HP-UX IPv6 Transport Administrator's Guide for TOUR 1.0

Features Overview

IPv6 Transport (bundled as part of TOUR 1.0)

Chapter 14

neighboring nodes. This protocol is referred to as Multicast Listener

Discovery or MLD. MLD is derived from version 2 of IPv4’s

InternetGroup 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 new 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.

• FDDI Link Support.

• MC/SG Enablement.

Additional HP-UX 11i IPv6 Transport Features

The following IPv6 transport features are also available as part of TOUR

1.0 (and have been since the ﬁrst HP-UX 11i IPv6 product was

available):

• IPv4/IPv6 Dual Stack: HP-UX 11i IPv6 supports both IPv4 and IPv6

applications. Programmers can write IPv6 applications that

communicate with both IPv6 and IPv4 peers. Existing IPv4

applications do not need to be modiﬁed.

• Tunneling: IPv6 tunneling enables IPv6/IPv4 hosts and routers to

connect with other IPv6/IPv4 hosts and routers over the existing

IPv4 network. IPv6 tunneling encapsulates IPv6 datagrams within

IPv4 packets. The encapsulated packets travel across an IPv4

infrastructure until they reach their destination host or router. The

IPv6-aware host or router decapsulates the IPv6 datagrams,