First I can connect several PCs to a router, then connect this router to an ADSL modem, and finally via this model (which is connected to an local ISP), all the PCs on the LAN can access to the internet;
Now, let's do this with a firewall, i.e., connect several PCs to a Firewall, then connect this Firewall to an ADSL modem, and finally via this model (which is connected to an local ISP), all the PCs on the LAN can access to the internet, too.
So, my question is when should we use the router and when to use firewall?
Especially, nowadays, a router contains "some" firewall inside, while a firewall also contains "some" router inside.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...