From nobody Sat Dec 4 16:34:32 2021 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 4AD8D18C7452 for ; Sat, 4 Dec 2021 16:34:38 +0000 (UTC) (envelope-from bz@freebsd.org) Received: from smtp.freebsd.org (smtp.freebsd.org [IPv6:2610:1c1:1:606c::24b:4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "smtp.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4J5wJZ0v2Rz4bM6; Sat, 4 Dec 2021 16:34:38 +0000 (UTC) (envelope-from bz@freebsd.org) Received: from mx1.sbone.de (cross.sbone.de [195.201.62.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mx1.sbone.de", Issuer "SBone.DE" (not verified)) (Authenticated sender: bz/mail) by smtp.freebsd.org (Postfix) with ESMTPSA id D93A7263EA; Sat, 4 Dec 2021 16:34:37 +0000 (UTC) (envelope-from bz@freebsd.org) Received: from mail.sbone.de (mail.sbone.de [IPv6:fde9:577b:c1a9:31::2013:587]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by mx1.sbone.de (Postfix) with ESMTPS id 17D3A8D4A129; Sat, 4 Dec 2021 16:34:35 +0000 (UTC) Received: from content-filter.sbone.de (content-filter.sbone.de [IPv6:fde9:577b:c1a9:31::2013:2742]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.sbone.de (Postfix) with ESMTPS id 12ED1E707AE; Sat, 4 Dec 2021 16:34:35 +0000 (UTC) X-Virus-Scanned: amavisd-new at sbone.de Received: from mail.sbone.de ([IPv6:fde9:577b:c1a9:31::2013:587]) by content-filter.sbone.de (content-filter.sbone.de [fde9:577b:c1a9:31::2013:2742]) (amavisd-new, port 10024) with ESMTP id 2cV8l8PO23t3; Sat, 4 Dec 2021 16:34:33 +0000 (UTC) Received: from nv.sbone.de (nv.sbone.de [IPv6:fde9:577b:c1a9:31::2013:138]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.sbone.de (Postfix) with ESMTPSA id A58C0E707AD; Sat, 4 Dec 2021 16:34:33 +0000 (UTC) Date: Sat, 4 Dec 2021 16:34:32 +0000 (UTC) From: "Bjoern A. Zeeb" To: Kurt Jaeger cc: freebsd-net@freebsd.org Subject: Re: why multi-hop icmp redirects to 0.0.0.0 on 13.0 ? In-Reply-To: Message-ID: References: X-OpenPGP-Key-Id: 0x14003F198FEFA3E77207EE8D2B58B8F83CCF1842 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 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1638635678; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ber++C7E+6A5gSDUHccJ7kMz3luguQBWmckRD+Sc5eY=; b=XCV5iZA3tqsGI5OB7ny3k/pH31fw4EXYjZZ4sDKKB2UtjMvb14rJtduSnMrokODnHJm9ph Yk2NJLIUFigh/hkN41pVBmjvCFhh7nRe9i6Z0/Nk5yhVzFtgVuUzhIGFGQK4HZxE6g4vab F0Vblaeh2lNTHFjcC5yaTa/WvdoSaqPu5b/9GNLBp6AdRjT5GHpPYXCK88NxTRacy+zlS5 CXSHYzbmB91lS2t5Mo6WvY39l3a+cXdLq7yYRPfRAF/nGBbJhh0B6aa56na28BbnX8CiDS 26NucVVhxTSTHpYMGtwOr+YLWOAXjV+g3h2KZYeUi8KpE4VUwcGKByQPuAJRBA== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1638635678; a=rsa-sha256; cv=none; b=D4k/Z6vDolhRoytkrk2kc9noLgUsVC/V9KJiUEvEIsRKrTb8aL6bcN8ptVkuhMui4PufZl fd5mlU0rtfyvpalm/55Fm5zzvPTmZrLEfT/kfDvpEemspV4s5bbNOxhMvOQNtJTleAy7ff G7897Xz4R/5B8sdMSKDRzJxV4Wn7o8TN52Y7rhtgLsznT4BgLfH4OSXZOraXm5DmDZEoQ9 2aiXAnrtlaaSF7m9AZwPCbu12KMuul1JQEalRbJpj7HQ3qwZjHFRFVAZQpp+RFVPhR0Z91 Wlnu3cIURwJekllGuZZzboYLO5VrxgdOuYp9BNUPP1CzQayCyKHSaocQgq77cA== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N On Sat, 4 Dec 2021, Kurt Jaeger wrote: > Hi! > >>> 10:20:16.889185 IP x.x.x..1 > y.y.y.1: ICMP redirect z.z.z.z to host 0.0.0.0, length 48 >> >> whoops. > >>> This has been stopped by net.inet.ip.redirect=0 on rtr1, but my question is: >>> >>> Why is rtr1 sending those multi-hop icmp redirects at all ? >> >> Could you elaborate on: > >> (a) Do rtr1 or rtr2 have a default route or are they carrying a full DFZ >> without default route? > > rtr1 runs frr, has full route, either with or without default route. If that makes no difference then something else is wrong. > rtr2 has only static routes, default points to rtr1. > >> Assumption: if both rtr2 and rtr1 are running 13 and not 12, rtr2 >> does have a default route and rtr1 has a full DFZ only and no >> default route? > > Seeo above. > >> (b) At the time this happens does rtr1 have a route to z.z.z.z ? >> route -4 get z.z.z.z > > Yes. And that is not pointing back to the interface rtr2 is on but out on an interface towards inet? /bz -- Bjoern A. Zeeb r15:7