On Tue, 2013-01-15 at 17:35 -0600, JB wrote:
> > On 01/15/2013 01:19 PM, JB wrote:
> > > 
> > >   It's a  TP-Link TL-WR841N Wireless N Router.

<snippage>

>   It displayed 'network unreachable'.

It may be the router configuration.

If I understand correctly all PCs are connected wirelessly.

There is an option in the router's configuration under "Wireless
Advanced":

Enabled AP Isolation - This function can isolate wireless stations on
your network from each other. Wireless devices will be able to
communicate with the Router but not with each other. To use this
function, check this box. AP Isolation is disabled by default.

If you have enabled this the PCs won't be able to see each other
regardless of how your firewalls are configured.

Regards
Graeme


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