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

Transport Optional Upgrade Release Transition Release Notes
Announcement
10
Automatic Tunneling using IPv4-Compatible Addresses is Obsoleted This feature
was introduced in TOUR 2.0.
Automatic Tunneling using the special IPv6 address type known as "IPv4-compatible
address" is no longer supported. The IETF has deprecated this mechanism in favor of the
generic automatic tunneling mechanism known as "6to4."
Optimized TCP Retransmit Algorithm This feature was introduced in TOUR 2.2.
The previous TCP retransmit algorithm based on RFC 2582 retransmitted more data than
necessary. The transition patch PHNE_35351 (for HP-UX 11i v1) implements RFC 3782, a
more optimal TCP retransmit algorithm.
Optimized Loss Recovery following RTO This feature was introduced in TOUR 2.2.
The transition patch PHNE_35351 (for HP-UX 11i v1) implements RFC 3517 to reduce the
number of packets retransmitted during the loss recovery phase following the RTO.
Modified Range for ip_strong_es_model This feature was introduced in TOUR 2.4.
The transition patch PHNE_35351 (for HP-UX 11i v1) modifies the acceptable range of values
for ip_strong_es_model to 0 through 2. The ndd help text has been updated to document the
support for the new value.
Default Gateway for each Physical IPv4 Interface This feature was introduced in
TOUR 2.4.
The transition patch PHNE_35351 (for HP-UX 11i v1) enables you to configure per-interface
defaults gateway for each IPv4 interface, instead of a single default IPv4 gateway for all
interfaces,. This feature is by default disabled in the HP-UX 11i v1 Transport software. When
this feature is disabled, the interface functions as on the base (unpatched) HP-UX 11i v1
Transport release.
When the per-interface default gateway feature is enabled, IP will send an outbound packet
using the interface for the IPv4 address to which the sending socket (or communication
endpoint) is bound. If the sending socket (or communication endpoint) is not bound to a
specific address, IP will send the packet using the interface on which the inbound packet was
received.
If the per-interface default gateway feature is not enabled and a system has multiple physical
interfaces connected to the same subnet, IP sends all outbound packets to that subnet using
the same interface (the single default interface).