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Easy Steps to Cisco Extended Access List The purpose of this document is to explain in simple words how you can easily create an Extended Access List and apply it to your Cisco Router interface. This document is intended for the novice network security personnel who has a basic understanding of networking essentials. For example, you were recently assigned to the network security section and tasked to protect your network by creating an Extended Access-lists to block ports and suspicious Internet Protocol addresses on your router.
04/17/2004
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Cisco Router Hardening Step-by-Step There are three main categories of routers in use at companies today. Not brands such as Cisco, Nortel and Juniper, but three types that include Internet Gateway routers, Corporate Internal routers and B2B routers. These three categories of routers should all be given consideration from a security perspective, because they each pose unique security problems that should be addressed. For all the reasons, a set of standard practices for hardening a router becomes a necessity. Certain variations will always need to be addressed based on the topology of the network, the protocols used and the business needs. Those variations should be exceptions to the written security policy and should be noted because they could expose the company to certain risks.
04/14/2004
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Cisco Router Hardening Guide (Spanish) Spanish paper: Hardening Cisco IOS routers. This paper gives the administrator guidelines in order to setup a secure Cisco router.
04/05/2004
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Understanding and Implementing TACACS+ This paper will focus on understanding and implementing TACACS+, however the same methodology can be applied to other protocols that handle access control. What is TACACS+? TACACS+ stands for Terminal Access Control Access Control Server. It is a derivative of the TACACS application used by Defense data network (DDN). Cisco made some enhancement to the TACACS application and thus TACACS+ came into existence as a Cisco Proprietary Protocol. The main goal of TACACS+ is to provide a centralized database against which to perform authentication. In actuality TACACS+ provides Authentication, Authorization, and Accounting (AAA).
03/24/2004
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Implementing Secure Access to Cisco Devices using TACACS+ and SSH Many environments that I encounter are using a Defense-In-Depth network security strategy. They have implemented firewalls, Intrusion Detection, VPN, and have a good security policy. When asked, however, how they manage their large installation of Cisco network devices, the reply many times is clear-text telnet, no username/password authentication combination, and very little in the way of auditing logs. The goal of this paper is to provide an easy guide for network administrators to implement secure remote access for all Cisco networking equipment.
03/24/2004
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8 steps to protect your Cisco router In this article I will give you 8 steps, easy to follow, to minimize your Cisco router exposure by turning off some unused services, applying some access control and applying some security options available on that 1- Control Access to your router; 2- Restrict telnet access to it; 3- Block Spoof/Malicious packets; 4- Restrict SNMP; 5- Encrypt all passwords; 6- Disable all unused services; 7- Add some security options; 8- Log everything
03/23/2004
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NSA Cisco Router Configuration Guide National Security Agency (NSA) guide for configuring Cisco routers in a secure manner.
03/08/2004
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