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Category Archives for "Networking"

Making Your Wireless Guest Friendly

Wireless

During the recent Virtualization Field Day 4, I was located at a vendor building and jumped on their guest wireless network. There are a few things that I need to get accomplished before the magic happens at a Tech Field Day event, so I’m always on the guest network quickly. It’s only after I take care of a few website related items that I settle down into a routine of catching up on email and other items. That’s when I discovered that this particular location blocked access to IMAP on their guest network. My mail client stalled out when trying to fetch messages and clear my outbox. I could log into Gmail just fine and send and receive while I was on-site. But my workflow depends on my mail client. That made me think about guest WiFi and usability.

Be Our (Limited) Guest

Guest WiFi is a huge deal for visitors to an office. We live in a society where ever-present connectivity is necessary. Email notifications, social media updates, and the capability to look up necessary information instantly have pervaded our lives. For those of us fortunate enough to still have an unlimited cellular data plan, our connectivity craving Continue reading

DDoS Attacks in the Wake of French Anti-terror Demonstrations

On January 15th, France’s chief information systems defense official, Adm. Arnaud Coustilliere, announced a sharp rise in online attacks against French web sites:

“Calling it an unprecedented surge, Adm. Arnaud Coustilliere, head of cyberdefense for the French military, said about 19,000 French websites had faced cyberattacks in recent days, …” [1].

As we’ve done in the recent past for North Korea [2], Hong-Kong [3], and Israel [4], we can leverage Arbor’s ATLAS initiative to observe how real world conflict is reflected in the digital realm. ATLAS receives anonymized Internet traffic and DDoS event data from over 330 participating Internet Service Providers worldwide. In particular, we are interested in DDoS attacks before and after Sunday, January 11th. As reported in [1],

“Coustilliere called the attacks a response to the massive demonstrations against terrorism that drew 3.7 million people into the streets Sunday across France.”

In order to gauge this response, we compare the DDoS attacks that took place between January 3rd and January 10th to the DDoS attacks that took place between January 11th and January 18th inclusive.

Attack Frequency

Between January 3rd and January 18th, a total of 11,342 Continue reading

That HP SDN App Store

HP SDN App Store Logo

December 2014 found me in Barcelona as a guest of HP at the “HP Discover” event. Nominally I went to see what was up in the world of networking, but as you can imagine with the breadth of products that HP produces, I found myself looking at all sorts of things. I’ll cover a few fun things in other posts, but I’ll start with a bit of networking because, well, this is MovingPackets after all.

HP SDN App Store

I mentioned the HP SDN App Store in a previous post about HP Openflow. One of the fears I raised was how an App Store would work in terms of support. Talking to a contact at HP made things a little clearer, and there’s actually quite a nice – and perhaps obvious – support plan for the Apps you can download. Effectively, there are three tiers of supported applications as I understand it, and a glance at the App Store shows that these are now called “Apps Circles”:

  1. App Circle 1: Apps that HP develops. These have full support direct from HP, as they are HP products, effectively.
  2. App Circle 2: Apps that are developed by HP AllianceOne partners Continue reading

Field Trip: Networking Field Day

Very excited to announce I was invited to participate in Networking Field Day #9. The first question is: What is Networking Day? Well it is an event where we (networkers) get to participate, listen, and interact with various different vendors. And I’ll be joining a great group, a few of which I’ve met at the […]

Brocade offering free SDN for one year

Brocade this week said it is shipping its SDN controller and offering it free for one year.Brocade’s Vyatta Controller was announced last September. It is based on the OpenDaylight open source “Helium” release.+ MORE ON NETWORK WORLD: Why SDN All-Stars are heading to Brocade +To read this article in full or to leave a comment, please click here

Wi-Fi: The jungle of the Unlisenced

This is a follow-up on the recently published Packet Pushers Show 221 – Marriott, Wifi, + the FCC with Glenn Fleishman & Lee Badman. Let me begin by stating my role in the ecospace: I am currently overseeing the expansion of broadband into Indianfield Co-operative Campground (indianfieldcampground.com) in the town of Salem (A less populous […]

Author information

Mitchell Lewis

Mitchell is a young technology professional with an interest in networking & communications. He takes an interest in the ever changing telecom space as well as other networking technologies (datacenter etc). His main hobby project is overseeing the expansion of broadband into a co-operative campground, shares of which are owned by a family member.

Mitchell currently is a Cisco Certified Entry Level Tech (CCENT Certified) with intentions of obtaining higher as time permits. He graduated from the Connecticut Technical High School system with a focus in Information Systems Technology (Combination of Higher Ed MIS & Computer Science). While there he developed the production computing platform for his academic department( servers, networking, desktop).

He is currently pursing higher education from the UCONN School of Business & welcomes any opportunity to further advance his experience in the IT Field & professional Continue reading

vLAG Caveats in Brocade VCS Fabric

Brocade VCS fabric has one of the most flexible multichassis link aggregation group (LAG) implementation – you can terminate member links of an individual LAG on any four switches in the VCS fabric. Using that flexibility is not always a good idea.

2015-01-23: Added a few caveats on load distribution

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Docker Networking 101 – The defaults

We’ve talked about docker in a few of my more recent posts but we haven’t really tackled how docker does networking.  We know that docker can expose container services through port mapping, but that brings some interesting challenges along with it.

As with anything related to networking, our first challenge is to understand the basics.  Moreover, to understand what our connectivity options are for the devices we want to connect to the network (docker(containers)).  So the goal of this post is going to be to review docker networking defaults.  Once we know what our host connectivity options are, we can spread quickly into advanced container networking. 

So let’s start with the basics.  In this post, I’m going to be working with two docker hosts, docker1 and docker2.  They sit on the network like this…

 

image 
So nothing too complicated here.  Two basic hosts with a very basic network configuration.  So let’s assume that you’ve installed docker and are running with a default configuration.  If you need instructions for the install see this.  At this point, all I’ve done is configured a static IP on each host, configured a Continue reading

Validation Testing Matters

A couple of weeks ago, a CLN Member Posted a question with the heading Does ASA drop active session.

The specific question was as follows–

I have a time based ACL configured on a Cisco ASA. I need to know if the active sessions are dropped by the ASA when the time limit is over.

For example, users are allowed to connect between 12 and 1 PM. If there are any active connections just before 1 PM then will they be dropped at 1 PM?

Many network and security administrators would blindly assume that a time-based ACL would block or allow traffic based on the time-range attached to the individual ACE. Having quite a lot of experience with the ASA, I was skeptical and assumed that any ongoing connections would continue to allow the flow of traffic. I decided to do a little testing and here is what I found.

  1. Viewing the ACL, the time based ACE (line in the ACL) switched from active to inactive about 60-70 seconds after I expected it to
  2. When testing with sessionized ICMP (fixup protocol icmp–to enable ICMP inspection), ICMP Echoes were blocked as soon as the ACE switched to inactive
  3. Testing with TCP, a connection through Continue reading

Configuring a load balancer with VMware NSX

In the previous post a NAT has been configured to allow access from external networks:   Now the edge router will act as a load balancer too: connection to the edge router with destination port 2222 will be balanced on both internal VM using the port 22. Go to “Networking & Security -> NSX Edges”, […]

Configuring NAT and firewall on a NSX Edge Router

On a previous post the edge router has been connected to external network: In this post NAT and Firewall will be configured to allow SSH access to VM1 from external networks. Go to “Networking & Security -> NSX Edges”, double click on the edge router and follow “Manage -> NAT”. Add a DNAT role so […]

But Does it Work?

When I was in the USAF, a long, long, time ago, there was a guy in my shop — Armand — who, no matter what we did around the shop, would ask, “but does it work?” For instance, when I was working on redoing the tool cabinet, with nice painted slots for each tool, he walked by — “Nice. But does it work?” I remember showing him where each tool fit, and how it would all be organized so we the pager went off at 2AM because the localizer was down (yet again), it would be easy to find that one tool you needed to fix the problem. He just shook his head and walked away. Again, later, I was working on the status board in the Group Readiness Center — the big white metal board that showed the current status of every piece of comm equipment on the Base — Armand walked by and said, “looks nice, but does it work?” Again, I showed him how the new arrangement was better than the old one. And again Armand just shook his head and walked away. It took me a long time to “get it” — to Continue reading

PQ Show 42 – HP Networking – Location Aware Wireless

This sponsored podcast is another in our series of recordings made at HP Discover 2014 in Barcelona, Spain. Once again, our special thanks to Chris Young for bringing us technical guests and not just fluffy marketing folks. Technical Marketing Engineer at HP Networking Yarnin Israel and Senior Research Scientist at HP Labs Souvik Sen join Packet […]

Author information

Ethan Banks

Co-host at Packet Pushers

Ethan Banks, CCIE #20655, has been managing networks for higher ed, government, financials and high tech since 1995. Ethan co-hosts the Packet Pushers Podcast, which has seen over 3M downloads and reaches over 10K listeners. With whatever time is left, Ethan writes for fun & profit, studies for certifications, and enjoys science fiction. @ecbanks
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The post PQ Show 42 – HP Networking – Location Aware Wireless appeared first on Packet Pushers Podcast and was written by Ethan Banks.

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