Advanced Networking

Advancing state of the art high-performance computing, communications and data analytics.

The Advanced Networking Group at PSC conducts research on network performance and analysis in support of high-performance computing applications. This group also develops software to support heterogeneous distributed supercomputing applications and to implement high-speed interfaces to archival and mass storage systems.

 Work done by this group includes TCP implementations, TCP tuning, and software to monitor and improve network performance.


Research Projects

3ROXThe Three Rivers Optical Exchange (3ROX) is a regional network aggregation point, also called a GigaPoP, providing high speed commodity and research network access to sites in western and central Pennsylvania and West Virginia.

HPN-SSH HPN-SSH is a series of modifications to OpenSSH, the predominant implementation of the ssh protocol. It was originally developed to address performance issues when using ssh on high speed long distance networks (also known as Long Fat Networks: LFNs). By taking advantage of automatically optimized receive buffers HPN-SSH could improve performance dramatically on these paths. Later advances include; disabling encryption after authentication to transport non-sensitive bulk data, modifying the AES-CTR cipher to use multiple CPU cores, more detailed connection logging, and peak throughput values in the scp progress bar.

Web10GWeb10G promises innovations in performance, stability, optimization, and network diagnostics  to anyone who wants to fully exploit modern high bandwidth connections.   It provides users with have real-time statistics about their network connections, and allows them to fine-tune some characteristics of the connection to improve performance. Join the Web10G team on our mailing list, view the  archives  or visit  Web10G online.

KINBER and PennRENThe Keystone Initiative for Network Based Education and Research (KINBER) serves as coordinator for the construction and management of a Pennsylvania-wide fiber optic network, PennREN (Pennsylvania Research and Education Network).  PennREN will be accessible to educational, research, health care, and economic development partners seeking to aggregate services for their members and subscribers at affordable cost.


Networking Tools, Software, and Information

TestRig 2.0 – A bootable Linux ISO used to automatically and conveniently generate network performance data for analysis by PSC engineers.

High Performance Enabled SSH/SCP – HPN-SSH – Maximize the performance of secure copying and connections between hosts on a high-performance network.

Enabling High Performance Data Transfers


TCP Performance Tuning

Poll-Switch – SNMP poll a layer-2 device – Retrieving host and port information from a layer-2 switch running an SNMP agent.

Mac-Scan  Scan hosts on a VLAN or network for vulnerabilities

IP-Utils – Enable data communication via a simple API for various IP-based networking protocols

TCP Performance Tuning

      • Presentation by Jamshid Mahdavi at the High Performance Data Networking conference at Northwestern University, 4/97
      • Presentation by Jeffrey Semke at the vBNS Techs workshop at Carnegie Mellon University, 5/98

Networking Research Papers

Research Papers


Previous work

DANCES – The DANCES project (Developing Applications with Networking Capabilities via End-to-End SDN) is  developing tools to allow the scheduling of network resources much as compute resources are scheduled now, with the aim of reducing data transfer bottlenecks, a serious hindrance to scientific research.

NPAD/pathdiag – Automatic diagnostic server for troubleshooting end-systems and last-mile network problems.

SAMI (NIMI) – Creating a Secure and Accountable Measurement Infrastructure

Web 100 – Created to address automatic TCP buffer tuning.