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

Conﬁguration

Host Names and IPv6 Addresses

Chapter 324

3ffe:ffff:101::230:6eff:fe04:d9ff host3 host3.site2.region4

192.1.2.34 hpfcrm loghost

NOTE HP-UX 11i IPv6 bundled as part of TOUR 1.0 is a dual stack

implementation. A single host name can have entries for both an IPv6

address and an IPv4 address in /etc/hosts.

Name and Address Lookup for IPv6

/etc/nsswitch.conf (nsswitch.conf(4)) is a conﬁguration ﬁle for the

name service switch. A new entity, ipnodes, speciﬁes which name

services resolve IPv4 and IPv6 addresses and host names on HP-UX 11i

IPv6 bundled as part of TOUR 1.0.

More speciﬁcally, the new keyword “ipnodes” speciﬁes the resolver

policy for the new library functions getnameinfo(3N),

getaddrinfo(3N), getipnodebyname(3N) and getipnodebyaddr(3N)

for both IPv4and IPv6 addresses. The existing keyword “hosts” speciﬁes

the resolver policy for the library functions gethostbyname() and

gethostbyaddr() for IPv4 addresses.

NOTE Internet Services applications (such as telnet, r* commands, etc.) use

these new library functions to resolve IPv4 and IPv6 addresses.

By default, the /etc/nsswitch.conf is not on the system. The default

ipnodes policy (same as default hosts policy) is as follows:

dns [NOTFOUND=return] files

This policy implies that dns is the authoritative resolver and will only

try files if dns is down. If dns is available but returns NOTFOUND, the

search stops.

Thus, if DNS has not been set up as the deﬁnitive source, and ﬁles

(/etc/hosts) may need to be used for address and host name resolution,

HP recommends adding the following entry to /etc/nsswitch.conf:

ipnodes: dns [NOTFOUND=continue] files