A cisco vswitch that can be used instead of the default VMware DvS to have a similar environment to that of Cisco physical NXOS switches. The control and packet communication can either be carried over VLANs in Layer2 mode or IP addresses in Layer3 mode. The default and Cisco recommended solution is L3 mode.
Local and Distributed vSwitches server the same purpose as physical switches allowing for VM vNICs to be assigned to specific VLANs. In a production environment it is usual to define a local vSwitch on each ESX host for management and backdoor and have distributed vSwitches shared between hosts for VMs.
I was recently faced with a challenge whereby I needed to inject 30,000 BGP routes into a test environment for a DOCSIS 3.1 POC. Typically I would use IXIA to form the BGP session and inject the routes. However, all of our IXIA testers were in use thus I needed a quick alternative.
I was already aware of BIRD and it’s use as a route server in a number of IXP environments so figured it would be a good fit. The following steps detail how to install BIRD on Ubuntu and how to instantiate a BGP session with a Juniper MX router.
For more info on BIRD check here
For this install I’m using a VM running Ubuntu server 12.04LTS:
lab@ubuntu-server1:~$ lsb_release -aNo LSB modules are available.Distributor ID: UbuntuDescription: Ubuntu 12.04.3 LTSRelease: 12.04Codename: precise
First up we need to enable Linux to support IPv4 forwarding. Two options here; we can either use the sysctl net.ipv4.ip_forward=1 command, although this setting will reset when the server is rebooted. Alternatively we can modify /etc/sysctl.conf to make the change permanent. Edit /etc/sysctl.conf and Continue reading
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Russ White explains why thinking is important.
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Beware of destruction of service (DeOS) attacks.
Risk Management in Submarine Cable System Submarine networks carry over 99% of the world’s Intercontinental electronic communications traffic. There is misconception that Satellites carry data from continent to continent. If we ask anyone in the world, 95% of people give answer as satellites carry international traffic. This is absolutely wrong. The Internet, International […]
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Hi folks, one of the many things that I’ve been working on behind the scenes has finally seen the light of day: Best Practices for Red Hat Virtualization 4. This takes over where the product documentation leaves off.What I mean by that is this:
The product documentation is (mostly) great about telling you “how” to do the many activities related to deploying Red Hat Virtualization.
This new document tells you “why” to do many of the activities related to deploying Red Hat Virtualization. It does NOT have code examples, but it DOES have lots of things to consider. Things like:
In other words, when you go to plan out your deployment, this is the document that you want to read before you paint yourself into a corner. Many of the items are best practices, like “don’t turn off SELinux”. Others are more considerations and implications, like “NAS or SAN”.
If this is something you’re interested in, you can download it here:
Best Practices for Red Hat Virtualization 4
Hope this helps,
Captain KVM
The post Best Practices for RHV Continue reading
Anycasting IP space has become quite a meme in the networking world in the last few years, with it being used sparsely in the past for UDP based services like DNS. Now it’s being used for TCP based services too,
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Quieter week as I'm travelling
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See how to configure a Cisco switch using Paramiko, a Python implementation of Secure Shell v2.
Digital transformation depends on the speed and agility provided by API-based ecosystems of cloud and DevOps.