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GNS3 Cloud and VMware Host-Only Adapter

When you research how to connect a VMware guest to GNS3, you will find many articles advocating the use of a Microsoft loopback adapter. Here is one such example from Intense School. Equally you will find many requests for help from people who ran into trouble setting up such such a configuration. Reasons for loopback connectivity failure include Microsoft firewall issues, MAC address issues and IPv4 configuration issues. I typically create a host-only network when I am testing or using VMs as I do not have a need for external connectivity for such VMs. I prefer not to use the

Exploring Cisco UCS Emulator Internals

Cisco UCS (Unified Computing System, codenamed Project California during development) was introduced in 2009. It was originally developed as a data center server technology optimized for VMware virtualization workloads, but nowadays is used in many mid-size and large enterprises. One of the key advantages of UCS from a system administration perspective is the radical reduction in system management points to a single management point called the UCS Manager (UCSM) which is implemented as an NX-OS kernel module in a Cisco Nexus 6000 series Fabric Interconnect (FI) switch. A FI is essentially a Top-Of-Rack switch as far as UCS is concerned.


NETCONF (Network Configuration Protocol) is a network management protocol developed and standardized by the IETF Netconf Working Group. It was first published in December 2006 as RFC 4741 with a revised version published in June 2011 as RFC 6241. It provides mechanisms to install, manipulate, and delete the configuration of network devices. The same IETF Working Group also produced supporting RFCs for various transport mappings, including: RFC 4742 – Using the NETCONF Configuration Protocol over Secure SHell (SSH). Obsoleted by RFC 6242 (2011) which introduced a new framing mechanism to address some potential security issues with the initial design RFC