On Sat, 29 May 2010, Jim Jackson wrote:
> 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.
Ok my bad again, NAT at the desktop, yes, yes. In mitigation I plead
serious head cold symptoms.
>> 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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