From owner-freebsd-net@freebsd.org Tue Jun 21 06:48:09 2016 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 1F6E3A7BBC7 for ; Tue, 21 Jun 2016 06:48:09 +0000 (UTC) (envelope-from stdin@niklaas.eu) Received: from box-hlm-03.niklaas.eu (box-hlm-03.niklaas.eu [84.22.110.84]) by mx1.freebsd.org (Postfix) with ESMTP id E297E2DA8 for ; Tue, 21 Jun 2016 06:48:08 +0000 (UTC) (envelope-from stdin@niklaas.eu) Received: by box-hlm-03.niklaas.eu (Postfix, from userid 1001) id 91D3C385519; Tue, 21 Jun 2016 08:48:00 +0200 (CEST) Date: Tue, 21 Jun 2016 08:48:00 +0200 From: Niklaas Baudet von Gersdorff To: freebsd-net@freebsd.org Subject: Re: ARP table entries / ifconfig needs to be issued twice when moving IP Message-ID: <20160621064800.GB8441@box-hlm-03.niklaas.eu> Mail-Followup-To: freebsd-net@freebsd.org References: <20160621022723.5e785573@bsd64.grem.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="qtZFehHsKgwS5rPz" Content-Disposition: inline In-Reply-To: <20160621022723.5e785573@bsd64.grem.de> User-Agent: Mutt/1.6.1 (2016-04-27) X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.22 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, 21 Jun 2016 06:48:09 -0000 --qtZFehHsKgwS5rPz Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Michael Gmelin [2016-06-21 02:27 +0200] : > I'm not sure if it's just me being tired, but I'm facing the following > problem on 10.3-RELEASE when moving an IPv4 alias from one host to > the other. This is an example of what I'm seeing: [...] > It's still in the arp table as a non-permanent entry, pointing to the > Box 1. >=20 > Box 2: Issue ifconfig once more: [...] > Now it's set to the local ethernet address in the arp table > permanently. Reminds me of what I encountered recently with two virtual machines at my provider. I haven't further dug into this, as I didn't check `arp -an`, but what I saw was switching an IP address from hosts A to B resulted in pings from host C to arrive at A. Host C said they got lost while tcpdump showed incoming packets at A although they should have gone to B. Niklaas --qtZFehHsKgwS5rPz Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJXaOMTAAoJEG2fODeJrIU/jxoP/1z9CBIuv2oyUox4hhspldoV ytee8o2KqVFyhq6U/hir1169iW8GJ5C0DMyHhfStvitfAY9wrkmr2OwmWqRyFE91 ORzSlH3koDKij5g920LXOUxXxZeS+Nn2dzSUvRQe1E1C+1AQh4i9aywDVdIFFJwp vkDuM5d4dx/C5j4U/1RIzKay6O0YThfjJemE/ms+9jqH81GcSK7JnRZt4jetGV9F HbS10JkYdvdNatfL8oBVXZGbsiI9Zqr+SNi9wJjAKvq6hC3y/0T7Wlz38pOakIwV g2VHu70N12D795RL5ZEjKB6QDpHDssYF4eS2JVYQX+riW1etlOvT4Y0caBNVXzBc 1F/yZWwCHZedI/WVQcZqu3SoKM5SeKMtt2IDOax+pAVI1tpsmr8pnz+NNIRMbnta rKi1mbEt38PzgHVdMjl8lZg8uljI6r7nh/P5x4/CKrLofWieQkJ/lQQznXH45jfH PzPs/43yQR9P8ZKEk2vcM4dIpYTQqTuWAxC+Y4ZDuilqBbF2Pp4oZ26guv9cgmnX QWdwkV9fCKQ6y8k0qCKb/PgfFf6proFzxh4KKvR0Mu9/bIj5koJaVy24OhNsnoNv K9LV9mpbW+dpTq2iTgdl1ehL6eeWvjP2RDn/vn+aC2Uuhi7vPuQBxJ9PqZx4tcvR eVWiq8YP5WosB0/GOt5I =muFm -----END PGP SIGNATURE----- --qtZFehHsKgwS5rPz--