On Thu, 4 Aug 2005 05:37:05 -0700 (PDT) Zoran s <s_zoran@xxxxxxxxx> wrote: > Hi, > > I am writing this email in sincere hope that somebody > experienced similar/same problem and found solution to > it. > > The classical bridge setup could be achieved using > brctl tool, which could be found at: > http://home.regit.org/br2684.html > > I have an ADSL CO line card Linux based [2.4.24 > kernel] with 8 nas interfaces and eth0. Rather than > having bridge, the decision was to have a router, > which does routing functionality between nasx > interfaces and eth0. > > >From user space, setting up a bridge connection is > quite simple. First, the linking an ATM VC with an > interface should be done followed by configuring this > interface. > > The syntax of the command is the following: > > br2684ctl [-c n -e 0|1 -b 0|1 -s buf_size -a > [itf].vpi.vci ]+ > > -a [itf].vpi.vci : ATM PVC number, VPI and VCI. > Mandatory > -c n : BR2684 interface number such as > nas0, > nas1,... Mandatory > -e 0|1 : Encapsulation method. 0=LLC, 1=VC > mux. > default is 0, LLC > -b 0|1 : Running background. 1=background, > 0=foreground. Default is 0 > -s buf_size : send buffer size. Default is 8192. > > The problem with setting bridge with brctl tool is > lack of option p 0|1 [bridged or routed > functionality]. I'm using more advanced tool based on > brctl with additional option p: > > -p 0|1 : Bridged or routed. 0=routed, > 1=bridged > Default is 0 [routed]. > > In other words using ADSL CO line card as IP router > makes every nasx and eth0 interfaces to have their own > IP addresses. The example of setting a nas0 interface: > > br2684ctl -b -c 0 -e 0 -p 0 -a 0.0.40, where p is used > as Routed mode option. > > When there is need to configure a WAN connection on > CPE side [ADSL modem on other side of twisted pair], > there are 5 possible options for WAN connection > creation: > > [1] RFC1483 Bridge > [2] RFC1483 Route > [3] PPP over ATM > [4] PPP over Ethernet > [5] IP over ATM [CLIP] > > Choosing option 2 [RFC1483 Route] as an option follows > usage of brctl tool for nas0 interface creation on CO > side in routed mode. > > The actual problem is that routed mode does NOT work > after setting the parameters as shown [CPE modem > receives packets on WAN, but discards them, finding > them as bad]. > > The problem is solved by creating [on CO side] nasx > interfaces in bridged mode. As example, the nas0 > interface creation syntax looks a bit different: > > br2684ctl -b -c 0 -e 0 -p 1 -a 0.0.40, where -p is > used as Bridged mode option. > > On other [CPE] side, the option 1 is used [RFC1483 > Bridge (with NAT)] for creating the WAN interface. > This works perfectly, albeit both CO and CPE sides are > set as routers! > > Any ideas why RFC1483 Route mode does NOT work? I'll > apprecate any ideas which can show me some direction. > > Best Regards, > > This list is about the IEEE 802 based bridging and your questions is about ATM based bridging. Perhaps you should ask on the ATM list linux-atm-general@xxxxxxxxxxxxxxxxxxxxx Also see: http://home.regit.org/br2684.html
