From nobody Mon Sep 16 20:05:39 2024 X-Original-To: freebsd-net@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4X6ws71NRPz5WrHR for ; Mon, 16 Sep 2024 20:06:03 +0000 (UTC) (envelope-from cross+freebsd@relay.distal.com) Received: from relay.wiredblade.com (relay.wiredblade.com [168.235.105.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4X6ws545tjz4t1W for ; Mon, 16 Sep 2024 20:06:01 +0000 (UTC) (envelope-from cross+freebsd@relay.distal.com) Authentication-Results: mx1.freebsd.org; dkim=pass header.d=relay.distal.com header.s=mail header.b=JYEYUcQT; dmarc=none; spf=pass (mx1.freebsd.org: domain of cross+freebsd@relay.distal.com designates 168.235.105.136 as permitted sender) smtp.mailfrom=cross+freebsd@relay.distal.com dkim-signature: v=1; a=rsa-sha256; d=relay.distal.com; s=mail; c=relaxed/relaxed; q=dns/txt; h=From:Subject:Date:Message-ID:To:CC:MIME-Version:Content-Type:Content-Transfer-Encoding; bh=xT4P4adtRIegx9v4T8CLsykLDEuhDJ9cvDbWLRnSQo4=; b=JYEYUcQThVCjnDSl8mB2/Siv91UB/Q89VxwFms8mz18bQBGndj4Gqj+v8mTSICUbvNOIYZwCK1ohKNT5qcZOf1xOWhv6dvQcUUP/ELeKT5TD+MadeE3DXu1l4hNBFfAWCAa+kS1GDIqARhfibBhW/qo37t9Twehiw1RhfeypAZ1jWjhRbC8oJ0hgkpl+Bs+cIA1LfhQoP9kwYZyKrBBxp4V1YI3Lm9IdE9bLVAUCunWypjRxFV0Y7J/+IH EhgTRiz49pdDsM8LU1vc3XlVt6tPhlnEjsl5u1nBBtg74tEz+I5yF8yKdWik+6mhFyMspupr/kxXGJGGVIiV77vN8SGQ== Received: from mail.distal.com (pool-108-51-233-124.washdc.fios.verizon.net [108.51.233.124]) by relay.wiredblade.com with ESMTPSA (version=TLSv1.2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256) ; Mon, 16 Sep 2024 20:05:53 +0000 Received: from smtpclient.apple ( [2001:420:c0c4:1006::585]) by tristain.distal.com (OpenSMTPD) with ESMTPSA id 28940cd9 (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256:NO); Mon, 16 Sep 2024 16:05:51 -0400 (EDT) From: Chris Ross Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable List-Id: Networking and TCP/IP with FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-net List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-net@FreeBSD.org Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3776.700.51\)) Subject: IPv6 neighbor flaps for ISP router are occurring frequently Message-Id: <89F4F5A4-E3D9-4A43-84F6-908E3FA221A6@distal.com> Date: Mon, 16 Sep 2024 16:05:39 -0400 Cc: Chris Ross To: freebsd-net@freebsd.org, Roy Marples X-Mailer: Apple Mail (2.3776.700.51) X-Spamd-Bar: --- X-Spamd-Result: default: False [-3.19 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.99)[-0.991]; FORGED_SENDER(0.30)[cross@distal.com,cross@relay.distal.com]; R_SPF_ALLOW(-0.20)[+a:relay.dynu.com]; R_DKIM_ALLOW(-0.20)[relay.distal.com:s=mail]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[distal.com]; ARC_NA(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[relay.distal.com:+]; TAGGED_FROM(0.00)[freebsd]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_NEQ_ENVFROM(0.00)[cross@distal.com,cross@relay.distal.com]; ASN(0.00)[asn:3842, ipnet:168.235.104.0/22, country:US]; MLMMJ_DEST(0.00)[freebsd-net@freebsd.org]; APPLE_MAILER_COMMON(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; TAGGED_RCPT(0.00)[freebsd]; TO_DN_SOME(0.00)[] X-Rspamd-Queue-Id: 4X6ws545tjz4t1W Hello. Following the earlier thread "DHCPv6 IA_PD - how-to=E2=80=9D I = have been bringing up a new gateway router for my network. With Roy=E2=80=99s = help, I have IPv6 working as expected, but I am seeing something that I suspect is unusual. Roy doesn=E2=80=99t think it=E2=80=99s specific to dhcpcd, = as it is caused by routing changes that dhcpcd is merely reacting to. While dhcpcd is running, it repeatedly logs the following to daemon.log: Sep 16 15:55:53 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce = is unreachable Sep 16 15:55:54 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce = is reachable again Sep 16 15:55:54 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router Sep 16 15:56:25 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce = is unreachable Sep 16 15:56:25 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce = is reachable again Sep 16 15:56:25 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router Sep 16 15:56:57 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce = is unreachable Sep 16 15:56:58 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router Sep 16 15:56:58 logrus dhcpcd[50070]: vlan0: Router Advertisement from = fe80::3e8a:b0ff:fe3e:4dce Sep 16 15:57:32 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce = is unreachable Sep 16 15:57:32 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router Sep 16 15:57:32 logrus dhcpcd[50070]: vlan0: Router Advertisement from = fe80::3e8a:b0ff:fe3e:4dce During this same time frame, =E2=80=9Croute monitor=E2=80=9D shows: 15:55:53.573 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state = PROBE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:55:54.002 PID 0 = add/repl neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr = 3c:8a:b0:3e:4d:ce iface vlan0 15:56:25.148 PID 0 delete neigh = fe80::3e8a:b0ff:fe3e:4dce%vlan0 state PROBE lladdr 3c:8a:b0:3e:4d:ce = iface vlan0 15:56:25.212 PID 0 add/repl neigh = fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr 3c:8a:b0:3e:4d:ce = iface vlan0 15:56:57.406 PID 0 delete neigh = fe80::3e8a:b0ff:fe3e:4dce%vlan0 state PROBE lladdr 3c:8a:b0:3e:4d:ce = iface vlan0 15:56:58.967 PID 0 add/repl neigh = fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr 3c:8a:b0:3e:4d:ce = iface vlan0 15:57:32.325 PID 0 delete neigh = fe80::3e8a:b0ff:fe3e:4dce%vlan0 state PROBE lladdr 3c:8a:b0:3e:4d:ce = iface vlan0 15:57:34.143 PID 0 add/repl neigh = fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr 3c:8a:b0:3e:4d:ce = iface vlan0 =20 My concern is that this is sending RS=E2=80=99s to my provider far too = often. Can anyone advise if this is normal, and assuming not, what might be wrong? Trimmed dhcpcd.conf is: duid persistent vendorclassid option classless_static_routes option rapid_commit require dhcp_server_identifier slaac private noipv6rs noipv4 noipv4ll allowinterfaces vlan0 interface vlan0 ipv6only ipv6rs ipv6ra_autoconf ia_pd 0/::/56 intnet1/42 intnet2/56 Thanks. - Chris