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 From:  Chris Buechler <cbuechler at gmail dot com>
 To:  Paul Vaughan <pvaughan at san dot rr dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Two IP address for WAN
 Date:  Wed, 23 Mar 2005 18:13:29 -0500
On Wed, 23 Mar 2005 14:55:09 -0800, Paul Vaughan <pvaughan at san dot rr dot com> wrote:
> Two IP address for WAN
> My Internet ISP is my cable company.  So, i connect through a cable
> modem.  I setup a m0n0wall firewall behind the cable modem.  I gets it's
> IP address via DHCP.  When I go to the webGUI Configuration page under
> Status|Interfaces it lists the WAN interface as indicated below:
> Status                up
> MAC address   00:xx:xx:xx:xx:xx
> IP address         XX.YY.ZZZ.153
> Subnet mask
> Gateway            XX.YY.ZZZ.1
> Why the two addresses?  Gateway and IP.

The IP is your public IP, the gateway is its default gateway, i.e. the
ISP's router.

> I can ping the gateway from outside the LAN but can't ping the IP
> address.  What gives?
m0n0wall blocks ICMP by default so your WAN IP won't respond to pings.
 Typically ISP's won't drop it on their routers.