Transport Optional Upgrade Release (TOUR) 3.0 Release Notes

What Is New in This Version

TOUR 3.0 includes the following:

• HP-UX Transport Enhancements

— NOSYNC Support: TOUR 3.0 supports the STREAMS NOSYNC feature that

enables handling of multiple requests arriving on the same queue.

— Forward-Retransmission Timeout (F-RTO): An enhancement to the TCP

retransmission algorithm. The algorithm is designed to effectively deal with spurious

timeouts.

— Dynamic keying support for HP-UX Mobile IPv6 A.01.01 and HP-UX IPSec:

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.

— Enhanced route command: The route command can be used to specify an interface

for a route.

— Congestion window validation: An enhancement to support RFC 2861 for better

estimation of the available capacity as represented by the TCP congestion window.

— Internal TCP and UDP Enhancements: Enhancements to improve TCP/IP

scalability and performance.

• HP-UX STREAMS Enhancement

TOUR 3.0 includes the NOSYNC feature. NOSYNC is a new STREAMS synchronization

feature that enables components such as I/O drivers to increase networking I/O

bandwidth for high speed links such as multi-port APA and 10Gigabit cards.

• Previous TOUR Bundle Features and Functionalities

HP-UX Transport Enhancements

This section provides a summary of the HP-UX transport enhancements included in TOUR

3.0.

NOSYNC Support

In previous releases of the TCP/IP stack, the IP module had to serially handle multiple

requests arriving on the same queue. The NOSYNC feature, a new STREAMS

synchronization level, has removed this restriction and allows the IP module to handle