Router & Firewall Operation

Unanswered Question
Feb 14th, 2007

Can someone tell me exactly how a router and firewall work in this example.

Router connects to internet

Firewall connects to router

Router has IP range

Firewall outside interface is

Firewall also has some Nat policies for some IPs that translate to internal IPs

Now my question is does the Router send Arp requests to the firewall and does the firewall respond? Does the firewall check its NAT table ? How does this oepration work, anyone can explain ?

I have this problem too.
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