cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
523
Views
0
Helpful
1
Replies

Query regarding firewall operation

mukundh86
Level 3
Level 3

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 11
Level 11

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.

Review Cisco Networking for a $25 gift card