TOUR Transition Release Notes (September 2004)(11i v1 and 11i v2)

Transport Optional Upgrade Release Transition Release Notes
Announcement
11
The ndd parameter ip_strong_es_model determines if the per-interface default gateway
feature is enabled in addition to the strong end-system (SES) model. When the strong
end-system model is enabled, packet source addresses (and therefore interfaces on a
multihomed host) affect selection of a gateway for outbound packets. Previously,
ip_strong_es_model supported two values 0 and 1.
A value of 0 for ip_strong_es_model is also the default value in base HP-UX systems when
the default gateway feature is disabled for a physical IPv4 interface.
The valid values for ip_strong_es_model are as follows:
• 0: Disable the strong end-system model. The interface functions as it does on base
(un-patched) HP-UX 11i v1 systems. This is the default value
• 1: The strong end-system model is enabled on the system, but the per-interface default
gateway feature is disabled
• 2: The strong end-system model and the per-interface default gateway feature are enabled
on the system
The ip_strong_es_model parameter now supports another value that is 2. If you set
ip_strong_es_model to 2, the system attempts to match the best gateway (discussed in Case
1) when multiple default gateways are set up on a single IPv4 subnet. Following are different
instances that affect the routing decision:
• Case 1: If the client application is bound to the IP source address, the default gateway
chosen is the one associated to that source address
• Case 2: If the client application is bound to INADDR_ANY, the default gateway chosen is the
one associated to the source address the client application binds to
New Parameter for the ifconfig Command This feature was introduced in TOUR 2.4.
The transition patch PHNE_35351 (for HP-UX 11i v1) adds a new parameter forward to the
ifconfig command. The parameter forward allows IP forwarding functionality to be enabled
or disabled for individual interfaces.
NOSYNC Support This feature was introduced in TOUR 3.0.
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, removes this restriction and enables the IP module to handle requests
simultaneously. The transition patches PHNE_35351 (for HP-UX 11i v1) and PHNE_35765
(for HP-UX 11i v2 September 2004) improve network throughput for high speed network
interfaces such as multi-port Gigabit cards in an Auto Port Aggregation (APA) configuration
or 10Gigabit cards.