From nobody Mon Apr 25 04:42:40 2022 X-Original-To: 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 C93A61A9A0A5 for ; Mon, 25 Apr 2022 04:42:41 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (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 "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4KmsnY3pk1z4jMl for ; Mon, 25 Apr 2022 04:42:41 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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 did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 5574B143C1 for ; Mon, 25 Apr 2022 04:42:41 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id 23P4gfqs051338 for ; Mon, 25 Apr 2022 04:42:41 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id 23P4gfUJ051337 for net@FreeBSD.org; Mon, 25 Apr 2022 04:42:41 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 263288] IPv6 system not responding to Neighbor Solicitation Date: Mon, 25 Apr 2022 04:42:40 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 13.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: zlei.huang@gmail.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: net@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated 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 ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1650861761; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YoKK29pl9KtI1yPeGpWm15tRJ5TK1jxJlRNUzGlYLYM=; b=vTEeYOLDPgpPAc0tcIgFdetlJpJ6IJ3biGqrX2r72irmj/cqQvLYLM0eu/a1z/LZABeS5k sF9/Ob9fLbb68A6T8BNSY8yomhHYknD7OqPSu+Qze2r/SkeTIdljXqPSfnp1gKdJpSUsrg 4A80hHvDf8Xd/5ZqDV7IwkkWWF91aFlhhg/vRCrG8Ynue1kR7lHyj4js4wBsErqNc4dgcV B0mAHG/Ptev9MgCk1AMSrcsaFKpbKEOpifx07TEYo4dO3nWk0Um5jXTKAfBxRcwL1JInjh PBV+EMehmMAKSDS3oKatn7q2lCjjrlCb8Dieh5hamkamV3EPZRenfh/9bcjD6g== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1650861761; a=rsa-sha256; cv=none; b=ifcU5AlTmv/Djx7jOJO5z7Q9SBno5ojqwK5yOYVUscBmYtlT3k3+tHkLVYsJvx9mnhzZv/ ypFnxifPERtM6BHbn39F/1l6u1uBZD2MaHfyMmXaACU/cAUEkmwqZ9QEtNGKeLd9XTLGxu r1LiIGYncY3c8UpeM9alraHK7FxDp+IIHKPIOb9tdnqlIprZzlolRm6vbE4D1DwodslSwa PVk0vwK8dvrrKO8HjlWHlnBI+U1K7aLG5HloqV+BJ2qQcUJ6jAV03tQL6oyFzpT8VCD9kW tYA2MvpA6IieAhXTHfXqZzuGuZst3ddQ5Kr820Xc0pw6q7TEcupv1UUqnd3OPg== ARC-Authentication-Results: i=1; mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D263288 --- Comment #16 from Zhenlei Huang --- (In reply to wcarson.bugzilla from comment #15) From the pcap you provided, I see your upstream router is advertising prefix without the 'on-link' flag. It is basically same as my testing environment = #12 except that your provider utilize HSRP to achieve first hop router failover. I can confirm CentOS 8 work greatly with such case. It seems Linux is not affected by CVE-2008-2476. The problem is a little complicated. If it is a good practice for network a= dmin to advertise IPv6 prefix without 'on-link' flag, I think the problem will be common eventually. As `net.inet6.icmp6.nd6_onlink_ns_rfc4861` has some side effect, I wonder if there is better solution to resolve CVE-2008-2476. The problem affects 12.3, 13.0, 13.1-RC4, stable/13 and current. To work ar= ound it, set 'net.inet6.icmp6.nd6_onlink_ns_rfc4861' to none-zero. As IPv6 addresses is sufficient, most cloud providers provide at least a si= ngle dedicated /64 block to the customer. In this case I think CVE-2008-2476 cou= ld not happen, thus it is safe for providers to advertise prefixes with 'on-li= nk' flag, or for FreeBSD users to change `net.inet6.icmp6.nd6_onlink_ns_rfc4861= ` to none-zero. @wcarson.bugzilla you can contact your provider to confirm if the prefix 2600:3c00::/64 is dedicated for your host. --=20 You are receiving this mail because: You are the assignee for the bug.=