High-speed TCP eases LAN congestion

NETWORK WORLD NEWSLETTER: NETWORKING TECHNOLOGY UPDATE
10/03/05

Dear networking.world@gmail.com,

In this issue:

* HS-TCP is an update of TCP that reacts better when using large
congestion windows on high-bandwidth, high-latency networks
* Links related to Networking Technology Update
* Featured reader resource
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Today's focus:

High-speed TCP eases LAN congestion

By Mark Day

TCP sometimes gets a bad rap because of the way its
congestion-control algorithm hunts for bandwidth haphazardly and
backs off conservatively at any sign of congestion. A properly
tuned TCP implementation running over a well-engineered network
can readily achieve throughputs of up to 100M bit/sec, even with
very high latencies. But beyond 100M bit/sec in a typical
high-latency environment, performance starts to degrade.

However, there is an elegant and easily implemented fix in a
protocol enhancement called High-speed TCP (HS-TCP ). HS-TCP is
an update of TCP that reacts better when using large congestion
windows on high-bandwidth, high-latency networks.

Documented in IETF RFC-3649 , HS-TCP has experimental status
rather than being on a standards track. Nevertheless, it is
stable and useful, and is likely to be incorporated into future
standards - just as with previous successful experimental
modifications to TCP.

* A window into the problem

TCP allows applications to communicate reliably over unreliable
IP packet networks and permits sharing of network bandwidth
across connections in a roughly fair fashion. It does so by
having each TCP sender dynamically adjust its transmission
window, which represents the maximum amount of unacknowledged
data that can be in transit in the network at any given time.

For more on HS-TCP, go to:
<http://www.networkworld.com/nltechupdate7936>

The top 5: Today's most-read stories

1. How to solve Windows system crashes in minutes
<http://www.networkworld.com/nltechupdate7691>
2. Verizon CTO lays out next-gen network plans
<http://www.networkworld.com/nltechupdate7993>
3. McAfee, Omniquad top anti-spyware test
<http://www.networkworld.com/nltechupdate6919>
4. Digging out new rootkits
<http://www.networkworld.com/nltechupdate7994>
5. Skype: Hazardous to network health?
<http://www.networkworld.com/nltechupdate7844>

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To contact:

Day is chief scientist for Riverbed Technology. He can be
reached at mday@riverbed.com
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