On 09/02/2018 05:48 AM, mick crane wrote:
On 2018-09-02 13:16, Stephen P. Molnar wrote:
<snippped>
The Firewall Passthrough is set to Allocation Mode set to 'Passthrough
with the Passthrough Mode set to 'DHCPS-dynamic '.
It's my intention to change the Allocation Mode to 'Off', as soon as I
talk to AT&T Tech Support to make sure that doesn't mess things up.
I'm not quite understanding how one PC is going straight through the
router to the ISP's network whereas you have other PCs with private
addresses.
In my case as I understand it the ISP's router redirects from its
external network to internal private.
PC with say 2 NICS one to the router and one to a switch whereby
connect the local machines using PC with 2 NICS as gateway doing
DHCP, firewall and all that.
mick
https://en.wikipedia.org/wiki/Firewall_pinhole
https://en.wikipedia.org/wiki/DMZ_(computing)
https://en.wikipedia.org/wiki/DMZ_(computing)#DMZ_host
The OP appears to have the third option enabled on his gateway.