A customer has a Cradlepoint with cellular backup in front of his actual
firewall. He believes the public IP lives on the firewall, but somehow
the Cradlepoint is monitoring internet connectivity and will switch to
cellular automatically.....he believes it doesn't need a separate IP
address to do this.
In this case we're doing DHCP with a reservation for a public IP.
Anybody without a reservation is getting a private IP. He initially
plugged everything in and got a private IP, then we made the
reservation, but then we saw two ARP entries for the same MAC address.
One on the private IP and one on the public IP. both were active, it
wasn't like an expiring ARP entry.
Does cradlepoint monitor the DHCP transaction between us and the
firewall and clone the WAN mac of the firewall? Then what, use ARP to
verify the gateway is up? I've never used these things, I'm just trying
to understand how they work.
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