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send udp replies from the ip alias they have been received
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if you have a box with some virtual/cluster/alias ips,
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currently a udp request received on the alias ip will be
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answered using the primary ip.
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this patch uses the linux IP_PKTINFO socket option to
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be able to send back replies with the same source ip
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the corresponding request has been received on.
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Update from Jan Andres <jandres@gmx.net>