This sounds like a bad idea - just wanting to get yourself in trouble. 
Let's take a step back, what are you trying to do from the tablet that 
you need open ports to the world for? Have you considered using a remote 
access system like Anydesk that uses a cloud connection broker of sorts 
so the host and client both call out to a cloud server to set up the 
direct connection so neither computing device you use needs ports open?

James Pulver
CLASSE Computer Group
Cornell University

On 03/30/2017 02:53 PM, Brown, Christopher A wrote:
> Hi list users,
>
> I am not a network administrator and know only a little bit about the
> topic. I need to set up a switch in my lab, so that I can have a wifi
> access point and an SL7 desktop computer on the same network, as I need
> to be able to connect to the pc using a tablet. My administrator does
> not allow switches to be on the network, so I need two network adapters
> on my desktop, one for internet, and on on the local switch.
>
> I tried a nominal setup at home first, with my home wifi access point,
> router/switch and using only a single adapter. I managed to open the
> required ports using firewalld, and my setup works great at home, where
> I can connect a tablet over wifi and access my desktop as I need. The
> only problem I see there is that the ports I opened are open to the
> world, but since that was temporary for testing, it was fine. They are
> now closed.
>
> I bought a usb ethernet adapter, which shows up as a network interface
> on my lab computer. I now need to configure my lab computer as follows.
> I would like the onboard network adapter to be the default (used for web
> browsing etc), and use default settings (public zone, etc). And I would
> like the new usb network adapter to have the required ports open, so
> that I can access that computer over wifi with my local switch.
>
> As I said, I have used firewall-cmd to open and close ports. I know a
> little bit, but not enough to accomplish what I describe above.
>
> Can anyone help with this? Just let me know if more information is needed.
>
> Thanks,
> Chris
>