Hello Norberto, On Thu, Jan 29, 2015 at 04:42:06PM -0200, Norberto R. de Goes Jr. wrote: > Hi All. > > I have the following environment: > > - host Windows-7 Professional, 64 bits, with two virtual machines (Virtual > Box), both with Fedora-17 Distro, 32 bits; > - the VM´s network configured as "Internal Network" > > I wrote a small "lwip application" based on unix port (community). It runs > in VM #1 and a "tap0" device is created with success. In the VM#2 no > application is running. > > When I "ping" the tap0 IP from the VM#1 the reply is received, no problem. > I can see the traces reported by lwip like arp received and arp reply. But > when I "ping" the tap0 from VM#2 I have no answer. > > Faced with the situation, I followed the steps suggested by another solved > threads from this list, for instance: > - http://lists.nongnu.org/archive/html/lwip-users/2004-08/msg00006.html > - http://lists.nongnu.org/archive/html/lwip-users/2012-02/msg00021.html > Basically, the threads show how to configure a linux bridge (br0) and your > attached devices. > > But I did not get success still. The pings from VM#2 go from the ethernet > to the "br0"(VM#1) device and after to the "tap0" device. There the lwIP > generates an answer and sends it to the asking host. But then the packages > disappear. They do not go back to the "br0" device (seen with dcpdump). > > Please, are there any restriction in use the lwip library in virtual > machines hosted on the same server? More specifically with linux bridge use?
Please send the "brctl show" as well as "ip a s" and "ip r s" on both machines. Sylvain
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