Fabio Semperboni

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...

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...

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...

Cisco EIGRP named, a better approach

The Enhanced Interior Gateway Routing Protocol can be configured using either the classic mode or the named mode. The classic mode is the old...

WPA2 is no more secure

WPA2 (Wi-Fi Protected Access 2) is a network security technology commonly used on Wi-Fi wireless networks. It's an upgrade from the original WPA technology,...

The power of prefix lists

Prefix lists are used in route maps and route filtering operations and can be used as an alternative to access lists in many route...