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From: Ihsan Junaidi Ibrahim <ihsan@grep.my>
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Subject: Programmatically forwarding packets to outgoing interface
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Date: Mon, 23 Sep 2013 11:55:56 +0800
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Hi folks,

I'm trying to learn building a VPN-type application on FreeBSD and I'm =
currently stuck at trying to route packets to outgoing interface.

I've managed to push/pop IP packets in a tun(4) interface but now that I =
can read the inner packet header, I need to route the payload out of the =
box. I'm not quite sure which API I need to use to achieve this.

The inner packets can be of either IPv4 or IPv6.

Thanks.=