Thanks! I was afraid this was the reason ... :( I actually tried writing an application that would open /dev/tap4 as a file and do a select() on it. The select() timed out when I tried pinging over the bridge, but I guess I'll have to go back and debug it, I must have missed something. --- "Eble, Dan" <DanE@xxxxxxxxxx> wrote: > The bridge is designed to do the opposite of what > you are trying to do. It > takes incoming frames and copies them out other > interfaces. You want to > take outgoing frames and copy them into other > interfaces. > > I have not played with tun/tap myself, but the > kernel documentation in > Documentation/networking/tuntap.txt seems to > indicate that you need a > program to listen on two opened /dev/net/tun devices > and copy the frames > from one to the other. > > > -----Original Message----- > > From: Derek Smalls [mailto:dsmalls321@xxxxxxxxx] > > Sent: Wednesday, June 16, 2004 12:04 AM > > To: bridge@xxxxxxxxxxxxxx > > Subject: [Bridge] Bridging between user processes > > > > > > Hi, > > > > What is the easiest way to bridge between two > > user-space processes that talk directly to > Ethernet > > interfaces? > > > > I have two applications that write/read Ethernet > > frames to/from Linux Ethernet ports (e.g. eth0). > The > > applications can successfully talk to each other > when > > they run on two machines connected over Ethernet. > I > > would like to be able to test them on a single > machine > > without employing the physical network. Would TAP > + > > bridging do the job? > > > > If so, what am I doing wrong? Linux 2.4.20, root > > user. I set up tap interfaces like this: > > > > >tunctl tap4 > > >ifconfig tap4 4.4.4.4 promisc up > > >tunctl tap5 > > >ifconfig tap5 5.5.5.5 promisc up > > > > I then set up the bridge and add the tap > interfaces to > > it: > > > > >brctl addbr tapbr > > >brctl setfd tapbr 0 > > >brctl sethello tapbr 0 > > >brctl stp tapbr off > > >ifconfig tapbr 7.7.7.7 netmask 255.255.255.0 up > > >brctl addif tapbr tap4 > > >brctl addif tapbr tap5 > > > > I then do a ping over tap4: > > >ping -I tap4 8.8.8.8 > > > > and tcpdump on tap5: > > >tcpdump -i tap5 > > > > and see nothing. Shouldn't I see the ping requests > on > > tap5 now? > > > > BTW, if I enable STP on the bridge I start seeing > the > > STP frames on tap5. > > > > Thanks! > > > > Derek > > > > > > > > > > > > __________________________________ > > Do you Yahoo!? > > New and Improved Yahoo! Mail - Send 10MB messages! > > http://promotions.yahoo.com/new_mail > > > ===== __________________________________ Do you Yahoo!? Yahoo! Mail is new and improved - Check it out! http://promotions.yahoo.com/new_mail
