Information-Centric Networking (ICN) is a promising foundation for adaptive video streaming, enabling content-based control and in-network caching to improve Quality of Experience (QoE). Fast-Retransmission Notification Control (FNC) promotes fair bitrate adaptation by selectively notifying disadvantaged clients based on active stream bitrate levels. However, FNC applies uniform control only to low-bitrate clients, leaving high-bitrate clients unmanaged, which may cause queueing delays under congestion. This paper proposes Fast-Retransmission Notification and Explicit Cache Placement Notification (FNECPN), an FNC extension that introduces bitrate-based control by offloading high-bitrate content to router caches via Explicit Cache Placement Notification (ECPN), thereby accelerating low-bitrate delivery. Simulations on a realistic topology show that FNECPN improves fairness and responsiveness, achieving 27% higher QoE, 23% better throughput, and 40% shorter queueing delays compared to state-of-the-art ABR algorithms.

IP anycast is a technology that assigns a common IP address to multiple devices on the Internet. With the recent development of the Internet, the use of anycast technology in the operation of authoritative DNS servers is crucial to ensure stability, reliability, and accessibility. The main objective of IP anycast is to reduce response time for DNS queries. However, in the multisite deployment of anycast, there are many cases where the traffic distribution anticipated for fast query response is not achieved even after the installation of new sites. This paper focuses on the number of hops of DNS queries and makes suggestions to encourage domestic processing of DNS queries sent from within the country for a fast response time. As a result, the domestic consumption rate in the Netherlands is below 70% and the network has room for improvement. And adding a node for JP zone authoritative DNS server in Ireland, where there are many queries to the German and UK nodes, would improve the effectiveness of anycasting.

Today, information centric networking enables adaptive video streaming clients to further improve QoE by applying flexible content-based control. However, an adaptive bitrate algorithm makes a client occupy the bottleneck link at excessively high bitrate, reducing the QoE fairness to other clients sharing the bottleneck link. Then, we propose fairAccel, a method of accelerating bitrate-based feedback control for achieving QoE fairness. fairAccel assigns more bandwidth to clients selecting the lower bitrate while suppressing content requests from clients selecting the highest bitrate on the bottleneck link. In addition, to further improve QoE fairness, fairAccel exploits the symmetric routing of ICN content request / response and applies bidirectional feedback control to the content request / response path. Thus, fairAccel accelerates feedback control by mitigating router queues under control of suppressing content requests before excessive traffic is delivered to the response path. Through simulation experiments, fairAccel improves the average bitrate and further improves QoE fairness for representative ABR algorithms.

The Domain Name System (DNS) plays an important and indispensable role in supporting the modern Internet. Meanwhile, if the DNS message is not encrypted anyway, malicious third parties can exploit the communication channel and cause phishing scams and malware infection. Several countermeasures against this issue already exist, such as Domain Name System Security Extensions (DNSSEC), which guarantees the validity of DNS resource records by adding digital signatures to the DNS messages, and DNS over TLS (DoT), which encrypts a part of the communication channel of domain name resolution process. However, each of these solutions has its own merit and demerit, and neither of them has been implemented on a global scale. Therefore, in this paper, a trustworthy domain name resolution method using TLS certificates with DoT-enabled authoritative DNS servers is proposed. Specifically, the DoT-based name resolution is extended to authoritative DNS servers and the certificate validation is allowed on the end terminals. Moreover, the domain name resolution process is accelerated by obtaining the certificates on the end terminal via the DNS full-service resolver. The evaluation results confirmed that the prototype system worked as designed and it is expected to provide trustworthy domain name resolution service with privacy preservation.

DNS over Transport Layer Security (DoT) has been standardized in the Domain Name System (DNS) to protect the confidentiality of communications between stub resolvers and recursive resolvers. In addition, the standardization for introducing encrypted communication between recursive resolvers and authoritative servers is in progress in IETF. In this paper, we assume that authoritative servers have X.509 certificates to support DoT and propose a mechanism that enables users to determine whether or not a domain name that is similar to or closely associated with a legitimate domain name (possibly a "cousin domain") is actually associated with it.