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    SubjectRe: TUN/TAP hacking
    Ignacy Gawedzki wrote:
    > I need some advice from network stack experts, so I hope this is the right
    > place to ask.

    The Linux kernel networking folks hang out at netdev
    (netdev@vger.kernel.org). I've CC'd them...

    > I thought I'd be able to use the TAP interfaces to create some sort of a
    > network emulator. For a start I just "bridged" two tap interfaces, much in
    > the same way as the example of br_select.c from http://vtun.sf.net , assigned
    > both interfaces different IPv4 addresses (both with a /32 prefix), set them up
    > and tried to transmit a UDP packet from one address to the other through the
    > bridge. Both logs from my bridge program and tcpdump tell me that the packets
    > are flowing as expected, but somehow the destination process doesn't get the
    > packets (despite all correct bind, etc).
    >
    > Is it simply that the stack inconditionally drops any packet with the same
    > source (IP and/or MAC) address as some local interface?
    >
    > As ARP resolution seems not to work either (I had to put permanent entries in
    > the neighbor table), I suppose this is the case indeed.
    >
    > Could anyone confirm that? (please CC me, I've not subscribed)
    >
    > Thanks,
    >
    > Ignacy
    >


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