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Category Archives for "Networking"

Load balancing large flows on multi-path networks

Figure 1: Active control of large flows in a multi-path topology
Figure 1 shows initial results from the Mininet integrated hybrid OpenFlow testbed demonstrating that active steering of large flows using a performance aware SDN controller significantly improves network throughput of multi-path network topologies.
Figure 2: Two path topology
The graph in Figure 1 summarizes results from topologies with 2, 3 and 4 equal cost paths. For example, the Mininet topology in Figure 2 has two equal cost paths of 10Mbit/s (shown in blue and red). The iperf traffic generator was used to create a continuous stream of 20 second flows from h1 to h3 and from h2 to h4. If traffic were perfectly balanced, each flow would achieve 10Mbit/s throughput. However, Figure 1 shows that the throughput obtained using hash based ECMP load balancing is approximately 6.8Mbit/s. Interestingly, the average link throughput decreases as additional paths are added, dropping to approximately 6.2Mbit/s with four equal cost paths (see the blue bars in Figure 1).

To ensure that packets in a flow arrive in order at their destination, switch s3 computes a hash function over selected fields in the packets (e.g. source and destination IP addresses Continue reading

Integrating Route Explorer with the OpenDaylight Controller for SDN Provisioning

Integrating Route Explorer with the OpenDaylight Controller for SDN Provisioning

by Steve Harriman, VP of Marketing - May 13, 2014

Despite the hype surrounding SDN, no one can afford to leap frog to the new technology. They must have a strategy to integrate the new with the old to reap the biggest benefits. Packet Design has taken its first step in helping customers do so. We’ve integrated Route Explorer with the OpenDaylight controller to automate SDN provisioning of RSVP-TE tunnels. For network engineers, this means eliminating the manual process of creating tunnels. They can simply plan it in Route Explorer and have the OpenDaylight controller automatically provision it. Some of our early adopter customers – especially service providers – are very happy about this. 

OpenDaylight only supports TE tunnels today, but our integration is an example of how we can support SDN in hybrid environments. Our analytics technology is unique because it allows us to build SDN conforming applications in the presence of non-conforming applications. You don’t have to do a forklift hardware upgrade in the network or build a brand new network architecture where the controller provisions everything. We are able to demonstrate provisioning of RSVP-TE tunnels in hybrid environments Continue reading

Routing-Bits SP Update

    The next installment of the SP handbook is now available. It includes two new chapters and an extra appendix. Please check your email for instructions. Contact me if your email address has changed.Filed under: CCIE SP

Recap of ONUG Conference 2014

Last week I attended the Open Networking User Group conference. My main reason for attending was to participate in three roundtable discussions put on by Tech Field Day. These sessions were recorded, and I’ll be following up with specific thoughts on each session in later blog posts.

These round-tables only occupied a portion of the two-day conference, so I spent the remainder of the time speaking with some of the vendors and sitting in a few of the sessions.

Sessions

I wasn’t permitted to attend a large chunk of ONUG sessions, and I’ll get to that in the next paragraph. I did manage to see a good friend Kyle Mestery present on two of my favorite topics – OpenDaylight and OpenStack. The sessions at ONUG were not recorded, but I’ll again direct you to this video for a reasonably close approximation:

Kyle is the embodiment of the passion and energy found in great communities like OpenStack and OpenDaylight, and if you ever have the opportunity to hear him present, I encourage you to take it.

I also finally got to meet Brad Hedlund in meatspace:

Cisco Live 2014 – Final Countdown!

  Ok, that video probably dates me a bit, and that is OK.  This will be my 9th consecutive time attending Cisco Live (aka Networkers).  Just a few final things to share before the event kicks off. The other day I received an e-mail from Cisco Live with a special announcement.  It reads: This is a […]

Into the Light of Day: Uncovering Ongoing and Historical Point of Sale Malware and Attack Campaigns

Point of Sale systems that process debit and credit cards are still being attacked with an increasing variety of malware. Over the last several years PoS attack campaigns have evolved from opportunistic attacks involving crude theft of card data with no centralized Command & Control, through memory scraping PoS botnets with centralized C&C and most recently to highly targeted attacks that require a substantial amount of lateral movement and custom malware created to blend in with the target organization.

While contemporary PoS attackers are still successful in using older tools and methodologies that continue to bring results due to poor security, the more ambitious threat actors have moved rapidly, penetrating organizational defenses with targeted attack campaigns. Considering the substantial compromise lifespans within organizations that have active security teams and managed infrastructure, indicators shared herein will be useful to detect active as well as historical compromise.

Organizations of all sizes are encouraged to seriously consider a significant security review of any PoS deployment infrastructure to detect existing compromises as well as to strengthen defenses against an adversary that continues to proliferate and expand attack capabilities.

In addition to recent publications discussing Dexter and Project Hook malware activity, Arbor ASERT is currently Continue reading

Recap of ONUG Conference 2014

Last week I attended the Open Networking User Group conference. My main reason for attending was to participate in three roundtable discussions put on by Tech Field Day. These sessions were recorded, and I’ll be following up with specific thoughts on each session in later blog posts. These round-tables only occupied a portion of the two-day conference, so I spent the remainder of the time speaking with some of the vendors and sitting in a few of the sessions.

Recap of ONUG Conference 2014

Last week I attended the Open Networking User Group conference. My main reason for attending was to participate in three roundtable discussions put on by Tech Field Day. These sessions were recorded, and I’ll be following up with specific thoughts on each session in later blog posts. These round-tables only occupied a portion of the two-day conference, so I spent the remainder of the time speaking with some of the vendors and sitting in a few of the sessions.

Quiz #24 – OSPF Default-Information Originate Always

Type: Lab Difficulty: Intermediate Company ABC has multiple buildings (A, B, C and D) and two internet connections to ISP-1 (in Building-B) and ISP-2 (in Building-C). Building-A has a CORE router connected to the Border Router in Building-B (BR-B). Both BR-B and BR-C receive a default route via eBGP from the ISPs and are configured identically to inject it into the OSPF Area 0 that covers all internal routers as... [read more]

Tails 1.0: A bootable Linux distro that protects your privacy

Whatever your primary OS, Linux distro Tails 1.0 offers a plethora of security features to help you work online without worrying about privacy issues.These days, it seems as though anyone who uses the Internet is a tasty morsel for insatiable data thieves. Marketers, governments, criminals and random snoops won't be satisfied until they can snarf whatever information they want about us at any time.If you want to dodge ad trackers, have sensitive sources to protect or you just want to conduct your normal online activities without being spied on, then The Amnesiac Incognito Live System (better known as Tails) could help.To read this article in full or to leave a comment, please click here

QUIZ #24 &#8211 OSPF Default-Information Originate Always

Company ABC has multiple buildings and two internet connections via 2 different ISPs. Both BR-B and BR-C receive a default route via eBGP from the ISPs and they inject it in OSPF. For some reason, when ISP-1 link goes down, entire Building-A looses the internet access ! Something must be wrong...

Community Show – CCDE Preparation and Recommendations

Cisco Certified Design Expert exam is the popular expert level vendor independent certification. In my first podcast I talked   with my three guests who have CCDE as well ,  about preparation, resources, recommendations and many other topics. We also discussed whether CCIE is losing its value. Please share your comments about this podcast.   Participants […]

Author information

Orhan Ergun

Orhan Ergun, CCIE, CCDE, is a network architect mostly focused on service providers, data centers, virtualization and security.

He has more than 10 years in IT, and has worked on many network design and deployment projects.

In addition, Orhan is a:

Blogger at Network Computing.
Blogger and podcaster at Packet Pushers.
Manager of Google CCDE Group.
On Twitter @OrhanErgunCCDE

The post Community Show – CCDE Preparation and Recommendations appeared first on Packet Pushers Podcast and was written by Orhan Ergun.

Community Show – CCDE Preparation and Recommendations

[player] Cisco Certified Design Expert exam is the popular expert level vendor independent certification. In this podcast Orhan Ergun – CCIE & CCDE  talks   with his three guests who have CCDE certificate as well ,  about preparation, resources, recommendations and many other topics. We also discussed whether CCIE is losing its value. Please share […]

The post Community Show – CCDE Preparation and Recommendations appeared first on Packet Pushers.

Cisco Live 2014 Schedule

We are just a little over a week away from Cisco Live and I think I have my schedule finalized. In case you are interested –  here is my schedule for the event. When I am not in a class, there is a good chance you may find me in the Social Media Lounge.  Feel […]

Show 188 – Introducing A10 Networks

In this sponsored show we introduce A10 Networks and it's all about application deliver controllers, load balancers and speed like you have never seen because of smart software architecture.

Author information

Greg Ferro

Greg Ferro is a Network Engineer/Architect, mostly focussed on Data Centre, Security Infrastructure, and recently Virtualization. He has over 20 years in IT, in wide range of employers working as a freelance consultant including Finance, Service Providers and Online Companies. He is CCIE#6920 and has a few ideas about the world, but not enough to really count.

He is a host on the Packet Pushers Podcast, blogger at EtherealMind.com and on Twitter @etherealmind and Google Plus.

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The post Show 188 – Introducing A10 Networks appeared first on Packet Pushers Podcast and was written by Greg Ferro.

Anycast HSRP and Design Considerations

HSRP is the first hop redundancy Cisco property protocol which allows a transparent failover of the first-hop gateway. Many technologies have been slightly modified to use it efficiently. In this article although Anycast hsrp will be explained but first I want to first explain how basically HSRP works.   HSRP has Version 1 and 2. […]

Author information

Orhan Ergun

Orhan Ergun, CCIE, CCDE, is a network architect mostly focused on service providers, data centers, virtualization and security.

He has more than 10 years in IT, and has worked on many network design and deployment projects.

In addition, Orhan is a:

Blogger at Network Computing.
Blogger and podcaster at Packet Pushers.
Manager of Google CCDE Group.
On Twitter @OrhanErgunCCDE

The post Anycast HSRP and Design Considerations appeared first on Packet Pushers Podcast and was written by Orhan Ergun.

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