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Mon, 12 Apr 2021 10:53:01 +0000 (UTC) Date: Mon, 12 Apr 2021 12:52:22 +0200 From: Michael Gmelin To: =?UTF-8?B?w5Z6a2Fu?= KIRIK Cc: FreeBSD Net Subject: Re: jail - vnet bug - ping: UDP connect: No route to host Message-ID: <20210412125222.16610891@bsd64.grem.de> In-Reply-To: References: X-Face: $wrgCtfdVw_H9WAY?S&9+/F"!41z'L$uo*WzT8miX?kZ~W~Lr5W7v?j0Sde\mwB&/ypo^}> +a'4xMc^^KroE~+v^&^#[B">soBo1y6(TW6#UZiC]o>C6`ej+i Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAJFBMVEWJBwe5BQDl LASZU0/LTEWEfHbyj0Txi32+sKrp1Mv944X8/fm1rS+cAAAACXBIWXMAAAsTAAAL EwEAmpwYAAAAB3RJTUUH3wESCxwC7OBhbgAAACFpVFh0Q29tbWVudAAAAAAAQ3Jl YXRlZCB3aXRoIFRoZSBHSU1QbbCXAAAAAghJREFUOMu11DFvEzEUAGCfEhBVFzuq AKkLd0O6VrIQsLXVSZXoWE5N1K3DobBBA9fQpRWc8OkWouaIjedWKiyREOKs+3PY fvalCNjgLVHeF7/3bMtBzV8C/VsQ8tecEgCcDgrzjekwKZ7TwsJZd/ywEKwwP+ZM 8P3drTsAwWn2mpWuDDuYiK1bFs6De0KUUFw0tWxm+D4AIhuuvZqtyWYeO7jQ4Aea 7jUqI+ixhQoHex4WshEvSXdood7stlv4oSuFOC4tqGcr0NjEqXgV4mMJO38nld4+ xKNxRDon7khyKVqY7YR4d+Cg0OMrkWXZOM7YDkEfKiilCn1qYv4mighZiynuHHOA Wq9QJq+BIES7lMFUtcikMnkDGHUoncA+uHgrP0ctIEqfwLHzeSo+eUA66AqzwN6n 2ZHJhw6Qh/PoyC/QENyEyC/AyNjq74Bs+3UH0xYwzDUC4B97HgLocg1QLYgDDO1v f3UX9Y307Ew4AHh67YAFFsxEpkXwpXY3eIgMhAAE3R19L919nNnuD2wlPcDE3UeT L2ytEICQib9BXgS2fU8PrD82ToYO1OEmMSnYTjSqSv9wdC0tPYC+rQRQD9ESnldF CyqfmiYW+tlALt8gH2xrMdC/youbjzPXEun+/ReXsMCDyve3dZc09fn2Oas8oXGc Jj6/fOeK5UmSMPmf/jL+GD8BEj0k/Fn6IO4AAAAASUVORK5CYII= MIME-Version: 1.0 Content-Type: text/plain; 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ASN(0.00)[asn:24940, ipnet:213.239.192.0/18, country:DE]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-net] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Apr 2021 10:53:08 -0000 On Sun, 11 Apr 2021 07:42:23 +0300 =C3=96zkan KIRIK wrote: > Hello, >=20 >=20 > root@f13:~ # jexec client ping www.google.com > ping: UDP connect: No route to host >=20 > root@f13:~ # jexec client ping -4 -c 2 www.google.com > PING www.google.com (216.58.212.100): 56 data bytes > 64 bytes from 216.58.212.100: icmp_seq=3D0 ttl=3D128 time=3D85.487 ms > 64 bytes from 216.58.212.100: icmp_seq=3D1 ttl=3D128 time=3D90.243 ms >=20 > --- www.google.com ping statistics --- > 2 packets transmitted, 2 packets received, 0.0% packet loss > round-trip min/avg/max/stddev =3D 85.487/87.865/90.243/2.378 ms > root@f13:~ # That's interesting - ping6 was merged into ping last year, the basic logic of deciding which AF to use is here: https://cgit.freebsd.org/src/tree/sbin/ping/main.c#n128 Essentially it does: 1. IPv6 disabled? Use IPv4 else 2. IPv4 disabled? Use IPv6 else 3. do hostname lookup and decide based on the AF of the first result. As far as I can tell, the result of 3. is not used for the ping though, but only to decide if ping6 or ping should be done. I wonder if this is actually a good idea - gut feeling-wise I would prefer only one lookup to take place when calling ping. That said, what happens if you call: jexec client ping -6 -c 2 www.google.com I assume that should give you some output (including an IP address), even though the ping6 itself will fail. Also, what is your /etc/resolv.conf inside the jail? I suspect that the problem is caused by the gethostbyaddr call in 3. and is not directly IPv6 related - if I compare the code used by ping.c and ping6.c (including capsicum support) with what 3. does, we might have a bigger problem here. Best, Michael > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" --=20 Michael Gmelin