[TriEmbed] Raspberry Pi as WIFI client providing DHCP link to Internet via its wired ethernet

[Pete Soper]

Hi Brian,

On 03/22/2018 10:17 AM, Brian via TriEmbed wrote:
> This really couldn't be easier, and I've done it myself a time or 
> three.  Configuring a Pi as a router isn't any different than doing it 
> on any other Linux machine:
>
> - iptables for firewalling & NAT
This RPI will have exactly one function: shipping packets to/from the 
downstream router to an upstream WIFI router. What I'd be walling 
against, let alone NATing is mysterious.
> - dnsmasq for DHCP and DNS caching
Ditto for the caching. And I actually under-specified this. The ethernet 
port doesn't need to provide DHCP to the downstream router (that feeds 
the lab's clients with its WIFI). A static IP would be fine. So this can 
be even easier than I portrayed it. :-)
> - wpasupplicant for WiFi client config
Yep. But, as they say, "it's all in the wrist". I thought this would be 
easy too.
>
> I could assist personally on Saturday, if no one else has already 
> stepped up sooner.
Done! We can follow up off the list.

Best to all,
Pete

>
> Cheers,
> -B
>
> On 03/22/2018 10:05 AM, Pete Soper via TriEmbed wrote:
>> I have a specific application need where a model 3 RPI needs to connect
>> to a WIFI network as a client but provide one DHCP link via its wired
>> ethernet port to a router WAN port so clients of that router can get to
>> the Internet. If somebody has direct experience with this very specific
>> scenario and has of a recipe that you know for a fact works, please
>> point me to it. I know I'm being a choosing beggar here, but there are a
>> number of recipes that only look like they apply to my use case and I'm
>> tired of the rat holes. I have a kludge in place now using my microscope
>> imaging laptop with Windows ICS and I need to get the laptop back to my
>> shop, so this has become a priority.
>>
>> If somebody who considers this a piece of cake would like to see the new
>> community laboratory hosting the Triangle DIY Biology organization in
>> Durham and help me make this bridge work I'd appreciate it. (After
>> renovation this will likely be the future home of Splatspace, by the
>> way). The lab is at #24 Shoppers Street, Durham, NC 27707, across the
>> parking lot from Scrap Exchange. I'll be there and available from 1-4pm
>> today and 2-4pm Saturday. If you just want to come by and see the place,
>> "all are welcome", most especially if you like playing with friendly
>> kids interested in learning stuff.
>>
>> Thanks,
>> Pete
>>
>>
>>
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