Hello,
I am new to Lwip and am trying to get the unixsim example code running. I can compile it and run it. However, when I do ‘ifconfig’ I see that the address of the tap0 device is 192.168.0.1 instead of 192.168.0.2 as described by the README and, indeed, as specified in the code:
IP4_ADDR(&gw, 192,168,0,1)
IP4_ADDR(&ipaddr, 192,168,0,2) from main() in simhost.c
I’m confused as to why the interface is coming up with 192.168.0.1 when it seems the code is setting it to 192.168.0.2
Also, I cannot ping 192.168.0.2 as described in the README.
My understanding of a tap interface is that it behaves, essentially, as a virtual Ethernet link connecting two ip addresses. So, with the above code, I would expect to see my local tap0 come up with 192.168.0.2 and be able to ping the virtual gateway at 192.168.0.1. In any case, I would expect to be able to ping both targets.
The README specifies that the tap interface must be enabled. I’m running the latest version of Fedora and I assume (though perhaps wrongly) that the tap interface is enabled since a pingable tap0 interface comes up with address 192.168.0.1. But, I haven’t been able to determine, for certain, whether the interface is, in fact, enabled. In any case, I see a /dev/net/tun file but do not see any tap devices under /dev. Does this mean that my interface is, in fact, not enabled?
I am trying to get a proof of concept up and running in which I run my companies security software on top of Lwip instead of the native stack. I’m guessing that the easiest way to do this would probably be to bring up the example code and then figure out how to modify it to run our code. Does this sound like a reasonable approach?
Thanks very much for the help.
Richard
Richard Shinn
Engineer
Mocana Corporation
350 Sansome St. Suite 1010
San Francisco, CA 94104
+1-415-617-0055 x3042
Securing the Internet of Things
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