On Sat, 29 May 2010, j.chitte wrote:
> --- In Jim Jackson <> wrote:
>> On Thu, 27 May 2010, j.chitte wrote:
....snip.....
>>>
>>> Any suggestions on how I can diagnose what's wrong.
>>
>> If your SBC is in the same subnet as the desktop, then you probably don't
>> want to be NAT to it from the desktop - that would be 2 NATs and one trying
>> to NAT within a subnet. Not a situation I'd want to debug.
>>
>> If you really must send the traffic to the desktop first, you need to run
>> a TCP redirector of somesort on the desktop. This works at the TCP layer
>> not the network layer and can be a lot easier to set up.
>>
>> This is one such
>>
>> http://sammy.net/~sammy/hacks/redir-2.2.1.tar.gz
>>
>> I've used one of these sorts of programs before, a long time ago. It was
>> easy to setup.
>>
>
> Hi Jim, thanks for the reply.
>
> I should have more fully explained the topography.
>
> The router is next door with a wifi link on the desktop machine. The SBC
> is , of course, on a different subnet.
Ok my bad.
You could of course just have a routing problem. Does the router have a
route pointing to the desktop for SBC network? Stuff might getting out, but
without full routing back, packets will be dropped.
> I will get the SBC connected with wifi later this was supposed to be a
> "quick" solution to get it connected.
>
> I'll look into the TCP solution you suggested but I would have thought
> this was exactly the sort of thing that iptables NAT can do. I'm probably
> overlooking something obvious.
There is of course more than one way of doing things :-)
My experience, speaking as a retired networking engineer, is that messing
with IPtables (other than following recipes) takes real low level
networking knowledge and has loads of gotchas, where as setting up TCP
redirectors etc is a bit easier to understand and less error prone.
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