One tunnel is (often) enough
Simon Peter, Umar Javed, Qiao Zhang, Doug Woos, Thomas E. Anderson, Arvind Krishnamurthy · 2014
A longstanding problem with the Internet is that it is vulnerable to outages, black holes, hijacking and denial of service. Although architectural solutions have been proposed to address many of these issues, they have had difficulty being adopted due to the need for widespread adoption before most users would see any benefit. This is especially relevant as the Internet is increasingly used for applications where correct and continuous operation is essential.