Creating a Vagrant base box for RHEL with Bento
I <3 the Opscode Bento project. I use the Amazon S3 hosted images for pretty much all of my Vagrant boxes. When I started to use RHEL, I didn't want to make an exception... Fortunately Bento allows you to build your own RHEL, OSX or Windows boxes using Packer. This is how I built my RHEL 6.4 x64 box, but this process should work for any other box you want to build manually...
Creating a Vagrant base box for RHEL with Bento
I <3 the Opscode Bento project. I use the Amazon S3 hosted images for pretty much all of my Vagrant boxes. When I started to use RHEL, I didn't want to make an exception... Fortunately Bento allows you to build your own RHEL, OSX or Windows boxes using Packer. This is how I built my RHEL 6.4 x64 box, but this process should work for any other box you want to build manually...
HP Unified Wireless: Free access option on guest portal
This post covers a simple portal web interface customization, which will provide a “Free Access” option for guest users. Some organizations do not want to administer guest accounts, but simply want to display a legal disclaimer which should be accepted … Continue reading
Show 190 – The Silicon Inside Your Network Device – Part 3
The third and final episode in the very popular series on where we attempt to discover what really happens inside your network device.
Although software will be at heart of network innovation for the enxt decade, it will still run on hardware and it's time to expose the internals of our network hardware and understand the hardware architecture inside a typical device. Many people are surprised to find that CPUs, memory, storage and buses are similar to computers while the forwarding engines are rather spectacularly different.
Author information
The post Show 190 – The Silicon Inside Your Network Device – Part 3 appeared first on Packet Pushers Podcast and was written by Greg Ferro.
NFV – CPE vendors MUST evolve!
Customer Premises Equipment (CPE) devices have always been a pain point for the service providers. One, they need to be installed in large large numbers (surely you remember the truck rolls that need to be sent out), and second, and more importantly, they get complex and costlier with time. As services and technology evolve, these need to be replaced with something more uglier and meaner than what existed before. In a large network, managing all the CPEs — right from the configuration, activation, monitoring, upgrading and efficiently adding more services – in itself becomes a full time job (and not the one with utmost satisfaction i must add).
ETSI’s Use case #2 describes how the CPE device can be virtualized. The idea is to replace the physical CPEs with all the services it supports on an industry standard server that is and cheaper and easier to manage. Doing this can reduce the number and complexity of the CPE devices that need to be installed at the customer sites.
The jury is still out on the specific functions that can be moved out of the CPE. Clearly, what everybody agrees to is a need for a device that will physically connect the customer to the network. Continue reading
The Best Of Both Worlds – Soraya
By Matt Bing & Dave Loftus
Arbor Networks’ ASERT has recently discovered a new malware family that combines several techniques to steal payment card information. Dubbed Soraya, meaning “rich,” this malware uses memory scraping techniques similar to those found in Dexter to target point-of-sale terminals. Soraya also intercepts form data sent from web browsers, similar to the Zeus family of malware. Neither of these two techniques are new, but we have not seen them used together in the same piece of malware.
Initialization
Soraya begins by injecting itself as a thread on several system processes, including the Windows Shell explorer.exe. The malware maintains persistence by writing a copy of itself into the AppData directory with the name servhost.exe, and setting itself to execute with the registry key HKCUSOFTWAREMicrosoftWindowsCurrentVersionRunWinServHost.
New processes launched from the infected explorer.exe shell, notably web browsers, will have Soraya code injected. The malware does this by hooking calls to the ntdll.dll!NtResumeThread() function, which is responsible for process initialization. The function ntdll!NtQueryDirectoryFile() is also hooked to hide displaying the servhost.exe file. Both of these techniques are similar to functionality found in the Zeus family of malware.
Memory Scraping
One thread Continue reading
QoS Pre-Classify – Where to Apply the Service Policy ?
This post represents the solution and explanation for quiz #23. Quiz Review This quiz shows a scenario where the network engineer has to configure Low Latency Queuing (LLQ) for some traffic that will be encrypted into an IPsec tunnel. The configuration of the policy-map is given but it has not been applied yet anywhere, as shown below: The final question is “what is missing to finish this task ?” giving... [read more]The OpenStack Network Node – Layer 3 Agent
When networks are deployed in a box by box model, network admins know exactly what, where, and how something is being configured. In highly dynamic environments, this may not be the case. This is why it’s crucial to understand what is really going on behind the scenes. In OpenStack, there are several components that together are comprised to make OpenStack Networking (aka Neutron). These include the Neutron server, dhcp agent, metadata agent, L3 agent, and then the agents that would reside in the infrastructure to be programmed (on either physical and/or virtual switches). For example, in Open vSwitch deployments, there would be a Neutron OVS agent on each host/server. And this could vary based on which particular vendor plugin is being used too!
In this post, I’m going to mainly focus on the Neutron Layer 3 agent because I had a hard time grasping this one at first. It turns out that it’s not so bad after all.
When I first started reading about Neutron, I saw many references that there was only one (1) layer 3 agent supported in a given deployment. That just didn’t seem to make sense because that Continue reading
When I first started reading about Neutron, I saw many references that there was only one (1) layer 3 agent supported in a given deployment. That just didn’t seem to make sense because that Continue reading
PQ Show 31 – Dell, Cumulus Networks and the Open Networking Revolution – Sponsored
Packet Pushers Greg Ferro and Ethan Banks recently sat down with Arpit Joshipura, VP of Product Management for Dell Networking and J.R. Rivers, CEO of Cumulus Networks, to discuss their recent historic announcement to make Open Networking solutions available to consumers worldwide.
Author information
The post PQ Show 31 – Dell, Cumulus Networks and the Open Networking Revolution – Sponsored appeared first on Packet Pushers Podcast and was written by Greg Ferro.
QoS Pre-Classify – Where to Apply the Service Policy ?
This post represents the solution and explanation for quiz-23. The quiz shows a scenario where the network engineer has to configure Low Latency Queuing (LLQ) for some traffic that will be encrypted into an IPsec tunnel. This article presents QoS Pre-Classify and other solutions to the problem...
Recap – Cisco Live US 2014
I don’t think I’m going to give a direct review of Cisco Live US this year. The conference was great with lots of stuff going on, but I really can’t contribute any more than the vast library of other posts on the subject. What I will do, though, is give my take on where I think the conference is headed. These are all my thoughts and have little to do with reality in some cases.
Social Events Passes. My wife had one of these this year, and it worked very well for meatspace networking and seeing the sites. So did Bob. And many others. This was the trendy thing to do this year, and it was successful for sure. I didn’t hear a single “I wish I could have seen that session” at all thanks to everything being available online afterward. Next year, I predict that a good number of attendees in my circles will opt for the cheaper pass; I would say 40% or so of the group will do so. After all, we go to see people and exchange ideas. Traditional learning can come when you get home.
Host City. San Francisco’s a great city (as others say…not me) Continue reading
Mumble: A referral was returned from the server.
Mumble: A referral was returned from the server.
You may get A referral was returned from the server. when launching Digitally signed applications like Mumble on windows.
This is normally caused by the Digital Signature expiring. You can check
SDN fabric controller for commodity data center switches
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| Figure 1: Rise of merchant silicon |
This article will examine some of the factors leading to commoditization of network hardware and the role that software defined networking (SDN) plays in coordinating hardware resources to deliver increased network efficiency.
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| Figure 2: Fabric: A Retrospective on Evolving SDN |
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| Table 1: Edge vs Fabric Functionality |
BGP Synchronization
The Basic Question >>Why an IGP is necessary to support IBGP and why SYNC is necessary b/w IGP and IBGP .
Lets take rule of SYNCHRONIZATION
A BGP router with synchronization enabled will not advertise its iBGP learned routes to its eBGP peers unless it has learned or verified this route on its routing table through an IGP.
In above Topology ,
R1 R2 R3 R4 are running OSPF as IGP
R1 and R2 are IBGP Peer
R1 R5 and R2 R6 are Ebgp peer respectively.
Lets Have the config of each router
======================================================================
CONFIGURATION
=====================R1=====================
int fas1/0
no sh
ip add 9.9.15.1 255.255.255.0
!
int fas0/0
no sh
ip add 9.9.14.1 255.255.255.0
!
int lo0
ip add 9.9.0.1 255.255.255.255
!
router ospf 9
router-id 9.9.0.1
network 9.9.14.1 0.0.0.0 area 0
network 9.9.0.1 0.0.0.0 area 0
=====================R2=====================
int fas1/0
no sh
ip add 9.9.26.2 255.255.255.0
!
int fas0/1
ip add 9.9.23.2 255.255.255.0
no sh
!
int lo0
ip Continue reading
NANOG 61 – My first!
I have been meaning to write a post about my upcoming NANOG 61 trip, just have not had the time to. Between Cisco Live, Kindergarten graduation, pool installation planning, and life – time was focused on other things. So, here is the post! I have been a member of the NANOG mailing list for a […]Why Cisco Live is awesome!
Having just got back from my second Cisco Live, I couldn’t help but think about what an amazing event it really is. After all 7+ hours on a plane provided me A LOT of time to think. (Now, If only I thought about typing up this blog post on the plane instead of just thinking about […]
Mastering Switching topics in CCIE Version 5
Original content from Roger's CCIE Blog Tracking the journey towards getting the ultimate Cisco Certification. The Routing & Switching Lab Exam
With the new version 5 blueprint there are a lot of version 4 students who are trying to work out what has changed, what is new and what has gone. For new students to Version 5 it is probably just as confusing. One of the changes is the jump to 15 code and the use […]
Post taken from CCIE Blog
Original post Mastering Switching topics in CCIE Version 5
The enterprise virtualization market
I’m often asked by some of my colleagues at Juniper as well as potential customers about whether OpenContrail is applicable to the enterprise virtualization market. This market is today dominated by VMWare while OpenContrail has chosen to focus its energy at OpenStack. The question often comes in the form as to whether I see enterprise adopting OpenStack for virtualization. The answer is, of course, “no”.
To quote an analyst report, “The shift to SaaS is the leading agent of change” in enterprise I.T. This is the main driver of transformation, not OpenStack. While the traditional approach used to be for enterprises to buy software packages and install them on premise, this is now becoming a quaint approach to doing business. I.T. management and operations, like just about everything else, is more efficient at scale. It is simple to understand that it is cheaper to administer 1000 instances of a CRM application “as-a-service” than for 1000 enterprises to do so themselves.
It is also intuitive to understand that the organization that developed a particular software application is then one that can most effectively administer, manage it and maintain it. From an economical perspective, safe some exceptions, if an Continue reading
CCIE Video – from Alexandre Vasseur
Original content from Roger's CCIE Blog Tracking the journey towards getting the ultimate Cisco Certification. The Routing & Switching Lab Exam
I do not know anything about Alexandre Vasseur except for the fact that he has passed his CCIE Lab exam and has made this amazing video to celebrate that fact. We all need small things to keep us motivated along the journey and this video is one of those. Watch the video and feel empowered […]
Post taken from CCIE Blog
Original post CCIE Video – from Alexandre Vasseur