Hi all, please join us at ICNP this year. Registration is already open and early registration finishes on October 11, 2021. Cheers, Ignacio ICNP 2021, the 29th annual edition of the IEEE International Conference on Network Protocols, is the premier conference covering all aspects of network protocol research, including design, analysis, specification, verification, implementation, and performance. We welcome you all to attend IEEE ICNP 2021, which will be held as a virtual event on November 1-5, 2021. On November 1, we will have five workshops running in parallel starting 7AM Pacific Time. Between November 2-5, we will have the main conference between 7AM and 12PM Pacific Time. The main conference technical program will include a keynote talk by Prof. Donald Towsley of UMass. Amherst; 10 technical paper presentation sessions; and a poster and demo presentation session over the four days (November 2-5). Thanks to generous donations of our sponsors including Cisco, Juniper, and the UTD CS Department, we will have a nominal registration fee for all attendees. In addition, thanks to a generous donation of the IEEE TCDP, we offer student registration awards for a large number of student participants of ICNP to attend the conference free-of-charge. The conference registration site is now available at https://icnp21.cs.ucr.edu/registration.html, and we invite you all to register and joining us for another successful ICNP conference.