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When I asked my what is my static IP leases, I got the reply:


Customer WAN:

Lan IP:

May I ask What is the ISP WAN and Customer WAN?


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up vote 4 down vote accepted

Sounds something like this:

          | (mask
     | your     |
     | router/  |
     | firewall |
          | (mask
----------+-----------  your local LAN segment    (mask

The x.x.228.117 and 118 addresses are used on the link between your WAN router (or firewall or whatever it happens to be) and your ISP.

Since they've specified the range of .112-.127 for the LAN, I'm assuming that's actually the subnet. The first address of the subnet (.112) is the network address, so you can't assign it. The last address (.127) is the broadcast address, so you can't assign it either. You need to assign one of the addresses in that range to the LAN interface of your router/firewall (I've chosen .113 in the diagram). That leaves you with 13 addresses that you can actually use to assign to hosts (.114-.126).

The default gateway of your hosts would be configured as The default gateway of your router/firewall would be configured as That way the hosts know to use your router to get to the Internet, and your router knows to use your ISP to get to the Internet.

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ASCII art FTW! Party like it's 1989. – Wesley Jan 1 '11 at 6:52

The "ISP WAN" is your ISP's gateway address. It will act as the upstream gateway for your router. The "Customer WAN" is your router's external IP address. The "LAN IP" is the publicly-routable network block to assign to your hosts behind the router.

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