From owner-freebsd-net  Wed Mar  1 12:42:15 2000
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Date: Wed, 01 Mar 2000 12:41:19 -0800
From: Julian Elischer <julian@elischer.org>
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To: Archie Cobbs <archie@whistle.com>
Cc: Alejandro Ramirez <ales@megared.net.mx>, net@freeBSD.org
Subject: Re: GRE Support in 4.X ???
References: <200003012022.MAA71299@bubba.whistle.com>
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Archie Cobbs wrote:
> 
> 
> You can do GRE in FreeBSD without any modifications simply
> by opening a raw IP socket.  This is how mpd does it (actually
> using ng_ksocket(8) to create the socket and ng_pptpgre(8) do
> do the handling of the GRE packets).

Ah that's how I was confused..
so we could add a generic GRE handling netgraph node as well,
so you could do netgraphy tricks as well.

> 
> However, really FreeBSD should have built-in support for GRE
> so you could say, eg:
> 
>   s = socket(PF_INET, SOCK_DGRAM, IPPROTO_GRE);
> 
>   sin.sin_addr = 192.168.1.1;
>   sin.sin_port = 0x883E;        // GRE protocol number
> 
>   bind(s, (struct sockaddr *)&sin, sizeof(sin));
> 
> It looks like they have done the first part (create the socket type)
> but not the second part (allow you to bind to a specific GRE protocol).
> 
> Instead, they hard code the squid protocol number 0x883E into the
> kernel, turning GRE (generic routing encapsulation) into SRE (specific
> routing encapsulation :-)
> 
> These patches would not be necessary if they just used a raw socket.
> On the other hand, we should add (complete) GRE support to FreeBSD
> anyway.


> 
> -Archie
> 

-- 
      __--_|\  Julian Elischer
     /       \ julian@elischer.org
    (   OZ    ) World tour 2000
---> X_.---._/  presently in:  Perth
            v


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