From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Dykstra Subject: Re: IPv6 default routes timing out? Date: Thu, 30 Jul 2009 20:09:15 +0000 Message-ID: <1248984555.8639.4.camel@Maple> References: <874osv8jyo.fsf@shaolin.home.digitalvampire.org> <1248914038.13447.17.camel@merlyn> <87k51q6raq.fsf@shaolin.home.digitalvampire.org> <1248975058.7167.28.camel@Maple> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Roland Dreier , netdev@vger.kernel.org To: Roland Dreier Return-path: Received: from mail-px0-f203.google.com ([209.85.216.203]:61461 "EHLO mail-px0-f203.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750928AbZG3UJT (ORCPT ); Thu, 30 Jul 2009 16:09:19 -0400 Received: by pxi41 with SMTP id 41so500145pxi.33 for ; Thu, 30 Jul 2009 13:09:19 -0700 (PDT) In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On Thu, 2009-07-30 at 11:34 -0700, Roland Dreier wrote: > Well, I see router advertisements (and pings to ff02::1) from the router > on both of the two laptops I have handy, and then after a while the > openbsd system seems to stop broadcasting -- I no longer see the > broadcast ipv6 packets on either laptop, but if I just do "ifconfig ral0 > down; ifconfig ral0 up" on the openbsd system then everything seems to > come back. Note that these are actually multicasts, not broadcasts. There's not much difference on the sending end, but on the receiving end there's usually filtering at the NIC level that doesn't apply to broadcasts. That's why I'm a little bit suspicious of the laptop end of your connection. It's not uncommon for multicast to be broken in various ways without people noticing, because they don't use it very much on IPv4. However, it's fundamental to IPv6. -- John