From owner-freebsd-xen@freebsd.org Mon Feb 27 17:48:13 2017 Return-Path: Delivered-To: freebsd-xen@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 989D5CEF8F8 for ; Mon, 27 Feb 2017 17:48:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (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 881FEECA for ; Mon, 27 Feb 2017 17:48:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v1RHmDan044853 for ; Mon, 27 Feb 2017 17:48:13 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-xen@FreeBSD.org Subject: [Bug 188990] [xen] dhclient(8) does not accept DHCP Offer on FreeBSD 10 as Xen DomU Guest Date: Mon, 27 Feb 2017 17:48:13 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: 10.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: bhavesh.davda@gmail.com X-Bugzilla-Status: In Progress X-Bugzilla-Resolution: X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: freebsd-xen@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-xen@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussion of the freebsd port to xen - implementation and usage List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Feb 2017 17:48:13 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D188990 --- Comment #11 from Bhavesh Davda --- (In reply to Roger Pau Monn=C3=83=C2=A9 from comment #9) Yes, in a FreeBSD 11.0 VM, I had already verified this workaround works: in /etc/rc.conf: ifconfig_XN0=3D"DHCP -rxcsum" Note that you only need to disable Rx checksum offload, as the issue is with UDP BOOTP packets received with an offloaded but "invalid" UDP checksum. However, I expect this workaround to have an unnecessary performance impact= on receive packet throughput over xn0; basically you're using a 'big hammer' to completely disable an offload only because one application (dhclient) can't deal with a couple of UDP packets. More comments in a separate update... --=20 You are receiving this mail because: You are the assignee for the bug.=