One of the most common types of DDoS attacks is the UDP-based amplified reflection attack. I will now explain how this attack works and what makes it so hard to protect against it. The most targeted systems is web servers.…
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DDoS attacks – an explanation of amplified reflective UDP-based attacks
Tagged with: amplification, amplified, attack, botnet, ddos, denial of service, reflector, stresser, udp
Posted in General Security, Security
Posted in General Security, Security
How to setup ssh keypair authentication in Cisco ASA
I created a short video on how to configure Cisco ASA to allow a CLI user to authenticate with RSA keypair when connecting with SSH instead of username/password. See video below. In short, this is how to do it: username…
Cisco ASA Anyconnect licensing for dummies, updated!
The picture below should be self-explaining. Click it for a larger version. Edit 2014: There was some errors in the logics around AEA-licenses. The picture below is now corrected. Please do not use the old version (v1.1). Let me…
DNS Doctoring in Cisco ASA
Issue: Your internal clients tries to reach an internal server but since they resolves the address of the server from an external DNS-server they will get a public IP. Solution: DNS Doctoring. In the example below your client…
IPv6 address assignment will be messy
I am currently working with developing an introductionary workshop for IT consultant with the subject of IPv6. Scope: A client (windows 7) is connected to an internal network. On the same network there is a router facing internet, and a…
Tagged with: dhcp, dhcpv6, Ipv6, Router Advertisment
Posted in General Networking, General Security, Security
Posted in General Networking, General Security, Security
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