Fabio Semperboni

802.1x: Introduction and general principles

IEEE 802.1X is an IEEE Standard for port-based Network Access Control to prevent unauthorized devices from gaining access to the network. It defines the...

How to set up raid on Cisco ISE appliance

Recently, I have installed an ISE 2.6 cluster based by two SNS3615 appliances. After some months, the customer asked me to redundant each hard...

BGP route leak sends European traffic via China

On Thursday June 6, 2019, traffic destined to some of Europe's biggest mobile providers was misdirected in a roundabout path through the Chinese-government-controlled China...

StackWise Virtual on Catalyst 9500

During the Cisco Live 2016 in Las Vegas, Cisco presented the new feature named "StackWise virtual" supported by the IOS XE Denali in the...

Critical SSH flaw affects Nexus 9000

The first of May, Cisco has revealed that its Nexus 9000 fabric switches have a critical flaw that could allow anyone to remotely connect...

Troubleshoot a DMVPN phase 3 architecture

In the last article, I explained how to configure DMVPN phase3, but what are the most useful commands to troubleshoot this type of network...

DMVPN Phase 3: a complete guide

In a previous article, I explained what is and how it works DMVPN technology. In this article you see how to configure DMVPN phase3. This...

Understanding Cisco DMVPN

In an old post, dated 2011, I explained various types of VPN technologies. In seven years several things have changed: SHA1 is deprecated, des...

Cisco Smart Install Remote Code Execution

At the end of March, Cisco published a stack-based buffer overflow vulnerability in Smart Install Client code. This vulnerability enables an attacker to remotely...

Cisco WebVPN critical bug. Patch it now!

Few days ago, Cisco published a critical advisor with a score of 10/10 about ASA and Firepower devices. The vulnerability known as CVE-2018-0101 and...