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([2403:5807:1b:1:79b8:94ce:e5d2:9f00]) by smtp.gmail.com with ESMTPSA id d20sm10544569pfl.88.2021.12.17.17.16.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 17 Dec 2021 17:16:40 -0800 (PST) Message-ID: <5140f4e1-df13-ebaa-341e-5274ead366ce@FreeBSD.org> Date: Sat, 18 Dec 2021 12:16:36 +1100 List-Id: Production branch of FreeBSD source code List-Archive: https://lists.freebsd.org/archives/freebsd-stable List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-stable@freebsd.org X-BeenThere: freebsd-stable@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:97.0) Gecko/20100101 Thunderbird/97.0a1 Reply-To: koobs@FreeBSD.org Subject: Re: ping -6 ignores -e parameter Content-Language: en-US To: KOT MATPOCKuH Cc: freebsd-stable List , Alan Somers References: <22748b81-2ae8-babd-d07e-752ed15dce58@GMail.Com> From: Kubilay Kocak In-Reply-To: <22748b81-2ae8-babd-d07e-752ed15dce58@GMail.Com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4JG7H35D5qz4lhx X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=U9CK8LNR; dmarc=none; spf=pass (mx1.freebsd.org: domain of koobsfreebsd@gmail.com designates 2607:f8b0:4864:20::62c as permitted sender) smtp.mailfrom=koobsfreebsd@gmail.com X-Spamd-Result: default: False [-1.49 / 15.00]; HAS_REPLYTO(0.00)[koobs@FreeBSD.org]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; REPLYTO_ADDR_EQ_FROM(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FREEMAIL_TO(0.00)[gmail.com]; FORGED_SENDER(0.30)[koobs@FreeBSD.org,koobsfreebsd@gmail.com]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; TAGGED_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; FROM_NEQ_ENVFROM(0.00)[koobs@FreeBSD.org,koobsfreebsd@gmail.com]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; NEURAL_HAM_MEDIUM(-0.74)[-0.739]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[FreeBSD.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_SPAM_LONG(0.45)[0.447]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::62c:from]; RCVD_TLS_ALL(0.00)[] X-ThisMailContainsUnwantedMimeParts: N On 16/12/2021 9:30 pm, KOT MATPOCKuH wrote: > Hello, Alan! > > I'm sorry, I'm forget to add freebsd-stable@ to CC: list. > > Yes, I'm using FreeBSD 13: > 13.0-STABLE > > Today I have a native IPv6 access and my inet6 routing table is: > # netstat -rn6 | grep -v -e lo0 > Routing tables > > Internet6: > Destination                       Gateway                       Flags > Netif Expire > default                           fe80::206:29ff:fee9:32a9%lan0 UG    lan0 > fd00:dead:beef:100::/64           link#5                        U    lan0 > fe80::%lan0/64                    link#5                        U    lan0 > fe80::%bridge0/64                 link#6                        U bridge0 > > This means my default gateway is reachable via lan0. > A node which link-local address fe80::2a0:98ff:fe1d:e270 is reachable > via bridge0: > # ping -c 1 fe80::2a0:98ff:fe1d:e270%bridge0 > PING6(56=40+8+8 bytes) fe80::5a9c:fcff:fe10:ff9e%bridge0 --> > fe80::2a0:98ff:fe1d:e270%bridge0 > 16 bytes from fe80::2a0:98ff:fe1d:e270%bridge0, icmp_seq=0 hlim=64 > time=0.804 ms > > But ping anyway sends packets via lan0. > Also I tried to configure fd13:dead:beef::2 on bridge0, on corresponding > node I configured fd13:dead:beef::1, and then run a command: > ping -6 -e fd13:dead:beef::1 google.com > > In this way ping uses source IP address from bridge0 interface, but > sends via lan0 and to next-hop fe80::206:29ff:fee9:32a9%lan0: > # tcpdump -epni lan0 icmp6 > 12:33:23.308763 8c:ec:4b:e9:28:23 > 00:06:29:e9:32:a9, ethertype IPv6 > (0x86dd), length 70: fd13:dead:beef::2 > 2a00:1450:4010:c1e::8a: ICMP6, > echo request, seq 52, length 16 > > I'm wrote a simple script to check this problem. I checked this script > on image of VM from freebsd'site which FreeBSD-13. > Please see attached file. > > On 15/12/2021 21:32, Alan Somers wrote: >> On Wed, Dec 15, 2021 at 11:16 AM KOT MATPOCKuH >> wrote: >>> >>> Hello! >>> >>> In a man page for ping(8) and in it's help output I found option "-e": >>>       -e gateway >>>               Specifies to use gateway as the next hop to the >>> destination.  The >>>               gateway must be a neighbor of the sending node. >>> >>> I tried to use this argument, ping ignores this parameter and sends >>> the packet via default gateway. >>> For example I have a tun0 which has ipv6 default gw, and an >>> established bridge0 which has available some LL addresses: >>> Neighbor                             Linklayer Address  Netif >>> Expire    S Flags >>> fe80::2a0:98ff:fe1d:e270%bridge0     00:a0:98:1d:e2:70 bridge0 >>> 23h56m34s S R >>> >>> I tried to run: >>> ping -6 -e FE80::2A0:98FF:FE1D:E270%bridge0 google.com >>> But the packet was sent via tun0 interface. >>> >>> What is wrong with it? >>> >>> -- >>> MATPOCKuH >> >> What version of FreeBSD are you using?  There was a major change to >> ping's code in FreeBSD 13.  Please show the output of >> 'freebsd-version' and 'netstat -rn'. >> -Alan >> > Potentially relevant issue issue who's stable/13 merge landed 2021-12-13: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258048 Is your uname -a version prior to or after this date? If after, can you test reverting this revision?