On 26/08/2010 23:40, Stephen Hemminger wrote: > On Thu, 26 Aug 2010 23:00:07 +0200 > Nicolas de Pesloüan<nicolas.2p.deb...@free.fr> wrote: > >> Le 26/08/2010 21:38, Nicolas de Pesloüan a écrit : >>> Le 25/08/2010 23:49, François Schmidts a écrit : >>>> On 25/08/2010 22:39, Stephen Hemminger wrote: >>>>> On Wed, 25 Aug 2010 21:43:11 +0200 >>>>> Nicolas de Pesloüan<nicolas.2p.deb...@free.fr> wrote: >>>>> >>>>>> Le 25/08/2010 16:51, François Schmidts a écrit : >>>>>>> Hi, >>>>>>> >>>>>>> I'm using bridge-utils to add a bunch of tap interfaces to my computer >>>>>>> so I can run different qemu vm at the same time without using nat to >>>>>>> give them network access. It works fine. >>>>>>> >>>>>>> But at the same time I would like to add a lot of IPv6s addresses to the >>>>>>> bridge interface (br0). I find myself limitated to more or less 56 >>>>>>> addresses. If I add one more, one of the addresses already existing just >>>>>>> disappear from the br0 interface. >>>>>>> >>>>>>> Is there something I could do to remove or extent this limitation ? >>>>>> Did you try the same IPv6 configuration on a normal ethernet NIC ? Do >>>>>> you think this is a bridge >>>>>> only related problem ? >>>>>> >>>>> Also what tools are you using? Don't use ifconfig (iputils) for IPv6; >>>>> only ip command (iproute2) works correctly with multiple addresses. >>>> I use something like "ip addr add<prefix>::number/64 dev br0" in a loop >>>> to add quickly multiple addresses to the bridge. >>>> As far as I have tested it on classic interfaces like eth0, it works >>>> fine and I can see my 200 addresses (if I added 200 of them) in the >>>> output of ifconfig. >>> I just tested on a 2.6.32 kernel, and get the following results : >>> >>> Whatever interface I use (bridge or normal Ethernet interface), I'm able to >>> add 200 IPv6 address. >>> >>> "ifconfig" display all the IPv6 address on the interface. >>> "ip addr show" only display about 53 of them. >>> >>> Can you try and ping the 200 IPv6 address from another host, to know >>> whether this is a real IP >>> problem or only a display bug. It might be an iproute2 bug on the addr show >>> part. >> Another test showed that one can ping the 200 addresses. So this really look >> like an iproute2 or >> netlink problem, and unrelated to bridge. >> > I just put 2000 addresses onto dummy device and the all show up > with ip addr. Do you have old tools, the issue is likely the size > of the buffer in netlink interface between ip command and kernel. > Current version has 16K buffer, but it could easily be increased. Thanks for all your answers.
I tested all of this all over again and I couldn't recreate the bug, neither on my local machine or on the distant dev server I use for test and where the limitation showed up the first time. I added 2000 addresses on both which were reachable to ping without difficulties. The problem may have come from a display bug from the tool I used then to list IP addresses. Sorry to have bothered you with an "nonexistent" bug and thanks again. _______________________________________________ Bridge mailing list Bridge@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/bridge
