Create or Edit a File on Cisco IOS Flash

There is always the option to edit a file locally on your computer in notepad++ and then upload it to Cisco device.

With this trick, you can write or edit a file from Flash memory directly from Cisco IOS console. If you need it for whatever reason, maybe to change something in the config file or something else, this is the way to do it.

I was using if for my next article lab where I needed a file on the flash with at least 1600 bytes so I can pull it from neighbouring router with HTTP and check some details in new TCP connection. It was faster to just create the file directly on the router flash and not creating it on my laptop and then transferring it with FTP or TFTP.

| Continue Reading.. |

I Became Cisco Champion for 2018

I just received an e-mail from Cisco with the notice that I was elected Cisco Champion for 2018.

As Cisco says:

Cisco Champions are a group of highly influential technical experts who generously enjoy sharing their knowledge, expertise, and thoughts on the social web and with Cisco. The Cisco Champion program encompasses a diverse set of areas such as Data Center, Internet of Things, Enterprise Networks, Collaboration, and Security. Cisco Champions are located all over the world.”

I must say that last 7 years of writing this blog was the primary reason why one should pick me for this flattering badge.

I’m following some of the most active Cisco Champions on Twitter for years.

| Continue Reading.. |

Link Aggregation – LACP Protocol

EtherChannel enables bundling multiple physical links connecting same devices into a single logical link. I will try to show you how it is configured and how it works.

The issue with one uplink

I made an example with 8 clients connected to two Cisco 3850 switches. For start, those two switches are connected together with 1G copper on Interface Ge1/23. The clients are also connected to 1G ports. In this case, when all of those four clients on the left side start simultaneously sending traffic at full speed to different computers on the right side, they will congest the uplink between switches and some traffic will be dropped.

| Continue Reading.. |

Check Point Firewall VM Disk Resize

It is related to Check Point MGMT VM with R80.10 in my story, but you would as well want to resize Check Point gateway firewall hardware box or VM.

I was searching for a simple solution and found different ones that didn’t work for me, so here are the steps that you need to go through when you resize your CheckPoint VM disk in vCenter and then need to expand the partition inside Check Point VM in order to use the additional space.

Of course, you did choose too small HDD for your VM when you created it and now you cannot upload some hotfixes or vSEC gateway files to it because you don’t have enough space.

Get to vCenter and shut down the VM.

vCenter VM Shutdown

Get more GB to your VM and power it back up.

vCenter VM HDD Space Increase

| Continue Reading.. |

Celebrating 6 Years

Last month I celebrated 6 years of writing my blog.

This project reached yesterday his most visited day in history with more than 1500 visitors and more than 31K all together in November. Nice to finally see someone actually reading my rumblings.

It was and still is hard work of editing old posts making them better and finding new interesting stuff to write about.

Blog is about computer network technologies, you know, the stuff that makes thing get to you and appear on your device’s screens so you can stare at it all the time 🙂

Some other interesting trivia:

  • I have 221 posts published currently.
  • I have also more than 300 drafts that may get published. Some things get old before I get to write them so I just skip those.
  • It takes me approximately 10 to 16 hours to write a post, not counting research and draft creation before starting the final edit.
  • I still use paper and coloured pencils to draw all the schemes used on the blog, same as when making first drafts of my future network designs.
  • My blog is using few banners to be able to pay for itself, so it is earning more or less the money I need to run it.
  • From a technical side, it is a small but optimised Linux VPS build by myself from scratch using some commercially available (and paid) solutions to run fast, load pages flash fast and never go down.

Thanks to all the readers and supporters 😉