From owner-freebsd-questions@freebsd.org Mon Oct 3 15:35:14 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 A3689AF37F1 for ; Mon, 3 Oct 2016 15:35:14 +0000 (UTC) (envelope-from kudzu@tenebras.com) Received: from mail-yb0-x235.google.com (mail-yb0-x235.google.com [IPv6:2607:f8b0:4002:c09::235]) (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 66CDC972 for ; Mon, 3 Oct 2016 15:35:14 +0000 (UTC) (envelope-from kudzu@tenebras.com) Received: by mail-yb0-x235.google.com with SMTP id 191so11937776ybv.3 for ; Mon, 03 Oct 2016 08:35:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tenebras-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=q3oI63nEr8JBeuqBonb1JBjyb35ZIsByDJ6aIpZP9yw=; b=DBgzzl6cE0VyyQ2wcSkwoCIJJoK1BuSavTyMAhAc6wZgB6aMvaU0S91VZLOi1n0rJ+ LVKVvdM3+pGhMr+vU6BJAOWtAxxGDylTFmf4rDgMz+54yigVfZm57JPRGlcKu/GXXcHF U5bDlJdAVdt0ERdvTXZxPUwuSJaJghz8QQA/kc1jyozU4IY9n+yMCCKD8ECb2I1iZgLg 6OiKNEqEn3kIPVT8Ptgqr+Jb+UDoAS/OitnnAcufW/O3tcz4XUJiZKx6QZ/JBIBFSA9V ZnxTR/0fkWTmkIgvbICdFESK/VCCYySoH6t3u5SGfGKBa9j0DEp+dy0A8ZvGRHuji73c SnVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=q3oI63nEr8JBeuqBonb1JBjyb35ZIsByDJ6aIpZP9yw=; b=UfxYM/ZmqgGNujoITvesXF6YVJtB3xeyCMDowloU9K7osP437VCyElgYa4IhxJxQJa 1PRIrdxI7IpjvIKp9xS0K9+WNTQ2F5DZEFz53OPDR6K30OXJIQSLYwhiUs/qY/ZMigc2 3x6UsaT/l8HoEi32B+LjoUOYIktRxilAnC4Yv6Ge2DRYLo1tdlrDm6YSO9jL7V0/8kJ8 MrAs7Rbo1GQqN9QALjcVCkfjKs9IGMYLek0RHNHenDuxcr9f/OB4V5pALyLUe7qvdhz2 RnsclC1sPPn1tZvBZ4FX90D4aERkztc5ZGdzK99upAb/uFdPmTsAe/p1SxegD2uqoPRw e95w== X-Gm-Message-State: AA6/9RmYFCqZj2b5sGuCgWkNXZwkiNn5EqvJ+AopVoW41QNZFZdLdUxvzSsLzn9x9G0B/e1GgJLELt7qOuXOiQ+I X-Received: by 10.37.37.3 with SMTP id l3mr16216025ybl.74.1475508913620; Mon, 03 Oct 2016 08:35:13 -0700 (PDT) MIME-Version: 1.0 Received: by 10.37.172.7 with HTTP; Mon, 3 Oct 2016 08:35:13 -0700 (PDT) In-Reply-To: <76dab24c-6c16-4935-779a-a9ef65df8d18@seacom.mu> References: <76dab24c-6c16-4935-779a-a9ef65df8d18@seacom.mu> From: Michael Sierchio Date: Mon, 3 Oct 2016 08:35:13 -0700 Message-ID: Subject: Re: UDP Traceroute on FreeBSD To: Mark Tinka Cc: FreeBSD Questions Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Oct 2016 15:35:14 -0000 On Mon, Oct 3, 2016 at 5:52 AM, Mark Tinka wrote: > > Can anyone tell me whether FreeBSD is able to respond to traceroute > packets transported over UDP? > Absolutely, yes - unless firewall rules drop stray UDP packets inbound, or the kernel parameter net.inet.udp.blackhole is set to 1. Also note that traceroute only yields the expected behavior (an ICMP PORT_UNREACHABLE which terminates the trace) if nothing is listening on the selected port on the IP address you're tracerouting to. --=20 "Well," Brahma said, "even after ten thousand explanations, a fool is no wiser, but an intelligent man requires only two thousand five hundred." - The Mah=C4=81bh=C4=81rata