Viva España – Heading to HP Discover
It’s ironic to end the 30 day challenge by not posting for a short while, but what can I say? I’ve been very busy! Today I’m traveling to Barcelona to attend the HP Discover 2014 Barcelona event as a guest of HP’s Independent Blogger Programme. It looks like HP will be keeping us busy while we’re there, so I would predict quite a few posts coming out of this trip in the near future and I’m looking forwarding to hearing more about what HP is up to.
In early October I posted about HP’s SDN Mojo and OpenFlow deployment at Interop after they presented to us as part of Tech Field Day Extra. In that post I was impressed that HP had moved from talk to action as regards OpenFlow. I wonder what else HP has up its sleeves?
Do take a moment to check out HP Discover Barcelona 2014 and look at the Content Catalog. If nothing else, check out the SDN sessions in the content catalog. Hopefully that link will take you directly to the right results; there are some interesting sessions on that topic alone.
Like other events, HP will also be streaming some content live for Continue reading
Cisco VIRL goes public
It’s been a few years since the first whispers started leaking out about Cisco building an in-house software emulation platform. A Dynamips/GNS-like program that natively caters for the needs of Cisco students and engineers in the field has been a hot topic for a long time. Early last year Cisco made official mention that they […]
ExtremeXOS, Arista and Cisco vIOS-Layer2 Virtual GNS3 Lab
ExtremeXOS is a network operating system used in Extreme Networks network switches. Virtualized version of ExtremeXOS - EXOS virtual machine vmdk image can be used to build virtual lab without need to use hardware switches. Although ExtremeXOS virtual machine can be downloaded for free only certain features are known to work. For this reason software should not be used for testing any actual networking setups or performance tests.
The tutorial consist of two parts. The part one explains how to configure Qemu emulator to run ExtremeXOS virtual machine. In part two, ExtremeXOS VM is connected to virtual lab run by GNS3 software. In this lab, features such as VLANs, 802.1q trunks and OSPF routing protocol are tested between multilayer switches from different vendors - Cisco, Arista and Extreme Networks.
Host Software and Hardware Requirements
- Linux x86-64,
- Qemu emulator version 2.1.2 (qemu-system-x86_64, qemu-system-i386 ) or later,
- GNS3 version 1.1 or later,
- RAM - at least 4 GB,
- CPU with hardware virtualization support (VT-x or AMD-V)
Virtual Machines Software and Hardware Requirements
- ExtremeXOS VM 15.3.2, exosvm.vmdk,
RAM 256 MB ,CPU x86-64
Qemu additional parameters: -nographic -enable-kvm - Vios_l2-ADVENTERPRISEK9-M), Version 15.0, vIOS-L2.vmdk,
RAM 512MB, Continue reading
PQ Show 37 – Fancy Network Adapters with Solarflare
As servers get faster, network speed and latency is impacted by the performance of network adapters inside the server. There are many after market options for radically improving the throughput and latency performance and we discuss them in this 20 minute show.
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The post PQ Show 37 – Fancy Network Adapters with Solarflare appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Mininet Internals and Network Namespaces
Mininet is a very powerful virtual network emulation system that’s generally used in SDN development environments. With Mininet, a complex network with hundreds of switches can be simulated in a laptop and this opens up testing real-life network usecases. I have covered Mininet usage in 1 of my earlier blogs on tools used with Opendaylight. … Continue reading Mininet Internals and Network Namespaces
phpipam twitter account
I have opened a twitter account to deploy news etc easier, if you like you can follow @phpipam on twitter. I was hoping to get at least guys using development releases to help me testing.brm
QFX5100 default config
Just for reference, here’s the config a QFX5100 comes with out of the box.
Notes:
Initially the switch tries to get an IP address on the vme0 and irb interfaces so that it can do an auto-image-upgrade, but that failed in the lab since no server (nor the appropriate DHCP options) were available. The result was an irritating repeated message on the console about this. To get rid of that, “deactivate chassis auto-image-upgrade”. This is probably for use if the QFX switch is part of a Q-Fabric – presumably it is trying to upgrade itself over the management network to the version the rest of the QFabric is running.
All interfaces are in the default VLAN, even though their membership is not reflected in the config.
All interfaces have RSTP enabled.
Unfortunately all interfaces are listed twice if they’re dual-mode (i.e. SFP or SFP+). This makes the initial config very long. Obviously this can be deleted.
version 13.2X51-D20.2;
system {
host-name QFX5100-4;
arp {
aging-timer 5;
}
root-authentication {
encrypted-password "REMOVED"; ## SECRET-DATA
}
login {
user imtech {
uid 2000;
Continue reading
Network Break 23
This week we are sponsored by Solarwinds NPM and topics: its Net Neutrality, Facebook's Data Centre Design, Resellers and SDN, Amazon tilts at the Enterprise, Project Squared, and Too Many Salesman.
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The post Network Break 23 appeared first on Packet Pushers Podcast and was written by Greg Ferro.
Ethernet Economiser aka RJ45 splitter
Just a quick post since I speak with many network engineers and I notice some confusion about this topic. Are all 4 pairs of an Cat5e cable used? The answer is.. it depends. For gigabit speed 1000T all four pairs…Can You AS-Prepend a Single Host Route?
Someone recently sent me this question:
Is it possible to prepend one IP address from a public IPv4 segment?
I don’t want to know what crazy stunt this engineer was forced to pull off, but just in case you land in a similar quandary here’s how you shoelace yourself out of it.
Read more ...Cisco Nexus 9000 training DCINX9K
This week I attended a two days training of Cisco DCINX9K. The training is focused on Cisco Nexus 9000 switches in NX-OS mode. NX9K can run two different software images, the full ACI image with all the cool SDN stuff…Happy Thanksgiving!
Today, We wish and hope all of our friends and students have a very Happy Thanksgiving!
Installing CoreOS
If you haven’t heard of CoreOS it’s pretty much a minimal Linux distro designed and optimized to run docker. On top of that, it has some pretty cool services pre-installed that make clustering CoreOS pretty slick. Before we go that far, let’s start with a simple system installation and get one CoreOS host online. In future posts, we’ll bring up more hosts and talk about clustering.
The easiest way to install CoreOS is to use the ‘coreos-install’ script which essentially downloads the image and copies it bit for bit onto the disk of your choosing. The only real requirement here is that you can’t install to a disk you’re currently booted off of. To make this simple, I used a ArchLinux lightweight bootable Linux distro. So let’s download that ISO and get started…
Note: I use a mix of CoreOS VMs and physical servers in my lab. In this walkthrough I’ll be doing the install on a VM to make screenshots easier. The only real difference between the install on either side was how I booted the ArchLinux LiveCD. On the virtual side I just mounted the ISO and booted Continue reading
Thanks for being there!
A third of my readers are celebrating Thanksgiving today, and I’d like to use the opportunity to say what I always wanted to say but somehow never got to it. Let’s make it short: Thank you! Without you, there would be no ipSpace.net.
Read more ...IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun
Orhan Ergun and Jeff Doyle talks about IPv6 design and deployment considerations in the Enterprise networks. They strongly advice you to consider IPv6 deployment in your network. Why IPv6 in the Enterprise , what are the real business drivers for the IPv6 ? Growth of IPv6 in the Enterprise Networks Jeff Doyle’s advices to Service […]
Author information
The post IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun appeared first on Packet Pushers Podcast and was written by Orhan Ergun.
IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun
[player] Orhan Ergun and Jeff Doyle talks about IPv6 design and deployment considerations in the Enterprise networks. They strongly advice you to consider IPv6 deployment in your network. Why IPv6 in the Enterprise , what are the real business drivers for the IPv6 ? Growth of IPv6 in the Enterprise Networks Jeff Doyle’s advices to […]
The post IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun appeared first on Packet Pushers.
IPv6 in the Enterprise by Jeff Doyle and Orhan Ergun
[player] Orhan Ergun and Jeff Doyle talks about IPv6 design and deployment considerations in the Enterprise networks. They strongly advice you to consider IPv6 deployment in your network. Why IPv6 in the Enterprise , what are the real business drivers for the IPv6 ? Growth of IPv6 in the Enterprise Networks Jeff Doyle’s advices to... Read more »War Stories: Unix Security
A different kind of war story this time: Unix security blunders. Old-school Unix-types will mutter about how much more secure Unix systems are than Windows, but that glosses over a lot. In a former life I worked as an HP-UX sysadmin, and I saw some shocking default configurations. I liked HP-UX – so much better laid out than Solaris – but it was very insecure by default. Here’s a few things I’ve come across:
Gaining Root
We’d lost the root password for a test HP-UX server. We had user access, but not root. The server was located in a different DC, and we didn’t really feel like going and plugging in a console cable to reset the root password. So we started looking around at how we might get access. After a while I found these two things:
- Root’s home directory was ‘/‘ – this was the default on HP-UX
- The Remote Login service was running
And now for the kicker:
hpux lhill$ ls -ld / drwxrwxrwx 30 root wheel 1020 1 Nov 13:57 /
Put those together, and you can see it’s easy to gain root. All we needed to do was create /.rhosts, and add whatever Continue reading
How to Customize CORE Network Emulator Services
When running services on nodes in a CORE Network Emulator scenario, we may wish to customize the services configurations.
Some reasons why a user may customize CORE services are:
- Set up complex network emulation scenarios by adding more configuration information to required services
- Simplify network emulation scenarios by removing default configurations from CORE Services
- Enable the CORE GUI to execute user-generated scripts or commands on network nodes while running a simulation
- Save customized configurations on each node in the CORE Network Emulator configuraion file.
To show how to customize CORE Services, we will work through a detailed tutorial that shows how to customize the IPForward service. We will work through the same steps required to customize any other CORE Service.
The IPForward CORE Service
The IPForward CORE Service provides a script that runs when the node starts in a simulation scenario. The script sets the IP Forwarding kernel parameters so that the node will forward packets from one port to another, according to the routing table on the node. The IPForward script is a default service on the Router node type.
Why customize this service?
The default IPForward CORE service has limited functionality: it can start IP forwarding on a Continue reading