If your company has invested in Cisco, you have several options for enabling various firewall-like security features without redesigns or additional purchases.
Read More »AAA on the Cisco ASA
From my experience as a Network Security Engineer, I have worked on many Cisco projects involving AAA on the routers but not so many that involve AAA on the Cisco ASA. I find that a bit weird considering that the Cisco ASA is the real security device. I wonder if …
Read More »NAT on Cisco ASA (with GNS3 config)
In this article, we will be looking at Network Address Translation (NAT) on the Cisco ASA. I will assume the readers of this article know what NAT and the Cisco ASA are, so I will just give an overview. In the simplest form, the Adaptive Security Appliance (ASA) is Cisco’s …
Read More »Cisco ASA as DHCP Server with Multiple Internal LANs
This article describes the configuration of an interesting network scenario that is applicable in many real world situations, mainly in small to medium networks. We have three different internal LAN networks which host user computers and other IT infrastructure (servers, network printers etc). We want to separate the three internal …
Read More »Cisco ASA 5505 Configuration: 6-Steps Basic Tutorial
The Cisco ASA 5505 Firewall is the smallest model in the new 5500 Cisco series of hardware appliances. Although this model is suitable for small businesses, branch offices or even home use, its firewall security capabilities are the same as the biggest models (5510, 5520, 5540 etc). The Adaptive Security …
Read More »Firewall Migration: 8 Steps Practical Guide
As a security consultant, in the last years I’ve been involved in a good amount of projects about network firewall migration. As technology evolves and performance increases, it is normal to decide not only for a hardware upgrade but for a complete migration to a different vendor that is a …
Read More »Can’t write mem on ASA
Today while working on a config of a new ASA5510 I ran into a very strange error that I wanted to share with you. I was configured the ASA as usual. When I was finished, I issued the standard “write mem” and saw the most bizarre error message… asa# wr …
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