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
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