Currently I am desinging a simple network where I'm having an external router accept the internet link (RJ45 ethernet) and then create a zone between the external router and an ASA firewall. My question is what advantages can we gain by having this external router, what would we lose if we took the internet connection straight into the ASA?
Please remember this is only for a medium sized firm >1500 employees with only a single internet connection. Possibly with a default route to our ISP.
I'm thinking of having a cisco 2851 router and a ASA 5520.
Any help would be appreciated.