Specifications

IPv6
Description
'IPV6_AUTOCONF = No' for/etc/sysconfig/network-scripts/ifcfg-<nicName>is not being
honored on reboot or boot
On boot, a stateless, auto-configured IPv6 address is assigned to the network interface. If a comm
path is created with a stateless IPv6 address of an interface that hasIPV6_AUTOCONF=Noset,
the address will be removed if any system resources manage the interface, e.g.ifdown
<nicName>;ifup <nicName>.
Comm path using auto-configured IPv6 addresses did not recover and remained dead after
rebooting primary server becauseIPV6_AUTOCONFwas set toNo.
Solution: Use Static IPv6 addresses only. The use of auto-configured IPv6 addresses could
cause a comm loss after a reboot, change NIC, etc.
While IPv6 auto-configured addresses may be used for comm path creation, it isincumbent upon
the system administrator to be aware of the followingconditions:
l IPv6 auto-configured/stateless addresses are dependent on the networkinterface (NIC)
MAC address. If a comm path was created and the associated NICis later replaced, the
auto-configured IPv6 address will be differentandLifeKeeper will correctly show the comm
path is dead. The comm path will needto be recreated.
l At least with RHEL5.6, implementing the intended behavior for assuringconsistent IPv6
auto-configuration during all phases of host operation requiresspecific domain knowledge
for accurately and precisely setting the individualinterface config files AS WELL AS
thesysctl.conf, net.ipv6.*directives(i.e. explicity settingIPV6_AUTOCONFin theifcfg-
<nic>which is referenced by the'if/ip'utilities AND setting directives
in/etc/sysctl.confwhich impact NICcontrol when the system is booting and switching init
levels).
IP: Modify Source Address Setting for IPv6 doesn't set source address
When attempting to set the source address for an IPv6 IP resource, it will report success when
nothing was changed.
Workaround: Currently no workaround is available. This will be addressed in a future release.
IP: Invalid IPv6 addressing allowed in IP resource creation
Entering IPv6 addresses of the format2001:5c0:110e:3368:000000:000000001:61:14is accepted
when the octets contain more than four characters.
Workaround: Enter correctly formatted IPv6 addresses.
Can't connect to host via IPv6 addressing
lkGUIappwill fail connecting to a host via IPv6 hex addressing, either via resolvable host name or
IP address. lkGUIapp requires an IPv4 configured node for connection. IPv6 comm paths are fully
supported.
236Troubleshooting