Introduction In this post we will configure voice vlan on HPE OfficeConnect 1920S switch. The switch will be used for connecting Cisco 8851 IP phone, which will detect the Voice VLAN and get an IP address from the correct VLAN. The PC connected through the IP phone will remain in a Data VLAN. The exact
Introduction If you are getting error similar to this “Unable to negotiate with X.X.X.X port 22: no matching cipher found. Their offer: aes128-cbc,3des-cbc,aes192-cbc,aes256-cbc” you might want to read this post to understand the problem and see how you can solve it. I’m using Linux Mint but this article is applicable to any other Linux distribution.
Introduction In this article we will setup an IRF stack with two HP 5130 switches that run Comware OS. What is IRF? IRF (Intelligent Resilient Framework) is a proprietary virtualization/stacking technology used in some HPE switches. It has been developed originally by H3C, but later HPE acquired H3C. IRF allows us to interconnect several switches
Introduction In this article we will see how we can fix the problem if Cisco 500 or 300 series SMB switches don’t boot because of either corrupted or missing firmware image. I will be using Cisco SF500-48P but the procedure should be the same for all Cisco 500 and 300 series switches. Problem description Your
Introduction In this post we will learn how to install and run Cisco router as a virtual machine. Cisco has a special product called CSR (Cloud Services Router) 1000v for deploying routers as virtual machines. You can use these VMs for testing and learning purposes. Cisco supports all popular cloud and virtualization platforms, but I
Introduction You might be getting this error “A required disk image was missing” while deploying a new virtual machine from CSR 1000v OVA file. You can ignore this error, but the router will not boot after you power it on. I have written below how I managed to deploy CSR 1000v using OVA file and
Introduction In this post we will configure port forwarding on a Fortigate firewall running FortiOS 5.4. What is Port Forwarding? Port forwarding is a feature on the routers/firewalls that allows devices behind the NAT to be accessed by external devices. In other words, if you want anyone on the Internet to access a service (e.g.
What is Mininet? Mininet is a software that emulates virtual network environment with OpenFlow support. It is great for learning, prototyping and testing SDN features and applications. How to install Mininet? There are several ways you can install Mininet. The easiest and recommended one is to go to https://github.com/mininet/mininet/wiki/Mininet-VM-Images and download the image for your
Introduction This post is about tcpdump – packet analyzer that comes preinstalled with any modern Linux distribution. tcpdump allows us to capture packets and either display them in real time or save them to a file for later analysis. We will look at several examples of using tcpdump to learn which options it has and
Cisco UCS C220-M5 server boot options missing. Today I have unpacked and installed a brand new Cisco C220 M5 server for one of our customers. That was, by the way, the first M5 server I worked with. I did everything as usual: Assigned IP address to CIMC Configured RAID array Installed ESXi 6.7 After I