[ale] OT: ICMP Tunnel

[Joseph Knapka]

Christopher Fowler <cfowler at outpostsentinel.com> writes:

> On my trp to IL and MN, I ran into 2 instances of attempting to
> get fast internet access.  In both instances, I could ping a remote
> host but could do nothing else.  When I would fire up a browser, I
> would be directed to a page prompting me to pay X amount of dollars
> for short term access.  So I had a thought of building a tunnel that
> would create a VPN back to a host running a server for that tunnel.
> 
> The idea is to use the data portion of the ICMP packet to store 
> a packet header plus data that should be redirected to a pppd 
> server running on both the client and the server.  Since ping was
> successful between the networks, This woul make it possible to 
> do a network tunnel using ICMP as the transport.  The only
> problem is that ICMP is not a reliable protocol so all the
> reliability will have to be built into the client and the
> server.

Actually, if you're going to tunnel TCP over this ICMP
transport, the TCP layer should take care of reliability,
should it not? Just as it does when using IP as the transport.

Cheers,

-- Joe

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