From owner-freebsd-net@freebsd.org Tue Oct 13 00:04:20 2015 Return-Path: Delivered-To: freebsd-net@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 387F39D1322 for ; Tue, 13 Oct 2015 00:04:20 +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 24AC8F25 for ; Tue, 13 Oct 2015 00:04:20 +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 t9D04KwA054184 for ; Tue, 13 Oct 2015 00:04:20 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-net@FreeBSD.org Subject: [Bug 203630] [Hyper-V] [nat] [tcp] 10.2 NAT bug in TCP stack or hyperv netsvc driver Date: Tue, 13 Oct 2015 00:04:19 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.2-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: onyx@netfusion.fr X-Bugzilla-Status: New X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Oct 2015 00:04:20 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203630 --- Comment #5 from onyx@netfusion.fr --- I encounter the same problem in a slightly different configuration: - Hyper-V 2012, hosting: -- FreeBSD 10.2 x64 with MPD acting as a PPTP server -- Windows 7 - Clients on the LAN (misc OS), inclding an old FreeBSD 6.1 - Clients connected to FreeBSD 10.2 VM by PPTP (MPD5) using misc OS as well Firewalls turned off. * TCP, UDP, ICMP work: - between all PPTP clients - between a PPTP client, FreeBSD and the Windows 7 virtual machine - between FreeBSD and local machines on the LAN * TCP doesn't work between a PPTP client and machines on the LAN. I tried to investigate by opening a TCP connection on port 80 from a PPTP client to the old FreeBSD 6.1 on the LAN. There is a part of the tcpdump I ran on that old FreeBSD 6.1: IP (tos 0x0, ttl 127, id 20111, offset 0, flags [DF], proto: TCP (6), length: 48) pc-ed.lan.domain.fr.56026 > srv-mandy.lan.domain.fr.http: S, cksum 0x84d6 (incorrect (-> 0x7c54), 2429810306:2429810306(0) win 8192 I have read that having an incorrect checksum was normal, so I guess the problem doesn't come from that. >From what I saw, the problem occurs as long as the FreeBSD 10.2 is used as a gateway (NAT or not). Let me know if I can do other tests to help you investigate the problem. Any help would be appreciated. -- You are receiving this mail because: You are on the CC list for the bug.