Routing and Switching

Inexpensive 802.1x Solutions

Many enterprises in the DoD and US Federal Government are struggling with how to implement inexpensive 802.1x solutions for their wired LANs.  Especially in the DoD, there are specific regulations that require the use of 802.1x on the Unclassified Networks (NIPRNet) and Classified Networks (SIPRNet).  For your reference, those requirements are called Security and Technical …

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DNS: Back to Basics for Network Engineers

Speaking with quite a few network engineers in the last few months, I was shocked by the lack of real understanding of the Domain Naming System (DNS).  It shocked me because it is the singular application functionality that is entirely network-based.  Meaning that DNS is the foundation of the Internet, and from their perspective, should …

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Authentication for OSPFv3 Address Family support in IOS-XE? Think again

Bottom line up front: Cisco has a broken implementation of OSPFv3 authentication. This story begins like many do with network engineers trying to do their best in implementing IPv6 after a thorough and exhaustive engineering exercise.  Cisco’s Aggregation Services Router (ASR) routing platform running IOS-XE, starting with version 3.1.0 until the most recent  3.09.02 S, …

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Yubikey and Windows Domain 2-Factor Authentication

Picking up where we left off last, I was showing you the awesome usefulness, security and affordability of Yubikey (Yubico’s 2-Factor authentication token) and using it for 2-factor authentication on network devices.  Well, I’d like to go another step forward: 2-Factor authentication for Windows computers to a Windows Active Directory environment.  If your enterprise deployment …

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Cisco IPv6 IOS Hardening – DoD Style

***Updated on 14 May 2014 – regarding NET-IPv6-022, See below*** Thousands of network engineers in the DoD out there looking at implementing IPv6 now have to address a few Security and Technical Implementation Guidance (STIG) items that they used to just annotate as “Not Applicable – NA.”  Now, IPv6 security is important.  If you are …

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Why 802.1x is Not Enough: How to Implement SeND – Part 2

Last month I presented the case as to why 802.1x authentication is not enough for local network (wired or wireless) security (go back here to read).  In this post I will present an alternative: IPv6 Secure Neighbor Discovery (SeND).  If you have an IPv6 enterprise, small IPv6 deployment, or a little IPv6 lab then pay …

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Why 802.1x is Not Enough: Use IPv6 SeND – Part 1

There’s been much debate in the IPv6 community regarding the abysmal support or IPv6 Secure Neighbour Discovery (SeND).  To get you up to speed on what IPv6 Secure Neighbour Discovery is think IPv6 + 802.1x-like + ARP security + PKI environment.  Later in this blog I’ll show you how to set up an IPv6 SeND …

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SDN, Open Flow and Cisco ONE: A First Look

Software Defined Networking (SDN) is the new buzzword in IT today.  It has become synonymous with things like cloud, cyber security, CDN, and yes even IPv6.  The curious thing is that they are all inter-related.  Open Flow, which is a specification of the Open Network Foundation, has defined this new phenomenon as something that, “enables …

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