On Thu, 21 Dec 2006 13:50:31 +0000 "Jie Chen" <cj70286 at hotmail.com> wrote: > Thank you, Stephen. > > > I'm reading the codes. The software uses ioctl a lot. I'm new to ioctl, is > it an interface between register values of the ethernet card and user > application? > > > We use ioctl to add a bridge, add an interface to the bridge, which ioctl > file do we use for that? I greped the whole file system of my linux box, I > found some ioctl files, but when I try to match the cases (The second > parameter such as SIOCSIFBR, SIOCBRADDBR) it handles, it seems none of those > files match our cases. Download bridge-utilities source code: http://sourceforge.net/project/showfiles.php?group_id=26089 And look at libbridge code there. > > Another question I had is about my understanding on ioctl. Since I think > ioctl is just to set physical register values of ethernet cards, once it's > set, all the functions should be automatic, when packets come, the bridge > automatically routes, is Kernel involved in those functions? The architecture is more like: Applications | brctl | +-------+ user | ----------------------------|----------------- kernel | +----------------+ | Bridge | | driver | +----------------+ | | +--------+ +--------+ |Ethernet| |Ethernet| | Driver | | Driver | +--|-----+ +----|---+ -----------|-----------------------|--------- physical LAN1 LAN2 > About STP, seems like everything is set by a function br_set, and eventually > by ioctl. Is there any daemon to maintain STP? No. But the long term plan is to do STP in userspace with a daemon since that allows for more flexibility > > Thanks again for your valuable time. > Jie > > >From: Stephen Hemminger <shemminger at osdl.org> > >To: "Jie Chen" <cj70286 at hotmail.com> > >CC: bridge at lists.osdl.org > >Subject: Re: [Bridge] Monitor the status of two ethernet interface > >Date: Wed, 20 Dec 2006 14:32:09 -0800 > > > >On Wed, 20 Dec 2006 21:26:18 +0000 > >"Jie Chen" <cj70286 at hotmail.com> wrote: > > > > > Hi everybody, > > > > > > Just have myself added into the maillist. I have a few linux boxes with > > > Kernel 2.6.9. Each box has 2 ethernet interfaces, one 3COM, one Intel. I > > > connected one with Power Line Modem, and one with Wifi Modem. They form > >a > > > nice network with bridge. I have a few questions here. > > > > > > Suppose I have two path from box A to box D, which path will packets go > > > through? If I want to monitor the condition (throughput) of each > >interface, > > > and pick the better one, how do I do it? If I want to use both > >interfaces to > > > transfer data, how do I do it? > > > >With STP it will choose the "least cost" which is determined by the port > >cost variable. In 2.6, it automatically sets the cost based on link speed. > >but > >then you can change it later with brctl > > > > > > > > Thanks in advance for your answers, > > > cj > > > > > > _________________________________________________________________ > > > Type your favorite song. Get a customized station. Try MSN Radio > >powered > > > by Pandora. http://radio.msn.com/?icid=T002MSN03A07001 > > > > > _________________________________________________________________ > Get FREE Web site and company branded e-mail from Microsoft Office Live > http://clk.atdmt.com/MRT/go/mcrssaub0050001411mrt/direct/01/ >
