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About

Please note, I am currently fully committed to my current day job and no longer accepting new freelance clients. If you are looking for professional help, feel free to ask other network engineers in our public Telegram group.

I may resume freelancing again in the future, full-time, keep an eye on my website and/or socials 🙂

This website’s hosting is provided by my friend and very first supporter of my work, Debosmit Majumder.

As an IT and networking enthusiast, I am intrigued about all aspects of computer networking and network engineering and work full time as a network engineer.

I am also grateful to have had the opportunity to share some of my knowledge and insights through my writing via the APNIC blog. Two of my articles made it to their “Three of the best” posts in 2021 with my “Edge router and BNG optimization” article, and in 2023 with my “IPv6 architecture and subnetting guide” article—I additionally talked about my IPv6 Architecture article on a Packet Pushers podcast here.

Also found it pretty cool to have had my IPv6/NDP article covered by Packet Pushers in this podcast.

In addition to my day job, I also used to selectively offer consultancy services to ISPs around the world, helping them implement best practices and optimise their configurations.

In my spare time, I enjoy sharing my knowledge and insights with others, and I publish a variety of networking-related content on this site for Telcos and ISPs. I also enjoy photography and music, and I am the proud operator of my own network (AS149794).

I am always open to new opportunities and connections with those who share my passion for computer networking.

Work background

October 2023 – Present
Network Manager | Mile High Networks (AS395927) & Glacier Broadband (AS395842)

Responsible for network architecture, design implementation, R&D, technical decision-making. More details to be added in the future.

July 2022 – August 2023
System & Network Engineer | cldin (AS48635)

A heartfelt shoutout to Wido den Hollander (former MD/CTO of cldin) who gave me the opportunity and served as my technical mentor during my time at the company, from whom I learnt a great deal on best practices for networking from both operational and business standpoint, ranging from network architecture to handling of maintenance, fire fighting and dealing with layer 8 problems.

  • Everything is IPv6-first at AS48635.
  • Designed and implemented a new IPv6 architecture from scratch.
  • Troubleshoot and resolved complex network issues in a multivendor environment.
  • Worked with a variety of vendors, including Juniper, Arista, Cumulus Linux, Cisco, MikroTik, and Ubuntu/FRR.
  • Implemented security best practices and modernised the out-of-band network.
  • Handled some network documentation
  • Worked closely with other teams for inter-team disciplinary related works.
  • Contributed to the development of the company’s network strategy.
  • Improved network efficiency and performance by implementing best practices and relevant RFCs.
  • Conducted a technical workshop on MikroTik-specific implementation(s).

January 2021 – August 2023
Independent Consultant

  • Operating AS149794 for non-profit R&D.
  • Collaborating with orgs that are interested in non-profit R&D to benefit the internet community.

Selectively providing consultancy services to ISPs such as:

  • Deploying CGNAT with best practices.
  • Firewalling and bogon filtering.
  • Architecting and deploying IPv6.
  • Implementing best practices for MTU.
  • Assisted in deploying new technology such as Docker.
  • Encourage operators to aim for symmetric routing and topology when feasible.
  • RPKI.
  • Encouraging up-to-date IRR information for best practices.

May 2021 – June 2022
Technical Support Engineer | Civo Ltd.

Big shoutout to Sam Weston for introducing me to Mark Boost, who in turn gave me the opportunity.

  • Frontline Support (L1).
  • Direct interaction with the customers, either via Intercom or the Civo public Slack community.
  • Basic diagnostic and preliminary checks for the issues reported by the customers.
  • Escalate issues to the appropriate team where and whenever required.
  • Work hand-in-hand with other support staff for trickier and more complex issues.
  • Set up RFC8805 (Geofeeds) for Civo’s Prefixes.

November 2020 – January 2021
Intern | SkyBroadband Services, Shillong

Big thanks to Varun Singhania for giving me the opportunity

My contributions were:

  • Assisted in deploying RFC4638 which enabled customers to push 1500 MTU over PPPoE thereby eliminating packet fragmentation and improving overall network performance.
  • Assisted in identifying security flaw in RADIUS configuration that allowed anyone outside the local network to login the web dashboard of any user’s account.
  • Assisted in discovering an MTU negotiation issue with certain make/model of ONT devices that prevented jumbo frames from being transmitted.

Volunteering work

November 2021 – May 2022
Program Committee Member | INNOG

Daryll Swer's network engineering blog.