I came across a good tip the other day that was very helpful during a small site firewall migration. Here’s the back story:
I was migrating a small single-site customer that had, up to this point, been using a FIOS-provided consumer-type router/firewall/access point to some Cisco gear including an ASA firewall for better firewall/VPN capabilities. This is fairly common with small businesses that start out with essentially consumer-style connectivity and finally begin to grow to a point of needing business-grade capabilities. My preparation went fine, and when the time came I swapped the ASA firewall in place of the FIOS-provided one. Then everything broke.
I ran into an unexpected issue the other day that kept me scratching my head for a few minutes when a new ASA refused to take a code upgrade. Read on for the details.
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