I6WvDtvj/fmMAQQAd+09vWaWCmzFpIA0/jHqNqT0ZKXh/ACKOuAmvELAf/C JviESNgkxv9B+R5+1Cvpf2EC1Fd1qYBsEUMDDv1bl4YQDqmESkpGIJS46ZGFE/rcss3Y zonzYXeF51uxNMT87uE11TTrnDZJ2uvnEbSmQ3Op1L+udifBOdQfVjBiWIO434TLCV+p 2i5PXTaNJJm2ta5J5f0Pff1Y29CVbfhaCkXACwMMh7FUugKlU1RMR5Iglgupiztq90Al Px0g== X-Gm-Message-State: ALyK8tKfYUOx1U5jwBsb8mT0S8p1m5Tib89un8Vf/ejFFK8Sp8khhkAJ7J0HOziImMv3CB659pe3RIH1ISIIwQ== MIME-Version: 1.0 X-Received: by 10.140.247.138 with SMTP id s132mr23542293qhc.52.1464547514643; Sun, 29 May 2016 11:45:14 -0700 (PDT) Received: by 10.140.21.146 with HTTP; Sun, 29 May 2016 11:45:14 -0700 (PDT) Date: Sun, 29 May 2016 14:45:14 -0400 Message-ID: Subject: Possible bug with SCTP and iperf3? From: Manas Bhatnagar To: freebsd-questions@freebsd.org Content-Type: text/plain; charset=UTF-8 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 May 2016 18:45:15 -0000 Hello, I experienced a hard reset of a system recently, running FreeBSD 10-RELEASE, while running iperf3. I do not know much about SCTP nor iperf3, I was just fiddling around with iperf3 arguments. These are the commands I ran: iperf3 -c $IP -P 32 -t 60 iperf3 -u -c $IP -P 32 -t 60 iperf3 --sctp -c $IP -P 32 -t 60 iperf3 --sctp -c $IP -P 4 -t 60 iperf3 --sctp -c $IP -t 60 iperf3 --sctp --nstreams 64 -c $IP -P 32 -t 60 iperf3 --sctp --nstreams 2 -c $IP -P 32 -t 60 What I remember is that the second last command would not show any data as being transferred and when I ran the last command, the system running the iperf3 server did a hard reset. I don't know if this is a bug or not but it seems to my inexperienced eyes like it is something that could be used maliciously to bring down a system running 'iperf3 -s' and so I thought it would be best to share this with the mailing list. Thank you, Manas