7.18. IP Masquerading with PORTFWing seems to break when my line is idle for long periods

If you have a DSL or Cablemodem, this behavior is unfortunately quite common. Basically your ISP is putting your connection into a very low priority queue to better service non-idle connections. The problem is that some enduser's connections will actually be taken OFFLINE until some traffic from the user's DSL/Cablemodem connection awakens the ISP's hardware.

What do I recommend to do? Ping your default gateway every 30 seconds. To do this, edit the /etc/rc.d/rc.local file and add the following to the bottom of the file:

         ping -i 30 > /dev/null &

Replace the with your default router (upstream router).