PingPong Example for the LWIP

[Christian Helmuth]

Hej,

On Wed, Mar 26, 2014 at 10:34:38PM +0100, Christian Prochaska wrote:
> When I just tried the test after commenting out these synchronization parts, the client showed the following error message:
> 
> "[init -> nic_drv] could not configure /dev/net/tun: no virtual network emulation"
> 
> This error message only occurred when the server was running, so it appears that it is not possible to have two instances of
> 'nic_drv' running at the same time on the same Linux host.

The issue is in os/src/drivers/nic/linux/main.cc:84

  Genode::strncpy(ifr.ifr_name, "tap0", sizeof(ifr.ifr_name));

This means any instance of the base-linux nic_drv tries to configure
its tap device with name "tap0" which is denied by the Linux kernel.
We could add an optional config option for the tap-device name to
support scenarios with several instances of nic_drv on Linux.

Greets
-- 
Christian Helmuth
Genode Labs

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