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Query regarding firewall operation

mukundh86
Level 1
Level 1

I have a basic question as to how a firewall works.

Say there is a server in the DMZ zone with a private IP of 10.11.1.4  and it is statically NATTed by the firewall to a public IP of 100.11.1.4. Now when a packet with the destination of 100.11.1.4 hits the firewall does it get translated back to its private IP ie 10.11.1.4? What happens if the firewall has a static route to a network 100.11.1.0/24 ( of which 100.11.1.4 is a part of) pointing to another IP? Does the packet reach 10.11.1.4 or gets routed to the next hop IP defined by static route?

1 Reply 1

Roman Rodichev
Level 7
Level 7

when packets come in from outside, first happens NAT, then routing. Therefore it would be translated first, and only then routed to the translated IP.

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