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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 for which I was included in their Top 3 ‘How to’ posts in 2021 with my article “Edge router and BNG optimization”. Also found it pretty cool to have had my IPv6/NDP article covered by Packet Pushers in this podcast.

I additionally also talked about my IPv6 Architecture article on a Packet Pushers podcast here.

In addition to my day job, I also selectively (occasionally) 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

January 2021 – September 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.
  • In contact with folks at Telcos and various ISPs, pushing best practices towards them directly too.

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).

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 and, 2023. Unauthorized use and/or duplication of this material without express and written permission from this site’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Daryll Swer and with appropriate and specific direction to the original content.