OSPFv3 for IPv4 and IPv6

Many enterprises use OSPF version 2 for their internal IPv4 routing protocol. OSPF has gone through changes over the years and the protocol has been adapted to work with IPv6. As organizations start to contemplate how they will...

09/02/13

IPv6 Network Management

Good engineering practices dictate that when we prepare to build something we must plan for the long-term operations. Having the ability to properly manage the technology after it is deployed will ensure its longevity. If the...

07/24/13

Mobile Devices and BYOD are Driving IPv6 Adoption

In 2013, it is expected that the number of mobile devices will exceed the number of people. Each of these devices will need an IP address to reach content on the Internet. The Bring Your Own Device (BYOD) movement is driving the...

06/24/13

Jumbo Frames

Many networks use 1500-byte MTU size, but the MTU size can be reduced by encapsulation, tunneling or other overlay network protocols. These situations reduce the end-to-end effective MTU size which reduces throughput and network...

06/03/13

MTU Size Issues

The Maximum Transmission Unit (MTU) is the largest number of bytes an individual datagram can have on a particular data communications link. When encapsulation, encryption or overlay network protocols are used the end-to-end...

05/18/13

Life in a Dual Stack World

Last week was the 2013 North American IPv6 Summit conference. This was the 6th year of the IPv6 conference held in Denver, CO. One of the items that all attendees received at the registration booth was an IPv6 Buddy keypad. This...

04/23/13

Kali Linux: The Next BackTrack

Security professionals have been relying on the BackTrack security distribution for many years to help them perform their assessments. The industry has been waiting for the next major release of BackTrack. However, the creators of...

03/24/13

Using Dual Protocol for SIEMs Evasion

It is just a fact of life that attackers and defenders are now operating in a dual-protocol world. With the addition of IPv6, attackers are learning new tricks and defenders will need to anticipate and protect against those new...

02/24/13

Core Networking and Security 100th Blog Post

This is my 100th blog post for the Network World Cisco Subnet community. As I reflect on the last four years of writing this blog, I think about the fun I've had sharing ideas with you and hearing your feedback. In this blog I list...

02/03/13

IPv6 Certifications

Many networking, systems and security engineers have been studying IPv6-related topics for many years. You may be wondering if you can get a certification to show for all the time and effort you have spent learning IPv6. IPv6 has...

01/26/13

9 Common Spanning Tree Mistakes

9 Common Spanning Tree Mistakes

Ethernet devices running the Spanning Tree Protocol (STP) have been implemented in networks since the early 1990s. Many organizations take STP for granted and do not configure it per industry best practices. STP errors are very...

01/02/13

Time to Upgrade Cisco Catalyst 6500 Non-E-Series Chassis

The Cisco 6500 Ethernet switches were introduced in 1999 and have been deployed by more than 45,000 organizations. Cisco has continued to come out with additional supervisor modules and interface modules and larger power supplies to...

12/01/12

U.S. Government Progress on IPv6 Deployment

The United States government has been striving to deploy IPv6 for many years. October 1st was the date that the government wanted to have functional IPv6-enabled Internet applications. Some agencies were able to configure some of...

11/26/12

IPv6 Is Not an All-or-Nothing Proposition

I have recently met many people who are under the impression that an organization must transition directly from IPv4 to IPv6. Thankfully, this is not the case. You can run IPv4 and IPv6 side-by-side during the interim stage of...

10/29/12

Achieving PCI Compliance When Using IPv6

The PCI DSS was written with IPv4 in mind and it requires that NAT be used to protect servers containing cardholder information. IPv6 networks do not need NAT and, in fact, use of NAT is less than ideal. The PCI DSS does not...

10/07/12

Web Application Firewalls and IPv6

Many organizations may be using a Web Application Firewall (WAF) to help them achieve security compliance and secure their web applications. Many organizations are also actively deploying IPv6 to their web systems. The intersection...

09/11/12

Dual-Stack Will Increase Operating Expenses

As we start to plan for IPv6 and start to deploy it on our networks we should try to anticipate the operational costs related to running both IPv6 and IPv4. IPv6 provides more addresses and some minor opportunities for cost savings....

07/31/12

Life After World IPv6 Launch

It has been several weeks since World IPv6 Launch took place on June 6th. However, it will remain the single biggest event in the development of IPv6 for many years. World IPv6 Launch was heavily promoted, but in the end, no one...

06/23/12

Preparing Your Enterprise for World IPv6 Launch

Last year on June 8, 2011 we all experienced World IPv6 Day. This was a 24-hour test for web sites to use both an IPv4 and IPv6 addresses simultaneously for the same URL. One June 6, 2012 there will be World IPv6 Launch in which...

05/19/12

What About Stream Control Transmission Protocol (SCTP)?

Many in the networking industry may not be aware that SCTP exists and the benefits that it provides end-to-end Internet communications. We use TCP over IP for most unicast communications and the Internet is delivered over HTTP these...

04/30/12

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