Author Archives: Venkat

SSL/TLS certificates beginner’s tutorial | Talpor Solutions Blog

Posted on September 7, 2017

Source: SSL/TLS certificates beginner’s tutorial | Talpor Solutions Blog Advertisements

Posted in Uncategorized | Tagged | Leave a comment

Generating device configuration using Ansible and Jinja2

Posted on August 25, 2017

Following 3 links pretty much cover everything we need, to generate network device configurations from a  template and variable file. https://pynet.twb-tech.com/blog/ansible/ansible-cfg-template.html https://pynet.twb-tech.com/blog/ansible/ansible-cfg-template-p2.html https://pynet.twb-tech.com/blog/ansible/ansible-cfg-template-p3.html  

Posted in Scripting | Leave a comment

NetNORAD – Facebook TSHOOT tool

Posted on March 22, 2016

Interesting read and video about NetNORAD – a tool used by facebook to detect and isolate network latency/packet drop issues. https://code.facebook.com/posts/1534350660228025/netnorad-troubleshooting-networks-via-end-to-end-probing/   Additional reads: https://github.com/facebook/fbtracert https://github.com/facebook/UdpPinger

Posted in Uncategorized | Tagged | Leave a comment

Accessing HomePC from Anywhere[without traffic passing through a third-party app]

Posted on September 17, 2015

Create a free account with a Dynamic DNS service like noip.com and configure it in the modem. This step is to link dynamically assigned IP from your service provider to a static name. Install any remote sharing app like VNC … Continue reading →

Posted in Uncategorized | Leave a comment

Linux DHCP server config for PXE/BMP boot

Posted on July 11, 2015

Dell switches support Bare-metal provisioning(BMP) where a switch can be provisioned to automatically download image and config file from a remote server and boot up with that image file. In a nutshell, the process involves:

Posted in Force10, Linux | Tagged , , , , , , , | Leave a comment

IPv6 – Notes

Posted on June 11, 2015

IPv6: 128 bits. Represented in hexadecimal format as eight 16 bits segments. Two rules for IPv6 representation: Leading zeros in 16 bits can be represented as single 0. Single contiguous string of one or more segments are all zeros can … Continue reading →

Posted in IPv6, Routing | Tagged , , , | Leave a comment

BGP Notification Message

Posted on May 5, 2015

A BGP notification message is sent when an error condition is detected by the BGP process. The TCP connection with that BGP peer is closed after sending the notification message. Usually, the BGP process will log this notification in syslog, … Continue reading →

Posted in bgp, Force10, Routing | Tagged , | Leave a comment

Python Script that SSH to a switch and execute commands for ‘x’ times

Posted on April 10, 2015

Below is a sample python code that can login to a switch via SSH and gather few command outputs and display it on console. SSH sessions are repeated for ‘x’ number of times. Paramiko SSH module is used in this … Continue reading →

Posted in Scripting | Tagged , , , , | 2 Comments

Network Troubleshooting Methods

Posted on March 25, 2015

Troubleshooting a network connectivity issue is quite challenging in a complex Data Center Network with live production traffic. Below are few basic methods to identify a node in the traffic path that drops packets which would cause network connectivity issues. This procedure … Continue reading →

Posted in Case Study | Tagged , , , , , , , , | 1 Comment

NPG (NPIV Proxy Gateway) Mode Vs Full Fabric Mode in FCoE

Posted on March 7, 2015

In this article, I will be discussing about two different modes that an FCF switch can operate in FCoE topology. FCF(FCoE Forwarder) is a switch that supports both Ethernet(FCoE) functionality like FIP, DCBx, LAN protocols and FC(Fiber Channel) functionality like … Continue reading →

Posted in FCOE | Tagged , , , , | Leave a comment