>>>>   2) configure the client and server to use an alternate port
>>>>
>>  From http://openvpn.net/howto.html#server:
>>
>> proto tcp #library blocks UDP
>> port 443 #library allows this port
>> comp-lzo #compression on
>> user nobody
>> group nobody
>
> Actually, I'd just need to modify the forwarding rules at the
> router.  But since you mention it, are you sure the library blocks
> UDP?  How can we verify whether the library does or doesn't?
I assumed it did. It would make sense but we would have to try it to  
make sure. netcat is good tool to have around:
http://m.nu/program/util/netcat/netcat.html
UDP would be better for the tunneling. There are known issues  
concerning TCP-over-TCP, but if that is the only option...
http://sites.inka.de/sites/bigred/devel/tcp-tcp.html

>
> Also, can OpenVPN listen on two different ports, e.g. 1194 and 443,
> at the same time?  I've looked through the options in the manpage[1],
> but don't see a clear answer whether yes or no.  This is more a
> curiosity than anything else.  I guess one could always start more
> than one server, no?
As of version 2, it can without starting multiple servers manually.  
You can also add a second /etc/openvpn/config.conf file and the  
startup script will pick it up. It is however a bad idea to do this  
with a single static key for routing reasons (there is still only one  
routing table and no way to differentiate the clients). However, you  
could use the firewall to port forward 1194->443 or vice versa.

Browsing the man page, did you notice that OpenVPN support http proxy  
tunneling as an option. I hadn't seen that before...

>> You want to do this on the eMachine, correct?
> To start with, yes.  But since the client (like the server) will be
> with Knoppix + PDI, I don't see any reason why it cannot be ported to
> any other machine with one wireless NIC and one wired NIC, for
> example, a low-end laptop.
>
>> I recommend using a firewall rule builder under Linux and tweak the
>> resulting rules as necessary.
>
> Any recommendations?  I had a look on the Knoppix CD and didn't see
> one.  But maybe I overlooked it.
http://www.fwbuilder.org/ is a big one. It also includes rule "cross- 
compilers" so that you could generate rules from your description for  
ipfw, iptables, ipchains, pf automatically. Debian has it in its apt  
repository as "fwbuilder".

Cheers,
M

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AgentM
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