After a long in "stop" period, the internet connection (ethernet) doesn't work. before updating to mountain lion this problem didn't exist.

after a long in "stop" period, the internet connection (ethernet) doesn't work. before updating to mountain lion this problem didn't exist.

Gave up on the GUI. This script derived from http://blog.netnerds.net/2012/07/os-x-how-to-setup-nat-on-lion-and-mountain-lion / seems to work for me:
gwdev=en0 # This is my WiFi connection (has Internet connection)
targetdev=en1 # This is the USB to Ethernet adapter (to give Internet connection)
/sbin/ifconfig $targetdev down
/sbin/ifconfig bridge0 create
/sbin/ifconfig bridge0 up
/sbin/ifconfig bridge0 addm $gwdev
/sbin/ifconfig bridge0 $HOST_ADDR
/sbin/route add default -interface bridge0 -ifscope bridge0 -cloning
/usr/sbin/sysctl -w net.inet.ip.forwarding=1
/sbin/ipfw add 100 divert natd ip from any to any via $gwdev
/usr/sbin/natd -interface $gwdev -use_sockets -same_ports -unregistered_only -dynamic -clamp_mss -enable_natportmap -natportmap_interface $targetdev

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Please consider, that I have absolutely no idea of networking.

I don't know exactly how, but I got it working. I will try to explain, what I did.
1. I used the easybox as DHCP-Server an set the TC to Bridge Mode.
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While browsing, my iMac will suddenly stop communicating with the internet. AirPort, Chrome, and all Mac software are working fine, it just "forgets" how to connect. It shows everything is as it should and is still connected to my home network, but won't operate at all. The only solution is to reset from Time Machine. Anyone else have this problem?

Best way ti fix it !
iMac and MacBooks have the ( PHY Mode:    802.11n ) as standard
there not supporting 802.11g or other types
what you need to do
go About this Mac > More Info... > Overview > Than > System Report..
Than from the lest under Network - Wi-Fi
you will get report about your network Interfaces ,
your router name here :
PHY Mode:    802.11n
BSSID:    bc:76:70:5d:c6:a7
Channel:    7
Country Code:
Network Type:    Infrastructure
Security:    WPA2 Personal
Signal / Noise:    -74 dBm / -101 dBm
Transmit Rate:    52
make sure that your router setting on your router match the machine
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why is that happened ?
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agin and agin and agin .
make sure you buy good router that support 802.11n
very easy job takes me 1 year for find it and no one have the right answer on the net

After a long in "stop" period, the internet connection (ethernet) doesn't work. before updating to mountain lion this problem didn't exist.

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