Hamilton Institute NetLab

Research

TCP Congestion Control

• H-TCP: TCP Congestion Control for High Bandwidth-Delay Product Paths
• Experimental Evaluation of TCP Protocols
• Mathematical Modelling of Network Dynamics
• Link provisioning, buffer provisioning and AQMs
• Delay-based congestion control

Wireless Networks

• Modelling 802.11 WLANs (incl. 802.11e and mesh)
• TCP over 802.11 WLANs
• Supporting Voice and Data Traffic in 802.11e WLAN’s
• Link provisioning, buffer provisioning and AQMs
• Achieving high throughput at the MAC layer – 802.11n
• Channel Allocation in WLANs
• Measuring channel quality

Mesh Networks

• Fairness in WLAN Mesh Networks
• Joint Routing and Coding in WLAN Mesh Networks

Facilities

• High-speed Wired Networking Testbed
• 802.11a/b/g, 802.11e Wireless Testbed (20 nodes)
• 802.11a/b/g, 802.11e Wireless Mesh Testbed (15 nodes)

Software

If you find our code useful we would appreciate that you reference and acknowledge us in your paper.If this code is modified or improved we ask that the modifications be shared with us.

All of this code is released under the GNU GPL v2.

H-TCP Linux Implementation

The HTCP algorithm is described our PFDLnet 2004 paper and Internet Draft draft-leith-tcp-htcp-00.txt. More details here.

• 2.6 H-TCP patches with SACK processing performance improvements (for Linux 2.6.6)
• H-TCP is available in the Linux kernel as of 2.6.13, but an error was introduced that was not fixed until 2.6.16. If you are conducting tests of H-TCP, please use Linux kernel version 2.6.16 and above or contact us for the appropriate patch to the previous versions.
• A report on the 2.6.6 patches for SACK performance improvement is also available (349KB Compressed Postscript).
• Older work for 2.4 H-TCP patch (Linux 2.4.23,
  including changes to Linux TCP implementation to improve performance in high-speed networks -
  see report for details).

If you have a question or an issue with these patches you can contact Baruch Even.

H-TCP ns-2 Implementation

• Latest ns-2 simulator patch.

Alternate AIMD – HI2005 experiments

• Alternate AIMD patch (version 0.6)

NS Scripts for TCP benchmarking – See also experimental measurements

• NS scripts to run a battery of simulation tests covering the same range of conditions as in Experimental evaluation of high-speed congestion control protocols, Li, Y.T, Leith,D., Shorten,R. Transactions on Networking, 2007.

BIC in Linux fixes

• The BIC protocol as implemented in the Linux kernel has a bug which makes it too aggressive, We provide:
  • detailed report, and a
  • patch for Linux 2.6.6 and above

People

• Douglas Leith
• Robert Shorten
• Venkataramana Badarla
• David Malone
• Ken Duffy
• Vijay Subramanian
• Rade Stanojevich
• Tianji Li
• Laetitia Chapel
• Lukasz Budzisz
• Ian Dangerfield
• Qizhi Cao
• Xiaomin Chen
• Minyu Fang
• Kaidi Huang
• Hanghang Qi

Acknowledgements

The support of the following is gratefully acknowledged:














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