Hardening Network Infrastructure: Bulletproof Your Systems by Wes Noonan

By Wes Noonan

Bulletproof your procedure sooner than you're hacked! From the writer of the overseas best-seller, Hacking uncovered, here's a impressive new providing written with a keenness for safeguard that can assist you make the required enhancements and take the basic steps to safe your community infrastructure. The concise and constant technique breaks down defense into logical components, supplying you with activities to take instantly, details on hardening your process from the pinnacle down, and eventually while to return and make extra improvements.

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Obviously, the need to harden your routing protocols at your firewall is a critical business need. Using Static Routes As a general rule, I recommend that you only configure static routes on your firewalls. This ensures that your firewalls are not susceptible to poisoned updates and such. The drawback, of course, is that maintaining static routes in an enterprise environment can be all but impossible to do. For the Cisco PIX firewall, entering static routes is a straightforward process that involves running the following command at the CLI: firewall(config)# route ( [] Heads Up The Cisco PIX cannot be used as a router between multiple networks on the same interface.

Every firewall can be hardened beyond what the vendors do to protect the system against being compromised. As you saw in this chapter, a basic template for hardening your firewalls consists of the following steps: • Harden remote administration. Prevent remote administration where possible, and permit only secure remote administration if you must allow it. • Implement authentication and authorization. Implement unique usernames and hard-to-guess passwords, and only allow users to run the commands required.

With that said, I firmly believe that syslog should be required when implementing any firewall. The reason for this is simple: syslog has the ability to show you everything that is happening on your firewall at any given time. Using syslog as a Troubleshooting Tool During the week I was writing this chapter, I walked into a customer location, installed and configured syslog in their environment, and isolated a routing problem and a VPN problem that they were unaware were the causes of some other issues, within minutes of having syslog configured and operational.

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