From nobody Thu Sep 19 17:43:00 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 4X8jYB2tDQz5WhHH for ; Thu, 19 Sep 2024 17:43:26 +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 4X8jY82tpFz45K1 for ; Thu, 19 Sep 2024 17:43:24 +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=rN02UwfB; 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:In-Reply-To:References; bh=FnQqKiSXbBfRTUkdHu9gsEt33KZ/Z8ZsRBtMJrQTnxo=; b=rN02UwfBT/bv/cjoihg1Z/69p4npegyxx3Zzl4kWeB9vovK6XLNNP8UMleXL6+6sqtKXsBhhTkiwlFU+I8damw3YagRrfYJCpQGBmEVOWHex4SOP3DhRnHdPpqFQ3b4h97XZJ4x+WD+GYq3xSREai1YYlGtFudIu40uW9RIo+ocevejTM23ee2LT5Iwd0go/EzWs99a9LwHlwHh6Zl5W/BXNGmFtzHoz614NrPYtpPc5nOYaLGDZIXlxH4 0BlXX6gK8XqrywMAh3StUPQ+wouU7hxpo2FvGGglhDTEepxqpWgMMRCBsVF45z5QMcTQqYm9iE5RQJpSfSE0HVrvRSWQ== 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) ; Thu, 19 Sep 2024 17:43:15 +0000 Received: from smtpclient.apple ( [173.38.117.75]) by tristain.distal.com (OpenSMTPD) with ESMTPSA id b33448c0 (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256:NO); Thu, 19 Sep 2024 13:43:13 -0400 (EDT) Content-Type: text/plain; charset=utf-8 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: Re: IPv6 neighbor flaps for ISP router are occurring frequently From: Chris Ross In-Reply-To: Date: Thu, 19 Sep 2024 13:43:00 -0400 Cc: Karl Denninger Content-Transfer-Encoding: quoted-printable Message-Id: <80124FC7-3C96-489C-803D-D0310FBA3D05@distal.com> References: <89F4F5A4-E3D9-4A43-84F6-908E3FA221A6@distal.com> <83BCC913-3375-4847-B720-5F06D76F6646@distal.com> <6CFC398B-BC5C-4CFC-8733-8D9732B121CA@distal.com> To: freebsd-net@freebsd.org X-Mailer: Apple Mail (2.3776.700.51) X-Spamd-Result: default: False [-3.20 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FORGED_SENDER(0.30)[cross@distal.com,cross@relay.distal.com]; R_DKIM_ALLOW(-0.20)[relay.distal.com:s=mail]; R_SPF_ALLOW(-0.20)[+a:relay.dynu.com]; MIME_GOOD(-0.10)[text/plain]; RCVD_TLS_ALL(0.00)[]; TAGGED_FROM(0.00)[freebsd]; DMARC_NA(0.00)[distal.com]; RCPT_COUNT_TWO(0.00)[2]; DKIM_TRACE(0.00)[relay.distal.com:+]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; 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]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; MLMMJ_DEST(0.00)[freebsd-net@freebsd.org]; APPLE_MAILER_COMMON(0.00)[]; TO_DN_SOME(0.00)[] X-Rspamd-Queue-Id: 4X8jY82tpFz45K1 X-Spamd-Bar: --- > On Sep 17, 2024, at 14:46, Chris Ross = wrote: >=20 > Hmm. Well, I updated my releng/14.1 tree and built a new kernel last = night. > I rebooted and after dhcpcd started up it was emitting the same = notices > for many hours. But, at about 07:30 this morning it stopped. It=E2=80=99= s now been > 7 hours since there have been any such notices from dhcpcd. And, I = can=E2=80=99t > think of what couple. hanged. dhcpcd has been running for 15+ hours, > complained for 8 hours, then stopped for 7. I=E2=80=99ll keep an eye = on it, but > suffice to say I=E2=80=99m perplexed. Alright. Coming back to this, I was clearly not paying attention. At = the time I stopped seeing the aforementioned problem, a new one started. = There seemed to be some sort of link flap on my local interfaces a couple of times the morning of Sept 17, and after that IPv6 wasn=E2=80=99t = working. The next-hop and router seems to be unreachable now. All =E2=80=9Croute monitor=E2=80=9D has been showing me of late is: 12:59:49.473 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state = INCOMPLETE iface vlan0 12:59:53.522 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state = INCOMPLETE iface vlan0 12:59:57.450 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state = INCOMPLETE iface vlan0 I restarted dhcpcd, and it acquired an address reportedly from this same peer. Well, maybe I=E2=80=99m wrong and it just reestablished based on = the prior delegation: Sep 19 12:39:25 logrus dhcpcd[50864]: main: pidfile_lock: = /var/run/dhcpcd/pid: Permission denied Sep 19 12:39:29 logrus dhcpcd[52739]: dhcpcd-10.0.10 starting Sep 19 12:39:29 logrus dhcpcd[53589]: DUID = 00:01:00:01:2e:3e:5e:7f:a4:53:0e:79:b9:82 Sep 19 12:39:29 logrus dhcpcd[53589]: vlan0: IAID ff:00:00:06 Sep 19 12:39:29 logrus dhcpcd[53589]: vlan0: IA type 25 IAID 00:00:00:00 Sep 19 12:39:29 logrus dhcpcd[53589]: vlan0: rebinding prior DHCPv6 = lease Sep 19 12:39:29 logrus dhcpcd[53589]: intnet1: activating for delegation Sep 19 12:39:29 logrus dhcpcd[53589]: intnet1: IAID ff:00:00:05 Sep 19 12:39:29 logrus dhcpcd[53589]: intnet2: activating for delegation Sep 19 12:39:29 logrus dhcpcd[53589]: intnet2: IAID ff:00:00:03 Sep 19 12:39:29 logrus dhcpcd[53589]: intnet3: activating for delegation But, in either case, I still have a default inet6 route, but it isn=E2=80=99= t working because the next-hop seems to be unreachable. :-/ As much of an IPv6 fan-boy as I am, even I am thinking this is just a PITA. ;-) - Chris=