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Tag: security

IPSec Site-to-Site VPN in 10 seconds

Posted on January 31, 2010   by lukas

This is a very basic configuration example for a site-to-site IPSec VPN. You should understand what the parameters mean, before you set it up for production.

Posted in security, vpn    Tagged example, security, vpn    Leave a Comment on IPSec Site-to-Site VPN in 10 seconds   

How to protect your network from malicious traffic

Posted on December 25, 2009December 26, 2009   by lukas

Lately I stumbled upon a Cisco 877 security hardening guide. The suggestion is to block (via source IP) private, reserved and unallocated IP ranges. I will explain why this is a bad idea and how to properly block malicious traffic.

Posted in hints, security    Tagged hint, security    Leave a Comment on How to protect your network from malicious traffic   

Why disabling ICMP unreachables is a bad thing

Posted on November 22, 2009December 9, 2009   by lukas

In this post I will talk about ICMP unreachables, the security concerns about them and why you shouldn’t disable it on your routing boxes.

Posted in hints, security    Tagged hint, security    2 Comments on Why disabling ICMP unreachables is a bad thing   

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