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Again, remember to save. Fortunately if you attempt to navigate away or close the window without saving, it will let you know again that changes are not saved.
LAN 1 and LAN 2
If both of your ethernet ports are being used, you will need to apply these settings to both ethernet cards. On the tab level on the far right side you'll see a pull down menu. Select LAN 1 or LAN 2 to configure the appropriate ethernet port.