We have had the same thing on expensive switches, something to note is in our experience they are the same switches that PPPoE won't work through.
-----Original Message----- From: Jeroen Massar [mailto:[email protected]] Sent: Tuesday, 23 December 2008 3:04 a.m. To: Pascal Hambourg Cc: [email protected] Subject: Re: 6to4 tunnel trouble Pascal Hambourg wrote: > Jeroen Massar a écrit : >> Martin List-Petersen wrote: >> [..] >>> your switches are layer2, tcp/ip (be it v4 or v6) goes on top of >>> that and your switches wouldn't know the difference. >> >> Unfortunately that is not really the case. Especially when it comes >> to handling multicast there are certain (not many though) switches >> that do not properly handle multicast, as such all IPv6 Neighbor >> Discovery goes bad. Sometimes it does work at one point and then >> fails at another. This happened to several 'expensive' switches and also to >> cheap ones. > > Don't cheap "dumb" switches to handle multicast as broadcast ? That is one solution, and in that case multicast could work. The but here is that some switches only handle a subset of the MAC addresses which are meant for multicast purposes and as IPv6 uses a different range than the standard set, some of these setups break. >> Generally putting an interface in PROMISC handles the problem >> partially, but that is something one wants to avoid of course. > > I knew about the promisc trick as a workaround with broken ethernet > NICs or drivers, but how could it help when the switch is broken ? It helped in some cases I have encountered, don't know exactly why though; replacing the hardware in question is generally the best solution depending on what one wants to achieve. Greets, Jeroen -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
