Re: tunneling in linux (was: Re: [PATCH][RFC] etherip: Ethernet-in-IPv4 tunneling)

[Pekka Savola <pekkas@xxxxxxxxxx>]

On Sun, 16 Jan 2005, Lennert Buytenhek wrote:
> If we do end up using GRE for ethernet tunneling, there's some work that
> needs to be done.  For one, ip_gre in its current form would need a certain
> amount of hacking for tunneling ethernet frames instead of IPv4/IPv6 as
> it does now.  We might as rename it to plain 'gre' and move it out of
> net/ipv4/ to net/core/ or something while we're at it.

Now that I think about this a bit more, there may be a potential 
issue..

If the payload of GRE is an ethernet frame, which GRE 'Protocol Type' 
(i.e., ethertype) would that be?

I doubt anyone has defined an ethertype which would be used to 
transmit full ethernet frames inside an ethernet header, so this would 
likely need to be some special value..

http://www.iana.org/assignments/ethernet-numbers

(Another solution for this problem space is obviously L2TP, which is 
also rather widely supported..)

--
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings