Implementing a PPP/L2TP stack using Netgraph

From: Rayene Ben Rayana (rayene.benrayana_at_topnet.tn)
Date: 04/19/05

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    To: freebsd-net@freebsd.org
Date: Tue, 19 Apr 2005 14:56:12 +0200

    Hi everybody,
     
    I'm trying to connect an IPv6 streaming client to an IPv6 server through a
    GPRS connection.
     
    The client protocol stack should be like this
     
    RTP / UDP / IPv6 / PPP(client) / L2TP / UDP / IPv4 / PPP (kernel) /
    Bluetooth
     
    For the moment, I've to implement this one to test.
      
    RTP / UDP / IPv6 / PPP(client) / L2TP / UDP / IPv4 / ethernet
     
    Ooof
     
    I've read some man pages and I think that the netgraph's graph should be
    like this.
     
    ng_socket (/inet6/dgram/UDP) connected to ng_ppp (Inet)
    ng_ppp (bypass) connected to PPP daemon (???)
    ng_ppp (link1) connected to ng_l2tp (Session_0001)
    ng_l2tp (ctrl) connected to ControlEntity (???)
    ng_l2tp (lower) connected to UDP /IP (but how)
    IP connected to ng_ether (Upper)
     
    Doesn't look to be good :(
     
    Please help me. I promise to write a tutorial for the newbies if this works.
     
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