TOUR Transition Release Notes (September 2004)(11i v2)

Transport Optional Upgrade Release Transition Release Notes

Announcement

The estimate of the available network capacity is reflected by the congestion validation

window. Previously, this estimation becomes less accurate over time. This happens when the

capacity that was previously used by a network-limited connection is used by other traffic.

Thus the most recent knowledge of the TCP connection, regarding the state of the network

path, is not reflected when the sender is application limited.

The transition patch PHNE_35765 (for HP-UX 11i v2 September 2004) implements

Congestion window validation according to RFC 2861. The capacity reflected by the

congestion window is more accurate due to the following modifications:

• TCP's congestion control algorithm decays the congestion window cwnd after transitioning

from a sufficiently long application-limited period while using the slow-start threshold

ssthresh to save the previous value of the congestion window.

• An application-limited TCP sender that has not fully used the current congestion window,

does not increase the congestion window.

Internal TCP and UDP Enhancements This feature was introduced in TOUR 3.0.

The transition patch PHNE_35765 (for HP-UX 11i v2 September 2004) contains

enhancements that modify some of the internal behavior of TCP and UDP. This results in

improved network scalability, especially for high end Non-Uniform Memory Access (NUMA)

systems and under heavy load conditions.

Dynamic keying support for MIPv6 A.02.01 (or later) with IPSec A.02.01 (or later)

This feature was introduced in TOUR 3.0.

The transition patch PHNE_35765 (for HP-UX 11i v2 September 2004) includes an

enhancement that enables dynamic negotiation of IPSec keys using the Internet Key

Exchange (IKE) v1 protocol on HP-UX 11i v2 September 2004 release. Refer to the HP-UX

Mobile IPv6 Release Notes at http://docs.hp.com/en/netcom.html#Mobile%20IP for more

details.