公开(公告)号：US20210044678A1

公开(公告)日：2021-02-11

申请号：US16536679

申请日：2019-08-09

Applicant: Cisco Technology, Inc.

Inventor： Prashanth Patil ,  Rajesh Indira Viswambharan ,  Ram Mohan Ravindranath

IPC: H04L29/06 ,  H04L29/12

Abstract: In one embodiment, a domain name system (DNS) service receives a DNS request sent by a client for a particular destination. The DNS service determines that a connection between the client and the particular destination will not support use of the Quick User Datagram Protocol (UDP) Internet Connections (QUIC) protocol. The DNS service generates a DNS response to the DNS request that includes an indication that the connection between the client and the particular destination will not support use of the QUIC protocol within an Extensions Mechanisms for DNS (EDNS) field of the DNS response. The DNS service sends the DNS response, to cause an intermediary between the client and the particular destination to explicitly reject a QUIC protocol connection attempted by the client with the particular destination.