ENE-NG and GNS3 – Speed and Duplex Mismatch
KB ID 0000983 Problem I don’t know why this happens sometimes with GNS3, and EVE-NG but occasionally I will get a connection between two devices that constantly complains. %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on {interface-name} (not half duplex), with {host-name} {interface-name} (half duplex). For the uninitiated, a speed/duplex mismatch, usually happens when both ends of the link are set differently, or (more...
Mac OSX – GNS3 Connecting To the Internet
KB ID 0001170 Problem I have a love hate relationship with GNS3, I appreciate it’s brilliant, (when it works). I also appreciate that it’s free, and people put a lot of effort into its development for very little reward. But when I try to do simple things, like connect my projects/labs to the internet and it’s massively overcomplicated I get pretty exasperated. With Windows this is easy, (I’ve probably blogged...
GNS3 Update – Could Not Find a VM Named ‘GNS3 VM’
KB ID 0001160 Problem GNS3 had nagged me the last few times I tried to use it about upgrading, so I downloaded and installed the update and it stopped here; Could not find a VM named ‘GNS3 VM’ is it imported in VMware or Virtualbox I use both VMware Fusion and Virtualbox. But Virtualbox looks after all the VM’s I use in GNS3. Either way I did not know what I was looking for, and the download (and application folder)...
Route Summarisation with EIGRP
KB ID 0001149 Problem I’ve already written a post that lets you calculate a route summarisation. So now you have a method of advertising your routes more efficiently, what do you do with it? Well I’m at the EIGRP point in my studies so here’s how to implement it with EIGRP. To demonstrate I’ve built the above network on GNS3, there is a loopback interface on the routers for each of those networks. Solution...
GNS3 – Initial Setup, Adding Routers, Hosts, and ASA Firewalls
KB ID 0000927 NOTE: THIS ARTICLE IS FOR THE OLD VERSION OF GNS3 GO HERE FOR THE NEW ONE Problem I dip into GNS3 every so often, (depending on what I’m working on). And each time I install it, I spend just as long remembering how to set it up, as I do using it! So, if for no other reason than I can use this page as a reference in future, here’s how to get it up and running. Solution Note: At time of writing he latest...
GNS3 – Initial Setup, Adding Routers, Hosts, and ASA Firewalls
KB ID 0001079 Problem I dip into GNS3 every so often, (depending on what I’m working on). And each time I install it, I spend just as long remembering how to set it up, as I do using it! So, if for no other reason than I can use this page as a reference in future, here’s how to get it up and running.</p? Solution Note: At time of writing the latest version is 1.3.6</p? 1. Download GNS3, I usually accept all the...