Transport Optional Upgrade Release (TOUR) 2.0 Release Notes (April 2004)

Transport Optional Upgrade Release (TOUR) 2.0 Release Notes
What Is in This Version
6
• netstat Enhanced to Support the Display of 64-bit MIB Counters: netstat in
TOUR 2.0 has been enhanced to support the display of 64-bit MIB (Management
Information Base) counters. Thus, some of the netstat fields have the potential to display
widened output. This can cause a wraparound effect on 80-character displays.
• Multicast Listener Discovery (MLD) Support (Host Portion Only): The host part of
Multicast Listener Discovery (MLD) protocol for IPv6 based on RFC 2710 “Multicast
Listener Discovery (MLD) for IPv6”, is supported. MLD is automatically enabled when an
IPv6 interface is initialized. The Management Information Base for MLD, based on RFC
3019, is also supported.
RFC 2710 specifies the protocol used by an IPv6 router to discover the presence of
multicast listeners (that is, nodes wishing to receive multicast packets) on its directly
attached links, and to discover specifically, which multicast addresses are of interest to
those neighboring nodes. This protocol is referred to as Multicast Listener Discovery or
MLD. MLD is derived from version 2 of IPv4’s Internet Group Management Protocol,
IGMPv2. One important difference to note is that MLD uses ICMPv6 (IP Protocol 58)
message types, rather than IGMP (IP Protocol 2) message types.
For more MLD information refer to RFC 2710, “Multicast Listener Discovery (MLD) for
IPv6”.
• Router Advertisement: Router Functionality as specified in RFC 2461 “Neighbor
Discovery for IP Version 6 (IPv6)”, is implemented with a daemon, rtradvd, and an
accompanying configuration file, /etc/rtradvd.conf. The rtradvd daemon listens to
router solicitation and sends router advertisement messages on demand or periodically
(as described in RFC 2461). These advertisements allow any listening host to configure
their addresses and some other parameters automatically without manual intervention.
They can also choose a default router based on these advertisements
Router advertisement is configured on a per interface basis. Refer to the
rtradvd.conf(4) man page for more information.
• IPv6 Transition Mechanisms Enhancements: TOUR 2.0 provides several IPv6
transition mechanism changes from those previously offered. Highlights of these changes
are provided below. There have been no changes to the dual-stack mechanism, but several
important changes to the tunneling mechanisms. The following RFCs are supported in
TOUR 2.0 (the IETF documents listed below are available at http://www.ietf.org):
RFC 2473 - Packet Tunneling in IPv6
RFC 2893 - Transition Mechanisms for IPv6 Hosts and Routers
RFC 3056 - Connection of IPv6 Domains via IPv4 Clouds